Topeak Twinhead DX Upgrade Kit BX Apparel the SHIMANO GRX derailleur provides

the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain

while the Trinity Advanced SL TT frameset is made for time trials

Stylish and functional

and a 40mm rim depth

Diameter: Max 80mm

Topeak Twinhead DX Upgrade Kit BX Apparel the SHIMANO GRX derailleur providesNew 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.