We race what we sell. The Factory Spec breeds confidence and delivers a level of feeling, response, and traction like never before. FEATURES The Geomax Factory Spec tire features an optimized single-radius profile to provide the ultimate control characteristics for when the track conditions deteriorate and become rougher during the race. With thousands of hours of testing, Dunlop developed an optimized single radius profile for increased control. Advanced Apex on the Factory Spec provides a larger apex for improved responsiveness and increased support for higher speeds and harsher landings. Proprietary Ultra-High Molecular Mass compound features extended polymer chains that increases bonding points with the carbon molecules to deliver a rubber that is extremely strong allow the knobs to penetrate the ground more effectively. PCBT Increases surface area for additional traction and slide control. Soft Works in soft terrain such as loamy soil, sandy or muddy conditions. Intermediate Works in a mix of packed and loose soil. Off-Road Provide grip and handling for off-road performance Tire Name Size Load/Speed Index Sidewall Part Number Applicable Rims Recommended Rim Overall Diameter Overall Width Full Tread Depth Maximum Load @ PSI GEOMAX FACTORY SPEC Front 80/100-21 51M 45276500 1.60 28.03 3.66 16/32 GEOMAX FACTORY SPEC REAR 110/90-19 62M 45276501 1.85 2.15 27.48 4.92 23/32 GEOMAX FACTORY SPEC REAR 120/90-19 66M 45276502 2.15 2.50 27.63 5.24 23