ruffrider,

I currently run a 150/60 (stock size) on my MC21R Trackbike, however, when running my slicks 160/63/17 I have to add @ least 2 links to my RK Gold 520 chain, this needs to be done to allow rear wheel clearance from my right side chamber. It will change the geometry(longer wheelbase) and will compromise handling but give better stability in turns. my .02

GL
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