The shimano xtr m9020 trail 403022 11 speed triple chainset is shimanos widest mtb gear range ever and with three rings up front rhythm is optimized 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 stiff light weight and hard wearing comes