The SRAM PC XX1 has been perfectly engineered with X-Sync technology for maximum control.
- X-Sync - A "wide tooth, narrow tooth" pattern is repeated around the pulley wheel, perfectly mirroring the chain's inner and outer links for maximum control
- Precise And Dependable 11 Speed Performance
- Speed Metal Shift Indexing
- Rolling Thunder Ball Bearing Technology
- Jaws Lock-On Grip Technology
- Full Gore Ride-On Cable System