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use xr250 18" rear wheel


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well i got the wheel on to make sure everything would work out on it, seems to be ok. couple of questions tho. first is what size tire should i get that wont rub was thinking about a 100/90 or a 110/100 and second, do i need to change the small gear to a few more teeth or is it ok to leave on there. thanks

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One tooth less on the counter shaft is an almost exact match for the increased rolling radius going from a 17 to 18" wheel. I've run 13/49 with 18" wheels as well as 12/49 with a Trials tire. With the 17" wheel I've run 13/47 and 13/50.

Stay with the smaller tire, the 200s don't have enough power to take advantage of the larger tire, and there are clearance issues to the chain guard.

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