The shimano xtr m9020 trail 3424 11 speed double chainset is ideal for riders who need a wider gear range for those lengthy climbs and values the rhythm a 2x crankset can give your daily ride these cranks have a cold forged carbon aluminium construction with 3d hollow structure to increase stiffness the hollowglide outer chainring is made with a titaniumaluminium composite hollow 3d structure to maximize stiffness whilst keeping weight at a minimum and titanium teeth are used to keep it stif