rims: factory Yamaha rolled lip rims from shee/rappy/yfz are the strongest aluminum rims i've found, you'll need those 4x115 bolt pattern rear hubs too
10" front, 9" rear
tires: 22" front, 20" rears, besides decent ground clearence, bigger tires roll over obstacles easier and smoother than smaller tires, especially the fronts
13/40 gearing: quickness in the trails, i could care less about 14/40 top speed
1/2 naked pic
Razr2's rear, Carlise Trail Wolf fronts < decent tire but soon to be matching Razr2's
10" front, 9" rear
tires: 22" front, 20" rears, besides decent ground clearence, bigger tires roll over obstacles easier and smoother than smaller tires, especially the fronts
13/40 gearing: quickness in the trails, i could care less about 14/40 top speed
1/2 naked pic
Razr2's rear, Carlise Trail Wolf fronts < decent tire but soon to be matching Razr2's