Update your aerobar and improve your time trial position with the Zipp Vuka Alumina Clips Evo Extensions. Built to provide an effortless balance of control, comfort, and aerodynamics, this clip and extension combo is an integral piece of the puzzle as you race to take seconds off the clock. The Zipp Vuka Alumina Clips Evo Extensions provide highly adjustable and versatile positioning options with a 22. 2mm extension clip diameter and a 31. 8mm bar clamp diameter. These dimensions are compatible with nearly every reputable base bar and extension, leaving ample room to experiment with positioning to lock in the perfect combination of aerodynamics and comfort. Zipp constructs the Vuka Alumina Clip from a shot peened aluminum that's both stiff and resistant to fatigue, and its adjust mechanism allows for both angular and rotational tweaks to dial in the fit. The EVA foam pads are pre shaped to perfectly holster your arms with position adjustment up to 12. 5mm behind the base bar. The Vuka design hinges on Zipp's compression sleeve for attachment. Accordingly, the clips don't involve external mounts or hardware, and the frontal profile of the Vuka has been minimized as to not contribute to drag. Even further along these lines, each Vuka Clip features internal cable routing. The Zipp Vuka Alumina Evo Extensions are the perfect pairing with the Alumina Clips, a collaboration between Zipp and a stable of expert bike fitters to best meet the needs of time trialists and triathletes. Designed with a multi radius bend and a 20mm inward roll, these extensions provide exceptional comfort and place your hands closer together and slightly higher for optimal aerodynamic and long distance comfort. Plug style shifter attachments at the ends of the extensions keep the shifters close at hand for quick gear changes without needing to break your aero tuck position and, like the Vuka Clips, the Vuka Extensions feature internal cable routing for clean lines.