The SRAM Eagle X-Sync 12 Speed Offset Boost Chainring. The new look and feel of the SRAM Eagle™ X-SYNC Chaining is a radical move away from existing designs. Featuring a longer, positive-rake tooth, the X-SYNC™ chainring has been perfectly engineered to work in unison with the Eagle™ Chain to increase chain retention and peddling efficiency, whilst decreasing noise, friction and wear. The X-SYNC has been meticulously designed by SRAM drivetrain engineers, who have studied the performance and wear of countless X-SYNC™ chainrings in the most extreme of environments to create a chainring that would augment the Eagle™ drivetrain performance, in all possible conditions.   SRAM Eagle X-Sync 12 Speed Offset Boost Chainring Features X-SYNC™ 2 Technology Longer, Positive-Rake Tooth Design Designed to be used with the SRAM Eagle™ Chain 12 Speed – Boost 3mm Offset