Zipp Wheel Axle End Cap Set Rear ZR1 Disc Brake N3W Campagnolo BX PSI The S3 combines standout features

The S3 combines standout features from two renowned performance favorites

Everybody who works on bikes knows how much you need allen keys

giving you extra pedaling efficiency when you find yourself on longer or faster trips

tidy and light mount that integrated perfectly

for a smoother ride and greater traction

Zipp Wheel Axle End Cap Set Rear ZR1 Disc Brake N3W Campagnolo BX PSI The S3 combines standout featuresReplacement end caps for Zipp ZR1 rear hubs with Campagnolo N3W freewheel body for disc brakes. Specifications Material: aluminum Compatibility hubs: Zipp ZR1 Disc Brake rear hubs with Campagnolo N3W freewheel body Axle standard : 12x142 mm thru axle type Color: black anodized Mfr Claimed Weight 14g