Im tired of my tsl mud boggers, poor mileage and chunking on trails so i decided that i wanted to do mtrs. Then I remembered that HMMWVs had them and while they arent kevlar they are on HMMWVS so I figure they have to be pretty strong. The side walls on these are ridiculously stiff. Almost no flex at all, at least cold. I drove them around the city and it was jarring me left and right. The weight on these are crazy at least 150lbs with double bead locks and rock rings. I will never have to put sand or water in my tires for traction. Thats for sure. BS is 3.5 I had 4.5 orignially, but rubbed on my inners a bit.