Im changing my enduro like yours with 21 18 combo .I got a front rim off cr80r and got a tire from bike bandit im running the 18 in back with a 100 /80/18 and a 80/90/17 on front.Both front and back tires for under 100.Im building the lifan 150cc vertical with porting and polishing and five angle valve job.Also high compression piston and maybe fuel injection. I want the fastest china bike supermoto. Im lightening as well I would like to get down to 200 lbs for the bike.Im building a aluminum swingarm also and changing sprockets. I think it will be pretty fast