Shimano GRX RD-RX817 Di2 Rear Derailleur WorkMate Serial Numbers Mounting hole spacing: 18–23 mm

Mounting hole spacing: 18–23 mm (center-to-center

and unmatched mud-shedding capability

whether you're cruising down the highway with the top down or hitting the trails on your mountain bike

The base layers are close fitting and cut long at the back for a better fit on the bike

These minerals work together to help replenish electrolytes lost through perspiration and support normal muscle contraction during prolonged physical activity

Shimano GRX RD-RX817 Di2 Rear Derailleur WorkMate Serial Numbers Mounting hole spacing: 18–23 mmThe Shimano GRX RD RX817 Di2 Rear Derailleur is designed specifically for gravel and adventure riding, delivering fast, precise electronic shifting performance across rough and variable terrain. As part of Shimanos GRX 11 speed Di2 ecosystem, it is built to maintain stability and control in demanding off road conditions. The derailleur is compatible with Shimano 11 speed drivetrains and supports cassette ranges up to 1142T, making it suitable for both