stock tire is a 190 55 17, but not many people are rich and able to put $200 plus tires on. 190 50 17 are fine. I have ordered mine some people said that an added shim of 4.5mm to the rear shock makes it identical as a stock 190 55 17, dropping profile drops the rear of the bike. Some people say leave the shims alone and see how you like it, some people say that it is more flickable that way. There is only like 3 choices in the 190 55 17. Michelin power piliots, but they are so soft I can only imagine getting maybe 1600 miles max on them.
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