Shimano Alfine FC-S501 Bells and Horns Pair of N-type disc brake

Pair of N-type disc brake pads with fins

Ergonomic rubber coated non-slip side plates for increased grip

designed for 135mm QR and 142mm thru-axle frames

And if you're torn between this and the Expert

Shimano Alfine FC-S501 Bells and Horns Pair of N-type disc brakeUrban styled forged alloy crankset Perfect match with Alfine internal gear hubs Single chain guard 42T chainring 42. 7mm chainline BB included (SM BB4600) Attributes BB Inclusion Yes BCD 130 Chainline 42. 7mm Crank Arm Length 170mm Crank Spindle Diameter 24mm Crankset Material Aluminum Drivetrain Spacing MTB Interface Hollowtech II Pedals Thread 9 16'' Primary Color Black Speed 1 Teeth 42