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Http://www.4strokes.com/tech/equipchart07.pdf is a list of requirements. I would do a 90/100-16 tire on an xr80 front wheel up front and a 100/90-16 tire on the stock rear wheel for street use. For racing I would get 12's unless it is a fast course where I would get 17's and a crf150 front end. Get a 120+ cc big bore kit if you are riding on the road. I ran 1 up, 1 up gearing with a 420 chain and it really woke the bike up.
 
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