Sorry for the late reply.....been out of town all week. I just went out and checked it, and it's a T135/80D16. I couldn't get to it to get it out because of where my car is sitting, but the best measurement I could get on it was 26". I've never had to use it, but I put it on the front of my car to make sure it cleared the brakes, and it does so without using spacers. I have 11.75 rotors and pin type calipers on my car. I have Torque Thrusts on my car, so I keep 5 regular lug nuts tie wrapped to one lug hole. That is covered by the jack plate, so nobody ever sees it.