The Pro Armor Crawler XR 33"Tire was developed to deliver the same great rock crawling and all-around trail and high desert performance as itäó»s smaller brother the 32" & 28"tire but with more tread to grip and fits a 15"wheel. A square traction profile provides great trail and desert performance, while a soft-durometer compound is ideal for extreme traction on rocky surfaces. The Crawler 33" XR has been engineered to provide unmatched grip and with its harder compound will wear less than our XG tires. The 33" 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.