Trying to find a tape measure in this house is like finding a pen that isn't out of ink. I'm not sure of the size but the width is definately wider than a standard buggy rim. I found some by Ofna and Inetgy that are called super wide "or something like that", looks like they resemble the stock rims. Look at the pic, they are Super Wide. I love them. I do want to play around with some huge monster truck tires, this thing breaks the tires loose on the road, they just spin in the grass so I don't think going a little taller will be an issue. But I like the way it handles with the stockers on there, just want to get away from the fragile Redcat rims.