Zipp’s Vuka Alumina Clip Extension Mounts/Armrests are made of light, strong, stiff 2014-series aluminum and have nylon armrests with wide, comfortable foam pads. They're perfect for mounting your favorite extensions (sold separately) and finding your optimal aero position. There's also a model that goes above and beneath your base bar.
For 22.2mm-diameter extensions
Clamp diameter: 31.8mm
On base bars with a 120mm clamping width, the Vuka Allumina Clips have a maximum armrest width of 148mm. With Zipp's Pad Wing Extensions (below; sold separately), an extra 80mm can be added for a total width of 228mm.
The armrests for the Below-Bar model sit 37mm above the base bar and 65mm above the aero extensions.
The armrests for the Above-Bar mounts sit 60mm above the base bar and 31mm above the aero extensions (top left). You can add height with Zipp's Vuka Alumina Clip Risers (sold separately). Risers come in 10mm, 25mm and 50mm sizes for a total armrest to base bar height of 70mm, 85mm or 110mm. Risers are not stackable.