blaster tires

Stock tires are 21" tall. I just installed a set of 22" Mud Lites on the front and rear of my blaster. I've only got an hour or so on it since, but so far they rip! Taller tires = more ground clearance and more traction. So far I'm happy with the gearing with the 22s and stock gearing. If I wasn't, it's not hard to change....just bolt on new sprockets.
 
the last number, in this case 8, is the diameter of the rim (or wheel, whatever you wanna call it). The rim also happens to be 8" wide, so you can fit tires from about 9" to 12" wide on them no problem. In your case, the second number, 10, is the width. Dont' be afraid to go an inch or two wider. And obviously, the first number is the diameter of the tire.