XX1 cranks have carbon arms with a forged aluminum spider. The alloy chainring bolts thread directly into the chainring which lays into the stepped spider for a very solid interface that eliminates the need and weight of chainring nuts. This crank does not include a chainring so you can order the exact size desired separately. SRAM offers the XX1 crank in two Q-Factors: 156mm or 168mm so you can dial in frame clearance and/or riding position.

The chainrings on most double and triple cranks have to be designed for chain movement which can lead to the dreaded dropped chain (which always seems to happen at the worst time). Since XX1 is a single front chainring system, the chainring can be designed around chain retention.

SRAM engineers looked into the causes of chain drop and video analysis showed side to side movement was the main culprit. They came up with a CNC-machined, wide tooth, narrow tooth pattern which perfectly mates with the XX1 chain for a snug fit. This profile known as X-Sync™ also features slight taller, squared-off teeth that makes chain drop a virtually non-issue.... Read More