The BSA A7-A10 Forum

Technical => Frame => Topic started by: gpo746 on 01.11. 2017 19:59

Title: Indian "Smiths Chronometric" Speedometers
Post by: gpo746 on 01.11. 2017 19:59
I cannot afford £300+ for a genuine Chronometric speedo , so I was wondering if these replicas would work on an STD gearbox . I believe the ratio is 2:1 .
http://www.ebay.co.uk/itm/SPEEDOMETER-SPEEDO-80-MPH-REPLICA-SMITHS-ROYAL-ENFIELD-80MM-FACE-DIA-AEs/362133403475?hash=item5450d53753:g:eS8AAOSwzJ5XWn4v
I have and use one already on my Royal Enfield Bullet but that is front wheel driven . Personally , I would rather spend £300+ on a decent Ignition and charging system than a chronometric . Has anyone done this ?
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: JulianS on 01.11. 2017 20:33
The problem is finding out what will work accurately with your bike. 2;1 is OK for a tachometer but does not tell you whether or not a speedometer will work satisfactorily on you bike.

There are many different setups/calibrations  with the chronometrics we use and 2;1 is too simple!
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Dean on 01.11. 2017 21:15
I couldn't justify/afford £3-400 for a Smiths speedo for my bitsa so blew £15 on a bicycle sppedo. Dead easy to fit, far more accurate than a Smiths and it tells you the time. The only downside is discovering by how much the Smiths flatters your bike's speed!

So, you could fit a cheaper Indian for the looks but not bother hooking it up and fit a bicycle speedo for actual speed measurement.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Black Sheep on 01.11. 2017 21:50
Look out for a Smiths magnetic one. Much cheaper.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: gpo746 on 01.11. 2017 22:14
Look out for a Smiths magnetic one. Much cheaper.
The Indian replicas are dead cheap at under £20 but do the Smiths magnetic type have the same shell/fittings/face etc?.  The only magnetic ones I have come across are the tiny wee Bantam ones or the huge mini/morris minor types .
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: gpo746 on 01.11. 2017 22:18
I couldn't justify/afford £3-400 for a Smiths speedo for my bitsa so blew £15 on a bicycle sppedo. Dead easy to fit, far more accurate than a Smiths and it tells you the time. The only downside is discovering by how much the Smiths flatters your bike's speed!

So, you could fit a cheaper Indian for the looks but not bother hooking it up and fit a bicycle speedo for actual speed measurement.

Yes, my pal did that with a 1942 WLA45 Harley Chop ...unfortunately , he was using A10 STD 'boxes and binned a couple when the bushes went every year or so.... in the days when you could pick a A10 box up for £20..
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Bsareg on 01.11. 2017 23:59
I've  tried the Indian "replicas" twice. The first had the correct connector of 12mm with 1mm pitch, but required an inner cable with 2.4mm square, so went back. The second had the correct inner of 1/8" square but a much larger and longer connector with a coarse thread . Both seemed to work smoothly and looked  fair copies, even had made in England on dials !!  I'm  convinced that the correct combination is there somewhere, so will keep trying.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Brian on 02.11. 2017 04:40
What about a GPS one something like this

https://www.ebay.com.au/itm/85MM-200KM-H-Car-Boat-Gauge-Trim-Analog-GPS-Speedometer-Digital-Odometer-Red-LED-/112556169250?_trksid=p2385738.m2548.l4275

You do need 12v though but a lot of us have converted our bikes to 12v

Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Black Sheep on 02.11. 2017 06:40
Smiths magnetic clocks were a direct replacement for expensive chronometrics on all British bikes. Look as A65s, 650 Nortons etc. So they are out there and do fit. And they are cheap.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Butch (cb) on 02.11. 2017 08:44
... so blew £15 on a bicycle sppedo. Dead easy to fit, far more accurate than a Smiths and it tells you the time. The only downside is discovering by how much the Smiths flatters your bike's speed!


Yeah, I had one fitted to my Sportster for a while. I was quite surprised to find (on private land obviously) that there was in fact a third digit for when you exceeded 100 mph. Now why would you need that on a a bicycle?
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: duTch on 02.11. 2017 08:54
 
Quote
I couldn't justify/afford £3-400 for a Smiths speedo for my bitsa so blew £15 on a bicycle sppedo. Dead easy to fit, far more accurate than a Smiths and it tells you the time. The only downside is discovering by how much the Smiths flatters your bike's speed

 I did this when my cable was busted again on the Gutzzi mid-return trip from Melbourne...tried a few different ones after and worked fine but high attrition rate for different reasons, but ran analogue type ones (magnet on spoke) and one on each bike......

