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Tire sizes ????
Posted: Sun Aug 23, 2015 6:41 am
by Ross
Will these tire sizes fit my 86 R80?
Front is 110/80/18.
Rear is 120/80/18.
Re: Tire sizes ????
Posted: Sun Aug 23, 2015 8:59 am
by Kurt in S.A.
They don't look right to me...check the tire sizes on this page:
http://www.bmbikes.co.uk/specpages/R80mono.htm
Kurt in S.A.
Re: Tire sizes ????
Posted: Sun Aug 23, 2015 11:52 am
by Jeff in W.C.
What Kurt said.
Re: Tire sizes ????
Posted: Sun Aug 23, 2015 3:49 pm
by Major Softie
As per the link, stock was 90/90 front, 120/90 rear.
That rear will probably fit fine, but I don't think there's much chance that a 110 is going to fit in your front forks. It will probably make the handling much heavier as well.
90 series was stock. 80 series will be a little shorter sidewalls. That gets you a little bit lower ride height (maybe 1/4" - 3/8"), and slightly less protection for the rims on sharp cornered hits of potholes and the like, but not a huge difference. I ran 80 series on the K75, and they were fine (you're Y-spoke wheels, right?). Those were
BT45's, which are offered in your stock sizes. You would probably change little if anything about the handling if you changed from 90/90 f, 120/90 r - to 90/80 f, 120/80 r, but I don't know what the chances are of even finding a 90/80.
Even sticking with 90 series tires, some models may force you to go to a 100/90 by not offering a 90/90 (GT501's are such an example), but I'd steer clear of the 110.