Shimano GRX ST-RX820 12 Speed Shifter + Flat Mount Caliper Size:Left Shifter / Rear Brake Consistently smooth and light shifting

Consistently smooth and light shifting operation

Even a single atom layer is enough to reduce the friction considerably

Reduces friction to ensure silky-smooth gear shifts

Front Hub: 16 aerodynamic radial spokes

Rush RL lockout

Shimano GRX ST-RX820 12 Speed Shifter + Flat Mount Caliper Size:Left Shifter / Rear Brake Consistently smooth and light shiftingWith the GRX, Shimano brought the first gravel specific shifting group onto the market. Since then, the range of uses and the range of gravel bikes has expanded significantly. Shimano takes this development into account by also expanding the range of the GRX group. With 12 sprockets on the rear wheel and the option to choose between a 1 speed and 2 speed setup, you can adapt your drive even better to your needs. Specifications ST RX820 Shift Brake