- Updated design for smoother and faster shifting
- More gradual gear progression between cogs-at least five one-tooth jumps-while still offering a wider range
- 10-tooth start helps provide a wider gearing range
- Designed to work with an XDR™ driver body
- One-piece machined steel X-Dome™ design for weight savings
- All Zipp wheels starting from 2012 are XDR™ ready