Single chainset series shimano xtr applications all mountain enduro trail crank lengths 165 170 175 180 mm bolt sizes 96 64 mm construction shimano hollowtech ii speeds 1x11 features shimano dyna sys housing widths 73 68 mm chain line 504 mm q factor 168 mm crank arm material aluminium carbon pedal thread 916 1428 x 127 mm colour black weight 634 g