Aero extra-stiff, aerodynamically optimized, 7075 aluminum, with stainless steel chain lifting aids, work on the CNC. Compatible with 39 tooth inner chainring only.
- Teeth: 54T
- Round bolt: 110mm, 4 holes
- Crank arm compatibility: Powerbox
- Suitable for Shimano 10 / 11s, Sram 10 / 11s, FSA 11s groups
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