Gebla Shimkit for Shimano GRX

Convert compatible Shimano STI hydraulic levers (GRX810, GRX600, GRX400, 105 ST-R7020) for Rohloff shifting via the Gebla Rohbox. Designed for 2022+ production models with right-hand internal threads. Requires the ShimKit Crown Tool (sold separately) for installation. Please verify your lever's production year to select the correct variant (A21 vs. A22).