 Then I used a Garmin GPS one which was ok  and can swap between bikes, but also went to gps in the sky...been using a Bryton edge100 (I think) and works good, and also able to swap between bikes, even though both bikes speedos work fine and in mph one reads high and one reads low, so I average them (and the GPS Bryton is set in Kph) keeps me on my toes.

 * got pulled over by the law on last Sunday out of town and he didn't arrest me so couldn't have been too bad *smile*

 Rounded up by CB....;
 
Quote
Yeah, I had one fitted to my Sportster for a while. I was quite surprised to find (on private land obviously) that there was in fact a third digit for when you exceeded 100 mph. Now why would you need that on a a bicycle?

   *conf* 'Cos some people peddle faster than ... *dunno*

 
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Rex on 02.11. 2017 09:05
The Indian-made speedos are exactly what you'd expect for twenty quid delivered to your door, and look exactly right...from about ten yards away! The connector is incorrect, although JJ Cables (I believe) make suitable cables with the correct ends.
They also are not a direct replacement in many applications as being magnetic speedos the cable entry is central on the base, whereas the Chrono is off-set to the side. The case is also deeper on the Indian copies.
Some say they fail by the end of the street while others report a year's use before failing.
Basically cheap tat. *sad2*
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Sluggo on 02.11. 2017 09:44
Some of those Indian made ones are quite an attractive price, I have not tried many of them but for a while worked for a shop that was an Enfield dealer so they seemed to work okay but I have no idea those sold online are the same as fitted to Enfield bikes. 

But heres my takeaway... MOST of those wont look right on a British bike like an A10 or BSA preunit single.
The reason is on a enfield they have what is called a Casquet or Nacelle so its hidden when installed except the face.  Notice in the picture they dont show a side or rear side view?  So, I have seen a few people use them (And matching tachs) and installed them in cup like holders (Similar to A65, or OIF rubber cups, or Norton  Commando type mounts that cover up the sides and back.  So if you dont mind some fab work and creative work at it, they wont look right

#2) Many (Not all, but most) have metric threads and the mounts are metric as well as the cable housing threads so that is manageable but not easily solved.

So, that type do look rather cool and good prices, cant say how they hold up.  But not exactly an easy swap and not look like bodgering.

All is not lost however, while noted, the later Smiths magnetic instruments are out there and cost less than the chronos, but they are not cheap nor are they inexpensive to overhaul and while a simpler design (The Chronos are like a swiss watch inside, but the magnetics are much simpler) they are not all that durable or easy to match up with the wide range of gear ratios and drives.

But there is a variety of repop instruments at very attractive prices and in the past there was a variety of them made..  Ill post some pictures if you like of some of them,  But the old US distributor "Domiracer" and accyMart (Same place, Dommi was for shops and dealers the AM was the retail side) made their own repops and I liked them, I bought around 30-40 sets back in the day and had many happy customers, I have 2 pairs left-1 used and 1 new in box I am saving for specific projects.  Dommiracer went out of business a couple years ago and I mourn their loss.

There is some other company(s) making repops now and in the last 10 years I have ordered quite a few sets and the prices were great, and they had 2 styles,  Good knock offs of the magnetic models they had black face and grey face versions,, and I understand they make some now with Chronometric style faces but are magenetic internally.  In the last 15 years I had only one customer who had a failure and I am still not clear what the problem was... Instrument or owner?  But I have some here and can take some pictures for you.

Then there is a guy based out of Utah and he races a Norton and seems to be a promoter or operator of the road racing facility in Utah.  I have met him at some of the Norton rallys and he is the US distributor of the modern Smiths instruments and they seem well made, durable and good quality.  I have heard positive reviews and nothing negative except the price.

Tom killen??  I have his business card in my office,,  If you are in the UK there is a UK dealer.  But this guy is the US rep,, 
See his website,, http://smithsgaugesusa.com/

I have looked them over extensively and cannot find fault with them, But I have not personally bought or used any of his.

** I cant find my grey face repops at the moment (Went and looked) but here is some others..

Some instruments with TRIUMPH logo. Not sure if those are repops are some sort of mid 70s factory triumph instruments (Anyone know) 

Some of the Domiracer instruments,

Some NOS Chronos,, old dealer stock. Some of them were for police bikes and have certificates of accuracy presumably for court cases?  (Oh! the irony!)  Sorry, Not for sale

Set of generic repops on a 67 Triumph twin in my shop,,

Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: gpo746 on 02.11. 2017 10:15
Some of those Indian made ones are quite an attractive price, I have not tried many of them but for a while worked for a shop that was an Enfield dealer so they seemed to work okay but I have no idea those sold online are the same as fitted to Enfield bikes. 

