Double chainset series shimano dura ace application racing bike chain wheel teeth 5342 5239 5442 5542 5644 5034 crank lengths 165 167 5 170 172 5 175 177 5 180 mm bolt size 130 mm construction shimano hollowtech ii speeds 2x10 housing widths 68 70 mm chain line 435 mm crank arm material aluminium pedal thread 916 1428 x 127 mm colours black grey weight 725 g