The 7700 style crankset is Shimano's latest style in a track crankset. The spider arms are reinforced for added stiffness and durability and specifically machined to accept only one ring. Alloy arms are cold-forged and polished to a high luster. These cranks accept Octalink BB's only. The ultimate track crankset for the ultimate track or fixed gear bike. Chainrings and bottom bracket sold separately. Chainring bolts included.