The Oversized Pulley Wheel System for SRAM Red and Force AXS features a 15-tooth upper and 19-tooth lower pulley wheel setting, for maximum efficiency. The hand-built OSPW System has two spring tension settings, that allows customized setup based on riding conditions.  

This OSPW System is also compatible with the 2020 11 speed SRAM Red eTap derailleur featuring a clutch. 

This specs are from the information each brand releases and may change without previous notifications.