Shimano saint m815 crankset the extreme duty hollowtech ii saint crank arms drop nearly 150g in weight and are over 200 stiffer than deore xt hollowtech ii design for the first time saint uses the same exotic duralumin material featured in xtr and dura ace cranks for a crank and spider that are over 2 times as stiff as deore xt fc m815 83mm shell longer bb adapter cups new longer bottom bracket adapters stay put even when pushed to the limit and improve compatibility with aftermarket