Author Topic: Dunlop K70 tyre life, only 3000 miles? What lasts better?  (Read 1237 times)

Online KiwiGF

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It's 6400 miles since I got my A10 GF on the road (with new k70 tyres), the first (standard) size k70 rear lasted about 2700 miles before getting below 1.5mm, the second is at the wear limit at 6400 miles, so I'm getting on average a bit over 3000 miles out if them. The tyres wears mostly in the centre and there is plenty of tread on the edges when the legal limit is reached (I obviously don't go scratching enough  *smile* ).

The first rear was run at below 25 psi, which is why I thought the low life was my fault, the second has been run at 28/30 psi.

The front still has plenty of tread.

Is this sort of life normal for a rear K70 on kiwi type roads? (Kiwi roads have a reputation for being rough on tyres).

If so I'm think of changing brands or tyre type as it's pretty obvious Dunlop are making too much money out of me!

There's not much choice of brands in NZ so I would be particularly interested in hearing where other kiwis are buying tyres. I used cycletread.co.nz last time, but they only have the k81 listed at 179 nzd as of this morning.  I need to get a new rear tyre quick, so I can get the bike tested in time for he national bsa rally this coming weekend  *help*

New Zealand

Last had an A10 in 1976, in 2011 it was time for my 2nd one.

1956 Flash Frame EA7-168x Eng. CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

B31 “hot rod” (yeah right)

Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why yet

Offline Peter in Aus

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Hi KiwiGF you story is the same as mine only getting about 3000Ml  out of the K70 on both my A7 & A10 so it is not just you, I have just fitted a Dunlop Roadmaster TT100 410 H 19 to my A7 and have another on it way for the A10 I hope these do a bit better! *doubt*
Peter

Busselton West Australia
49 A7 longstroke
58 A10  SA

Online KiwiGF

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Thanks Peter, I can remember the tt100 from my youth and way back then they had a reputation for only wearing in the middle of the the as they were "triangle" shaped for better grip when banked over so that's why I initially went for the k70, but as you have confirmed the life I'm getting from the k70 I won't get any more of those. They are cr_p.

I'm pretty sure the tt100 of today is not the same as 40 years ago, and anyway come to think of it, the k70 is only wearing in the middle......so a tt100 cannot be any worse I guess  *doubt*

Cycletreads may have the Avon road runner H in 410 x 19 at 229nzd, so it may come down the tt100 or Avon, but the tt100 is cheaper!













New Zealand

Last had an A10 in 1976, in 2011 it was time for my 2nd one.

1956 Flash Frame EA7-168x Eng. CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

B31 “hot rod” (yeah right)

Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why yet

Offline Tomcat

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Thats just under 5000 klms so about normal for a rear tyre.  Good on you for wearing out so many tyres!  *smile*
'48 A7 '59 SR '74 850 Commando TDM900

Online KiwiGF

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Thats just under 5000 klms so about normal for a rear tyre.  Good on you for wearing out so many tyres!  *smile*

 *problem* I was getting over 10,000km from rears on my Triumph street triple and that had over 100hp! Having said that I can understand Dunlop won't be making as many k70's as modern tyres, and they are much narrower tyres of course, and lower tech, so I can only expect 5000km from other so called classic tyres? There's nothing better than a k70?

Edit: to put this in perspective, the fuel cost of doing 3000 miles is circa 500 nzd, so I'm spending half as much on tyres as I do on fuel  per mile covered *problem* *help* *dunno* *doubt*

New Zealand

Last had an A10 in 1976, in 2011 it was time for my 2nd one.

1956 Flash Frame EA7-168x Eng. CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

B31 “hot rod” (yeah right)

Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why yet

Online Triton Thrasher

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TT100, Avon SM, Avon Roadrunner, Avon Roadrider and just about anything else you can find, all last longer than K70.

