Weight-Optimized The radical new look and feel of SRAM's X-SYNC™ 2 Eagle™ chainring is a direct result of SRAM drivetrain engineers studying the performance and wear characteristics of thousands of X-SYNC™ chainrings. They subjected every size of chainring to untold environmental and mechanical tortures, abuse and neglect, in both lab and real-world settings, to come up with a chainring that would augment the Eagle™ drivetrain's performance in all conditions. The longer, positive-rake tooth shape has been designed to work perfectly with the new Eagle™ chain to increase chain retention and overall pedaling efficiency, while decreasing friction, noise and wear. With the SL version offered here the weight was further reduced by CNC-milling. 3 mm Boost Offset X-SYNC™ 2 SL chainring design increases chain retention, wear life, and reduces friction and noise. Designed to be used with Eagle™ chain but works also with 11-speed systems. Fitting for derailleur: 11-speed ||| 12-speed Included in delivery: chain ring and screws Material: aluminium Offset: 3mm (Boost)