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i don't know about 18" sportsman tires, but i've got a 140 s12 on my 18" for dirt with no clearance problems
 

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Running a 140 IRC street tire on my XR600 with the stock rear rim... It is pinched a bit and I cannot use about the last 3/4" of tread on either side due to the roll-over of the tire...

My buddy with an XL600 (stock 17" rear rim) actually has a tire that looks wider, but is a 130....
 

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Not being able to use the last 3/4 inch may not be that big of a deal on a street bike but the guy asking the question is planning on racing the thing. My advice is don't get too hung up on the look of a big tire, stick with something that will work. A tire pinched in that much is actully a smaller contact patch at full lean than a narrower but properly sized tire. Ask yourself, what would be the benefit of the bigger tire?
 
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