Offline BSA_54A10

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Dunlop make tyres in different countries with different compounds to suit the local climate.
The Japanes Dunlops just never wore, black concrete.
The French or Irish Dunlops were used by Historic racers because they were a lot softer & sticker compounds.
Now days what ends up down here is pot luck
Bike Beesa
Trevor

Online bsa-bill

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Good on you for wearing out so many tyres!

My thoughts also, at the moment my tyres crack up before wearing out
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online duTch

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 I have a Avon Road Runner that I fitted circa '79- but it only did <2k miles still plenty tread but also a bit cracked, Michelin something on the front- same story but they still hold air fairly good.

 Happy to say though that the Metzler Enduro 1 & 2 I now have on have done circa 9k miles and getting down a bit- reckon I'll get anther thou or so.  Useless info to most though as they're 18 R & 21 F
 
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online cyclobutch

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Good on you for wearing out so many tyres!

My thoughts also, at the moment my tyres crack up before wearing out

Yeah, you guys must be riding like maniacs.
Various, including ...
'58 Iron Head Flash Bitza


Online bikerbob

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I have been using Mitas tyres for a number of years now with no problems, I have just been out and checked the tread depth on my A65 the tread depth is 4.6mm this tyre has done 3,200 miles. I have just fitted a brand new Mitas tyre to my A7 the tread depth is 5.4 mm. both measurements taken in the middle of the tread. I should add that the A65 tyre is on a 18" rim while the A7 is a 19" rim. I can't help but think that a good proportion of the cost for Dunlop and Avon tyres is you are paying for the name, I also do not ride either bike hard gave that up 50 years ago only costs money. These are both rear tyres.

Offline a101960

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bikerbob, it is interesting to read your comments about Mitas tyres, because I have a brand new Mitas 19 x 3.50 sat in my garage that I bought because the tread appeared to be a rounder profile than the Avon SM MK 2 that I was using. I did not fit the Mitas tyre however, because it looked far to narrow to be a 3.50. In my opinion it looked to be more suited to Bantam or C11 than to its claimed suitability for an A10. In stead I opted to fit another SM MK2. Despite the derogatory remarks expressed by many people about SM's (skidmasters etc) I have never had any cause to worry about their grip or road holding abilities. Like you I no longer race about. I got that out of my system many years ago, but having said that I don't dawdle either, and the SM's in my experience feel perfectly safe and sure footed no matter how far over I lean.

Online bikerbob

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Hi a101960   Just been out into the garage to measure both tyres. The A65 is 3.50 X 18  but the A7 is 3.33 X 19 so is narrower but it looks OK but the tread patterns are different.

Online mikeb

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is this now a tyre thread, like an oil thread but more rubbery?
because I like to pretend I'm still young and throw the bike around I'm very fond of my avon roadriders - nice round profile, sticky, predictable and track straight on the front, but the profile looks a little low on the front of the a10. a long life for me is more important than a long life for the tyre and i don't think they wear worse than any other comparable tyre. have them on the b33 too. i noted out at the classic racing meet recently that probably the majority of similar bikes had roadriders with melted sections on their sides from hard cornering. yum.
 
if i slowed down a bit or had to watch the $ i hear mitas do well on an a10, tho no personal experience.

interesting now i also have a modern how its wide profile tyres skip more when hitting cats-eyes and other road bumps, especially if leaned over. the a10 tracks much straighter under such circumstances.
New Zealand
'61 Super Rocket  - '47 B33 -  '18 Triumph Street Triple RS

Online beezermacc

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My mate (Paulo) finished building an A10 last year and fitted new K70's. He has done less than 3000 miles and the back tyre is nearly worn out. I use Avon SM's on my A10 and it handles fine and tyre wear is insignificant, though obviously I ride it quite conservatively. I've got TT100's on the RGS rep; I haven't used that bike for a while but I know that it is fine for grip and tyre wear.
Priory Magnetos Ltd - A10 spares, magneto and dynamo refurbs. www.priorymagnetos.co.uk