Sunrace's FCM300 Chainset is ideal for 7/8 speed bicycles with 48/38/28T 170mm crank arms for smoother shifting and fast operation. Durable construction ensures long-term reliability and worry-free use.Features:Aluminum armsJIS square Taper7/8 speedFluid DriveSteel unified chainrings127mm suggested BB for 50mm chainlineFull sized pant leg guard