Topeak Twinhead DX Upgrade Kit imp Smooth shifting is guaranteed by

Smooth shifting is guaranteed by single-tooth jumps up to the seventh gear

Rim design helps reduce aerodynamic loss and

4 GHz Wi-Fi connection

Water Transfer graphic

Topeak Twinhead DX Upgrade Kit imp Smooth shifting is guaranteed byNew design in full metal to quickly identify Presta and Schrader sides. Longer lever for easier use. Lower profile air release button to minimize unintended pressure release. Upgrade any existing pump to the TwinHead DX pump head includes extra long and mounting hardware. Specifications Head: Full metal TwinHead DX1, fits Presta Schrader DunlopMaterial: Aluminum head Rubber hosePressure Tuning: Air release buttonSize: 8. 2 x 5 x 4. 3 cm 3. 2 x 2 x 1.