Author Topic: Smiths Chrono Parts Numbers for BSA Twins?  (Read 408 times)

Offline Peter Gee

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Smiths Chrono Parts Numbers for BSA Twins?
« on: 03.09. 2018 06:25 »
Hi, anyoneknow what part numbers I should be looking for in the box of Smiths "got from who knows where" chrono speedos?

My bike is a 59 A7SS...but what's the general Smith's numbering for BSA types?

Thanks

Offline KiwiGF

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Re: Smiths Chrono Parts Numbers for BSA Twins?
« Reply #1 on: 03.09. 2018 07:16 »
Hi, anyoneknow what part numbers I should be looking for in the box of Smiths "got from who knows where" chrono speedos?

My bike is a 59 A7SS...but what's the general Smith's numbering for BSA types?

Thanks

Many owners get any old chronometric and specify the wheel revs per mile required to an expert restorer of speedos, who then adjusts it so it reads accurately for your bike, so pretty much any speedo will do as a starting point.

If it’s originality you are after (correct part number on dial) a speedo restorer should be able to supply a new dial face with whatever number you want.

Note this does mean there is a possibility any number on a speedo dial is not necessarily a true representation on what is inside the speedo!

Note your required revs per mile will not be std if your final gearing is non std.

I’m pretty sure the info on part numbers for each bike year is already on this forum.

Edit: here’s one thread with info. My 56 gf has sc3305 and (more importantly) 1440 revs per mile https://www.a7a10.net/forum/index.php/topic,701.msg4399.html#msg4399
New Zealand

1956 A10 Golden Flash  (1st finished project)
1949 B31 rigid “400cc”  (2nd finished project)
1968 B44 Victor Special (3rd finished project)
2001 GL1800 Goldwing, well, the wife likes it
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Online JulianS

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Re: Smiths Chrono Parts Numbers for BSA Twins?
« Reply #2 on: 03.09. 2018 09:14 »
Page below from 1959 Smiths catalogue, column after model is MPH speedo the next is KPH version.