But heres my takeaway... MOST of those wont look right on a British bike like an A10 or BSA preunit single.
The reason is on a enfield they have what is called a Casquet or Nacelle so its hidden when installed except the face.  Notice in the picture they dont show a side or rear side view?  So, I have seen a few people use them (And matching tachs) and installed them in cup like holders (Similar to A65, or OIF rubber cups, or Norton  Commando type mounts that cover up the sides and back.  So if you dont mind some fab work and creative work at it, they wont look right

#2) Many (Not all, but most) have metric threads and the mounts are metric as well as the cable housing threads so that is manageable but not easily solved.

So, that type do look rather cool and good prices, cant say how they hold up.  But not exactly an easy swap and not look like bodgering.

All is not lost however, while noted, the later Smiths magnetic instruments are out there and cost less than the chronos, but they are not cheap nor are they inexpensive to overhaul and while a simpler design (The Chronos are like a swiss watch inside, but the magnetics are much simpler) they are not all that durable or easy to match up with the wide range of gear ratios and drives.

But there is a variety of repop instruments at very attractive prices and in the past there was a variety of them made..  Ill post some pictures if you like of some of them,  But the old US distributor "Domiracer" and accyMart (Same place, Dommi was for shops and dealers the AM was the retail side) made their own repops and I liked them, I bought around 30-40 sets back in the day and had many happy customers, I have 2 pairs left-1 used and 1 new in box I am saving for specific projects.  Dommiracer went out of business a couple years ago and I mourn their loss.

There is some other company(s) making repops now and in the last 10 years I have ordered quite a few sets and the prices were great, and they had 2 styles,  Good knock offs of the magnetic models they had black face and grey face versions,, and I understand they make some now with Chronometric style faces but are magenetic internally.  In the last 15 years I had only one customer who had a failure and I am still not clear what the problem was... Instrument or owner?  But I have some here and can take some pictures for you.

Then there is a guy based out of Utah and he races a Norton and seems to be a promoter or operator of the road racing facility in Utah.  I have met him at some of the Norton rallys and he is the US distributor of the modern Smiths instruments and they seem well made, durable and good quality.  I have heard positive reviews and nothing negative except the price.

Tom killen??  I have his business card in my office,,  If you are in the UK there is a UK dealer.  But this guy is the US rep,, 
See his website,, http://smithsgaugesusa.com/

I have looked them over extensively and cannot find fault with them, But I have not personally bought or used any of his.

** I cant find my grey face repops at the moment (Went and looked) but here is some others..

Some instruments with TRIUMPH logo. Not sure if those are repops are some sort of mid 70s factory triumph instruments (Anyone know) 

Some of the Domiracer instruments,

Some NOS Chronos,, old dealer stock. Some of them were for police bikes and have certificates of accuracy presumably for court cases?  (Oh! the irony!)  Sorry, Not for sale

Set of generic repops on a 67 Triumph twin in my shop,,

Nice sets of clocks you have there !. Looked at The Smiths site link you gave and the prices are not that far off buying a S/H original after taxes , shipping and import duties they will be more than buying a recon original . I really want to keep the costs down on the speedo. Now, Where it comes to cables I will have to make my own up I think.
Even though my bike is a '54 I will be using the later nacelle so all will be hidden .
I may end up using an indian one and comparing it side by side with a GPS system ... or the good old way of getting a mate to follow me and I give him the thumbs up when my speedo hits 30mph and he records what his car is doing..crude as hell but does give an indication of where you are ....sort of !  *smile*
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Topdad on 02.11. 2017 11:09
"yrs ago I bought an indian replica ,cost £22 inc post . I had to get the cable changed by Verhill engs (royal enfield size screw onto speedo ) for about a tenner and it's worked really well and appears to be fairly accurate . It has a green insert which does look a little strange around the inside of the glass but could be changed ,i couldn't afford the silly money for an original and thought what the hell. Also customer service was great first instrument came was kilometeres I expected a get lost from the supplier in India when I asked for a english version instead I rec'd a replacement within days ,so I am a happy bunny and unless a total rivet counter is around noone seems to notice !
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: BSA_54A10 on 02.11. 2017 12:14
Bike speedos work really well with the only exception that they are made for healthy young eyes to look at so the black digits on a grey background can be a touch hard to see.
The LCD displays will just turn black if they get too hot and while thy will revert when cooler it is a good idea to pop something over them if they are going to be left in the sunlight for extended periods.
While you are there, a Tiny Tach will add a tacho & hour meter, again with small numerals but dead easy to fit and about £ 20 a steal.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Topdad on 02.11. 2017 12:57
Proir to fitting the Indian speedo i was using a magnetic one, was 20 5 at to fast and no way as stable I've got it on a shelf if you like to try it ?
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Sluggo on 02.11. 2017 18:46
I had not considered you might have a nacelle (BSA type) but if thats the case, and you are on a budget then at that price point (And assuming you can get a cable to fit) then I would consider rolling the dice on one of the Indian ones.

