They are mounted on 15" steel rock crawlers. I have not too much mileage on them so there is a ton of tread on them. There are some minor cuts on two of the tires and some good scrapes on the rims (damn Shredder Canyon!) I have not flatted on them and they don't loose any pressure (they hold their air). PM with your e-mail and I will take some pics within the next couple of days. I am hoping for $500.