"The EC90 SL crank uses RaceFace Cinch technology, which allows direct mounting of 1x chainrings and 2x spiders, as well as industry-leading versatility. Increasingly popular 1x setups have many advantages such as weight and simplicity. Their biggest limitation is adaptability. A cyclocross rider's ability to ride a course and then effortlessly change chainrings to their preferred setup is a critical need that has been overlooked. The chainring has a narrow / wide tooth profile. Easton refines the design for larger chainring applications with improved chain retention while reducing running noise and friction. Finally, Easton launches a new line of low friction bottom brackets to complete the EC90 SL crank package. BB Sold Separately.