Oversized Pulley Wheels 15/19 tooth: Spare pulley wheels for your CeramicSpeed OSPW for SRAM Red/Force AXS.Fits the following OSPW systems: - SRAM Red/Force AXS- SRAM Rival AXS Maintenance of CeramicSpeed Oversized Pulley Wheels 15/19 tooth:- No set rules can be made for how often your Oversized Pulley Wheel System should be maintained. Maintenance frequency depends on the weather conditions that you are riding in. See below the maintenance advice for the Oversized Pulley Wheel Systems for SRAM, also useful in the case of Shimano.