Pro Armor Crawler XR Tire 30 X 9 X 15 - The Crawler XR has been engineered to provide unmatched grip and with its harder compound will wear less than Pro Armor's XG tires. The 30 Pro Armor Crawler XR is built for the rocks and the aggressive tread pattern and 8-ply rated Armor Belt construction provides supreme performance and is also highly puncture resistant. The XR has the lesser tread height and a smaller size in comparison with the XG but utilizes the harder compound. Tire diameter: 30 in Rubber