Tire size

20 fronts and 18 rears. It depends on what kind of riding you are doing though.
 
Cool...it looks like 20 rear is a common tire... for Florida it is real flat and sand.
Thanks again for the fast respond. The bike is for my son and he is only 12 that was why I bought the 18's.

Thanks, Scott
 
I'm useing a 19 holeshot in the front and a 18x9x10 turftamer for the loose stuff on the track. The 20's and 22's are sorta for the bigger guys in my opinon.
 
I agree I will be going with 20's on the rear for trail riding on both my blasters, my boyfriend has holeshot 18's on his right now and he bottoms out and gets stuck all the time, i currently still have stock 21's and have no problem getting around but I hate the balloony tires so I will be switching soon