I have a friend in India and he claims he was the leading manufacturer of replica instruments and some years back others noticed he was successful and started making their own.  He gave up on making them as the market got flooded so my belief is its just hard to figure out which are a decent quality and which are not.

But as I said, and failed to properly illustrate, is that some really nice looking (And performing) replicas are being made now.  I have a grey face and a black face set somewhere in storage still in boxs I bought for some projects where original is not important.  I get them wholesale and am not going to post the prices here but the retail on them is very affordable and like I said, I sell a fair number of them over the years and no complaints.  The ones on the Triumph  I took a picture of were an earlier version and those were fitted about 10 years ago and were owned by an old guy who puttered about but not extensive mileage (I bought the bike back from him when his health was failing)

Here is a picture of the current repops,, I understand there is some with a Chrono style face but internally are magnetic.   See: http://jrcengineering.com/product/ssm500106/

This is the tacho (Again grey face) See: http://jrcengineering.com/product/rsm300301/

I rarely deal with the public as a shop anymore (No thank you!  *countdown*) But I still have most of my dealer accts.  So, seeing as you are in the UK I dont think its practical to try and peddle you any parts, and these are readily available thru a variety of UK based dealers.

But as a shop it used to annoy the heck out of me how many calls I used to get asking for "A decent used set of instruments" or "Used speedo drive".  Nobody wanted to pay the cost of new replacements and so when these replicas came out, It was a good option for those who did not want to pay the cost for new or rebuilt originals.  Lots of people wanted to swap out their rusty rims for a "Nice used set with good chrome" as well.   *problem*  So Cheap Basta........ Oops, I mean economy conscious consumers  I feel your pain but
it made it hard to run a business.   

heres a set on US ebay of Chrono replicas (Speedo and tach) and if fitted in some sort of cups they look pretty good but as I said, from the side or back they look like cheap knock offs..(but for a bitsa custom who cares if you can cover up the ugly part?) These are located IN the UK --seller
See: https://www.ebay.com/itm/Matching-Chronometric-120-Mph-Speedometer-And-Revcounter-Smiths-Replica-Items/112515524760?hash=item1a3272a898:g:aIUAAOSwtPhZiYr0&vxp=mtr

Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Rex on 02.11. 2017 20:31
The speedo is identical to the twenty quid items seen all over Ebay.
The "UK seller" is just a postal address or agent for the Indian maker. They do fit in A10 nacelles even with the added depth of the case.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: gpo746 on 02.11. 2017 22:10
I had not considered you might have a nacelle (BSA type) but if thats the case, and you are on a budget then at that price point (And assuming you can get a cable to fit) then I would consider rolling the dice on one of the Indian ones.

I have a friend in India and he claims he was the leading manufacturer of replica instruments and some years back others noticed he was successful and started making their own.  He gave up on making them as the market got flooded so my belief is its just hard to figure out which are a decent quality and which are not.

But as I said, and failed to properly illustrate, is that some really nice looking (And performing) replicas are being made now.  I have a grey face and a black face set somewhere in storage still in boxs I bought for some projects where original is not important.  I get them wholesale and am not going to post the prices here but the retail on them is very affordable and like I said, I sell a fair number of them over the years and no complaints.  The ones on the Triumph  I took a picture of were an earlier version and those were fitted about 10 years ago and were owned by an old guy who puttered about but not extensive mileage (I bought the bike back from him when his health was failing)

Here is a picture of the current repops,, I understand there is some with a Chrono style face but internally are magnetic.   See: http://jrcengineering.com/product/ssm500106/

This is the tacho (Again grey face) See: http://jrcengineering.com/product/rsm300301/

I rarely deal with the public as a shop anymore (No thank you!  *countdown*) But I still have most of my dealer accts.  So, seeing as you are in the UK I dont think its practical to try and peddle you any parts, and these are readily available thru a variety of UK based dealers.

