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Fast&Up Reload ISO provides a comprehensive solution with its unique formula
and versatile power options make it the perfect companion for a range of tasks
This ensures enhanced control and confidence
It delivers straightforward performance without unnecessary embellishments
Shimano GRX RD-RX400 10-Speed Rear Derailleur system_spd Fast&Up Reload ISO provides aThe Shimano GRX RD RX400 rear derailleur is designed for 10 speed drivetrains, delivering reliable and precise shifting across mixed terrains. Its integrated chain stabilizer mechanism ensures consistent performance, even on rough trails or gravel paths. Quieter Rides on Any Surface: Engineered with an innovative chain tensioner, this derailleur reduces chain slap and noise, offering a quieter and more enjoyable ride. The On Off switch allows you to