Proven to be the fasted pulley system in the world, the CeramicSpeed Oversized Pulley Wheels System is the ultimate tool to elevate your performance. The CeramicSpeed OSPW SRAM eTap has an overall power savings of 40%-60%, or more in some cases, over a stock setup. The SRAM eTap commits to a lifetime that is 3-5 times longer than other standard pulleys on the market. The OSPW system for SRAM eTap derailleurs is compatible up to a 32-tooth cassette size and with both short cage & WiFiLi derailleur bodies. Please note that the CeramicSpeed OSPW SRAM eTap is for 11 speed eTap and is not compatible with 12 speed SRAM eTap AXS.