Shimano GRX ST-RX820 12 Speed Shifter + Flat Mount Caliper Size:Left Shifter / Rear Brake Scrub with a sponge or

Scrub with a sponge or soft brush

Front Hub: 16 aerodynamic radial spokes

Potassium Citrate

Once armed

Rush RL lockout

Shimano GRX ST-RX820 12 Speed Shifter + Flat Mount Caliper Size:Left Shifter / Rear Brake Scrub with a sponge orWith 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