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Discussion Starter #1
I'm reluctant to change my worn 23 inch front tires to some 21 inch that are available cheap, but that increases bearing rpm by 20%. I'm not going to be ripping along most times as I do not "race", but I just picked up this old Polaris Express 400 and have reservations. Opinions??
 

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Discussion Starter #2
OOPs, make that only 10% increase in bearing rpm (pi*D1/pi*D2). Retire and your brain turns to mush. lol

10% not much to worry about, forget I ever asked!
 
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