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Zipp Speed Weaponry Cartridge Bearings

Zipp's Stem Top Cap and Bolt are designed to work specifically with Zipp stems. The eight-gram aluminum cap and nine-gram-bolt are the same as those used on bikes built for Zipp-sponsored professional teams. The bolt has a T25 Torx head for ease of adjustment and so you need only one tool for your Zipp cockpit.

The perfect bike fit needs to blend slippery aerodynamics and a comfortable, stress-free body position while optimizing control over the bike. Top fitters are constantly devising new methods to maximize and balance these goals. Designed using feedback from top fitters, Zipp’s Vuka Carbon Extensions give you all the options needed to optimize your position and go for the win or your personal best: Vuka extensions decrease drag by starting airflow over the body sooner while keeping the arms and wrists in a comfortable, relaxed position. Vuka Race Carbon Extensions were designed using data compiled from thousands of fit sessions with recreational and professional cyclists and triathletes by the world’s best fitters. The Vuka Race bend places the wrists at a more natural bend to help riders remain in their tuck to optimize aerodynamics. - Compatible with all 22.2mm clip-on systems - Material: Unidirectional carbon - Internal cable routing - Length: 380mm

Zipp Speed Weaponry Cartridge Bearings - Will not work on Zipp 188 V9 rear hubs