The SRAM XX1 components are designed around the single chainwheel philosophy: Simple, lightweight and effective
A single chainwheel (available in various teeth sets), 11 speeds on a 10/42 cassette: all you need to ride anywhere in either XC or Enduro.
The star is specifically designed to easily change chainwheels without having to disassemble the chainset. This allows you to adapt the toothing according to the terrain or plan for the day.
BCD (Bolt Circle Diameter) : 76 mm
Bottom Bracket Included : No
Bottom Bracket Width : BB30
Crankarm Length : 170 mm, 175 mm