Rims and tyres for Mk 1

hadders · Post by **hadders** » 02 May 2006, 15:46

I have a MK. 1 CRM 250 which I am thinking of converting to SM. I recently fitted USD front forks from a later model and need to know what is the maximum rim and tyre width I can fit without getting any chain rub.
I was thinking of: Front rims 3.5\" with a Maxxis Street sport 120/70 R17 tyre and Rear rims 4.25\" with a Maxxis street sport 160/60/R17 tyre.

I don't want to order this stuff, then find it won't fit.

Any help appreciated.

d5aul · Post by **d5aul** » 02 May 2006, 18:20

I have the same sizes on my Mk1, the rear tyre runs very close to the chain, I can see where the chain has fouled the tyre slightly, I have also had to cut off the inner Chain guard mount.
A 150 width would be much more suitable but you would still need to remove the chain guard mount.
The front is fine on mine (conventional forks).

hadders · Post by **hadders** » 04 May 2006, 04:07

Thanks, d5aul, seen the photo of your SM on an earlier post. The wheels look good.
what tyres are you using on you Mk1? and was the amount of chain rubbing a major concern? Also did you change your rear sprocket size?

Thanks

d5aul · Post by **d5aul** » 04 May 2006, 19:13

Hi, I am running Dunlop D207RR's, they are soft sticky track day tryes but road legal, I got them from ebay as a pair of part worns, only really scrubbed in & cost £50.
The chain rubbing has not caused a problem, the chain does actually clear the tyre but it is the sideways movement of the chain that causes the clash. done quite a few miles now & no problems.

hadders · Post by **hadders** » 05 May 2006, 05:30

Thanks again d5aul, that has sorted my problem. It will take a month or so to finish the project but will post a pic when it's finished. If I need anymore info , I will PM you.

Cheers