Rear Wheel Size??

okay,i finally got me a blaster after doin alot of reading up on here .2001 for $800,not bad for a trail beater.
anyway,should i get 9 inch rear wheels or keep the 8s? it seems like tires for 9 inch are more common to find.it came with new balloon knobbies that are way too tall.thinkin 20inch razr.18 woould probably be too low under the swingarm.thanks!!!

I use 20in razrs in the rear and i think they work great. But if you want 9in rims you have to get warrior hubs and then rims. The hubs are $70.00 on projectblaster.com or you can get them on ebay.

what kind of riding do you do?

just trail ridin,nothing too extreme as far as jumps and stuff.