Sram xx1 x sync cranksetsrams xx1 x sync 1x crankset provides the ultimate in both high performance and extremely low weight equipped with srams x sync chainrings with their tall and square tooth design alternating thickness and chamfered edges youre guaranteed excellent chain retention over all terrains simple chainring swapsthanks to the crank arms direct mount chainring design changing to a different tooth count is simpler which means less fettling with chainring bolts and more tim