Vuka Clip Alumina A1 With Evo ExtensionsZipps Vuka Clip with Alumina Evo Extensions is designed to provide all the performance and adjustability you need to go faster. Vuka Alumina Evo are available with a 110mm (180g) rise. Designed with input from top bike fitters, the shape of the Vuka Alumina Evo is crafted to feel as if the rider is shaking hands with the bar. This is achieved through the use of a multi radius bend paired with a 20mm inward roll of the bar that can be adjusted to dial