Tacx T4090 Gear Rollers - Sram Sram Race for Force, Rival and Red Smooth running jockey wheels The Tacx jockey wheels are manufactured from a resin composite that is very resistant to wear and equipped with quality precision bearings. Thanks to the closed bearings they will not get stuck, show play or squeak. For extreme circumstances, such as mountain biking or cyclo-cross, we have jockey wheels equipped with stainless steel bearings. Top of the bill are the wheels with ceramic bearings. They run extremely smoothly for the highest performance.