I run Maxxis Goldspeed 120/70 and 160/60 road legal inter type things on the road '28 and I don't give a rats what anyone says about std tyres sizes blah blah blah, on the road you can't tell and on the track it'll scrape it's pegs and fairing, seems OK to me
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Please do not PM me technical questions, if you can't find it on the Forum start a thread