I bought this Blaster a few months ago and slowly my son and I have been upgrading it. Nothing major, just little things. Well now it is time to address the (21X10X8) ballons out back. HAHA I was going to simply buy a set of used Raptor wheels and tires and decided the keep the stock 8s because of their perfect condition and money. Looking for a small sidewall tire that is inexpensive. I been searching abit and seeing stuff like Kenda that are reasonable but I am not sure what size I should consider. Bike will spend most of the time on dry land and established trails so clearance is not a worry.