These are ET wheels I had custom made for my dragster - as Team III is great about doing. They are 10" wide, 15" diameter and a 5 x 4.5 bolt pattern - I've got a Chrysler 8 3/4 with big Ford ends on it, hence the Ford bolt pattern. There is 4.5" backspace. Mounted on 10.5/30.0 x 15 M&H Racemasters. John Hashim mounted these, and said that the original stem hole was in the wrong spot for the slick tube, so he plugged the original with a blocked off stem and drilled another hole for the slick stem. The wheels and tires have been mounted on the dragster, but never run - and other than for photos, haven't been resting on the ground. The dragster has always been on stands in a garage. Only reason I'm selling is I'm going a slightly different direction with a wheel/tire combo. I'm in Sacramento, CA