But as a shop it used to annoy the heck out of me how many calls I used to get asking for "A decent used set of instruments" or "Used speedo drive".  Nobody wanted to pay the cost of new replacements and so when these replicas came out, It was a good option for those who did not want to pay the cost for new or rebuilt originals.  Lots of people wanted to swap out their rusty rims for a "Nice used set with good chrome" as well.   *problem*  So Cheap Basta........ Oops, I mean economy conscious consumers  I feel your pain but
it made it hard to run a business.   

heres a set on US ebay of Chrono replicas (Speedo and tach) and if fitted in some sort of cups they look pretty good but as I said, from the side or back they look like cheap knock offs..(but for a bitsa custom who cares if you can cover up the ugly part?) These are located IN the UK --seller
See: https://www.ebay.com/itm/Matching-Chronometric-120-Mph-Speedometer-And-Revcounter-Smiths-Replica-Items/112515524760?hash=item1a3272a898:g:aIUAAOSwtPhZiYr0&vxp=mtr

Hi Sluggo,
               Defo on a budget! . I have had the good grey faced repro's before for another bike I used to own . My main concern was getting the right ratio speedo to match the gearbox.I can make or buy a cable that is not an issue.  I know what you mean about dealing with the public !! ...nightmare! and yeah, my neighbour has just paid out for new spokes plus a used pitted rim and rebuild cost for his B31 ..there was only £50 difference in having a brand new chrome rim ...as I said I am on a budget ..not a bodget !.Strange thing is none of the ebay sellers list the ratio of the speedos. Someone said the gearbox was 1:83 to 1 , I dont know how accurate this is. I thank you for you input on this.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: gpo746 on 02.11. 2017 22:11
The speedo is identical to the twenty quid items seen all over Ebay.
The "UK seller" is just a postal address or agent for the Indian maker. They do fit in A10 nacelles even with the added depth of the case.
Hi Rex, thanks..It is nice to know that it will fit in the nacelle!
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Sluggo on 02.11. 2017 22:29
The ratio SHOULD be in the factory manual, have not looked it up on a A10, And wondering about the prunit single gearboxs as well as I have a few BSA Singles as well to deal with.

I DO know that BSA was the king of gearing ratios both in the box and primary and then to some degree final drive.  Trials, wide ratio, close ratio,  Then on the primaries as well. I have most of the service sheets and literature but its a lot of data to sort thru.

Be nice if all the gearbox speedo ratios were the same but I doubt it.   I like the speedo drives off the box for early Triumphs as well,, always has lube and far less problems than the rear wheel drive boxs they went to.   I have some smiths catalogs and literature as well If you cant find it.

Your inquiry was timely as I am in the midst of inventory and organizing and figuring what I got and dont and making up a "Wish List" is my long running current project.  So,, much of my speedo and tach stuff was accessible hence the pictures.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: JulianS on 03.11. 2017 08:41
The chronometric speedos usually have a figure on the face - 1450 on my A10 - which is the number of cable revs per mile to which it is calibrated. It is found just below the needle pivot.

On the A10, given standard rim and tyre, it depends on gearbox and rear wheel sprocket, sleeve gear and fixed layshaft gear tooth number and the speedo driving gear on layshaft and driven gear in gearbox cover.

It does not easily translate to a simple speedo head ratio so I think you are down to experimentation to see how well it works.

I have not seen a BSA service sheet or bulletin on this, Triumph were more helpful with the early unit 650 and explained it for their bikes on Tech Service Bulletin 11 if you have a copy.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: Greybeard on 03.11. 2017 09:27
It may be worth talking to Russel at Chronomentric Services, http://www.chronometrics.co.uk. He's very friendly and it's possible he may be able to help you. If nothing else he may be able to measure your speedo drive output so you know what to look for.

I got Russel to recalibrate my speedo after I changed the drive ratios on my bike. Unfortunatley this leaves the odometer innacurate but that's not really important.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: KiwiGF on 03.11. 2017 10:44
I had not considered you might have a nacelle (BSA type) but if thats the case, and you are on a budget then at that price point (And assuming you can get a cable to fit) then I would consider rolling the dice on one of the Indian ones.

I have a friend in India and he claims he was the leading manufacturer of replica instruments and some years back others noticed he was successful and started making their own.  He gave up on making them as the market got flooded so my belief is its just hard to figure out which are a decent quality and which are not.

