Shimano GRX ST-RX810 Shifter/Brake Lever BR-RX810 Hydraulic Disc Brake Caliper - Left/Front 2x Flat Mount Caliper ModelNumber=K8268 The rack base is attached

The rack base is attached to the seatpost clamp with a hinge allowing it to rotate vertically up to the saddle

Two AAA Alkaline batteries included

Handle and wheels make for easy transport

5" ISO Width (mm) 60 Labeled Size 27

Shimano GRX ST-RX810 Shifter/Brake Lever BR-RX810 Hydraulic Disc Brake Caliper - Left/Front 2x Flat Mount Caliper ModelNumber=K8268 The rack base is attachedShimano GRX ST RX810 Shifter Brake Lever with BR RX810 Hydraulic Disc Brake Caliper Left Front 2x Flat Mount Caliper. GRX ST RX810 Shifter Hydraulic Brake LeverGravel inspired Dual Control shift brake lever and bracket ergonomics Anti slip brake lever Same light shifting operation as top tier systems Tooled reach adjust allows for lever to be adjusted to fit multiple hand sizes and riding preferences TECH SPECS Brake Lever Actuation Hydraulic Double