Designed to work perfectly with your 2x 10 or 2x 9 speed set up & in conjunction with your front derailleur Seamless AM performance & retention while maintaining maximum gear ratios 6061-T6 aluminium backplate saves weight Direct mounted bashguard keeps rocks away from chainrings 48-53mm chainline compatible Adjustable sliders accommodate up to 32T or 40T rings All alloy hardware & flush captive fixing save weight & increase clearance Upper shark fin stops chain wander on rough tracks Swappable, smooth running dual stealth lower roller Four BB fitment options Built for AM/ Gravity Approx. Weight 149 grams