But as I said, and failed to properly illustrate, is that some really nice looking (And performing) replicas are being made now.  I have a grey face and a black face set somewhere in storage still in boxs I bought for some projects where original is not important.  I get them wholesale and am not going to post the prices here but the retail on them is very affordable and like I said, I sell a fair number of them over the years and no complaints.  The ones on the Triumph  I took a picture of were an earlier version and those were fitted about 10 years ago and were owned by an old guy who puttered about but not extensive mileage (I bought the bike back from him when his health was failing)

Here is a picture of the current repops,, I understand there is some with a Chrono style face but internally are magnetic.   See: http://jrcengineering.com/product/ssm500106/

This is the tacho (Again grey face) See: http://jrcengineering.com/product/rsm300301/

I rarely deal with the public as a shop anymore (No thank you!  *countdown*) But I still have most of my dealer accts.  So, seeing as you are in the UK I dont think its practical to try and peddle you any parts, and these are readily available thru a variety of UK based dealers.

But as a shop it used to annoy the heck out of me how many calls I used to get asking for "A decent used set of instruments" or "Used speedo drive".  Nobody wanted to pay the cost of new replacements and so when these replicas came out, It was a good option for those who did not want to pay the cost for new or rebuilt originals.  Lots of people wanted to swap out their rusty rims for a "Nice used set with good chrome" as well.   *problem*  So Cheap Basta........ Oops, I mean economy conscious consumers  I feel your pain but
it made it hard to run a business.   

heres a set on US ebay of Chrono replicas (Speedo and tach) and if fitted in some sort of cups they look pretty good but as I said, from the side or back they look like cheap knock offs..(but for a bitsa custom who cares if you can cover up the ugly part?) These are located IN the UK --seller
See: https://www.ebay.com/itm/Matching-Chronometric-120-Mph-Speedometer-And-Revcounter-Smiths-Replica-Items/112515524760?hash=item1a3272a898:g:aIUAAOSwtPhZiYr0&vxp=mtr

Hi Sluggo,
               Defo on a budget! . I have had the good grey faced repro's before for another bike I used to own . My main concern was getting the right ratio speedo to match the gearbox.I can make or buy a cable that is not an issue.  I know what you mean about dealing with the public !! ...nightmare! and yeah, my neighbour has just paid out for new spokes plus a used pitted rim and rebuild cost for his B31 ..there was only £50 difference in having a brand new chrome rim ...as I said I am on a budget ..not a bodget !.Strange thing is none of the ebay sellers list the ratio of the speedos. Someone said the gearbox was 1:83 to 1 , I dont know how accurate this is. I thank you for you input on this.

From memory the 1.83 ratio is correct, also being 11 turns of the back wheel to 6 of the cable. This only gets changed if non std sprockets are used, which is why changing the engine sprocket is generally used to alter gearing. It's not hard to check this ratio.

The calc for the chronometric revs per mile figure is something like 5280/6.8 x 11/6 = 1420 revs per mile (approx)

Where 5280 is the number of feet in a mile
6.8 is the circumference in feet of a 19 inch wheel with 3.5 inch tyre (my estimate.....)

I think there are other threads with more accurate figures for wheel circumference than I've given.....I'm sure someone can give better figures!
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: RichardL on 03.11. 2017 19:07
Here's a post I made when I was a boy in knee pants. It includes arithmetic to determine what radius is needed between axle and ground for a "1440" speedo to read properly.

 https://www.a7a10.net/forum/index.php?topic=701.msg4399#msg4399

Richard L.
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: duTch on 03.11. 2017 21:00

 The speedo drive gears are different for RR,RRT, and RRT2 boxes, can't remember the teeth numbers but think is 10 & 7 (written down somewhere). the other boxes have the 11/6 ratio as ^above^ ( P#'s listed in the Haynes manual Page 70)..

 I used the make a mark on the wheel (@ valve stem is handy) and ground and roll the bike/wheels to determine the circumference ( I call rolling diameter and but did it in meters ), and then think I used Richards method ...
Title: Re: Indian "Smiths Chronometric" Speedometers
Post by: gpo746 on 04.11. 2017 11:06
Here's a post I made when I was a boy in knee pants. It includes arithmetic to determine what radius is needed between axle and ground for a "1440" speedo to read properly.

 https://www.a7a10.net/forum/index.php?topic=701.msg4399#msg4399

Richard L.

Hi Richard, thanks...where the a7 is concerned I am still in nappies !.