Shimano GRX RD-RX400 10-Speed Rear Derailleur Size_700x18c 32 holes with an inner

32 holes with an inner width of 35mm and outer width of 39

11T Top sprocket_Min

and downhill specs

The Crossmark II improves on the speed of its predecessor while improving grip in intermediate conditions

Shimano GRX RD-RX400 10-Speed Rear Derailleur Size_700x18c 32 holes with an innerSHIMANO GRX Rear Derailleur 10 speed RD RX400 SHIMANO GRX Rear Derailleur SHIMANO SHADOW RD+ 10 speed With an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON OFF switch for the chain tensioner. FEATURES Silent and uninterrupted rear shifting on rough terrain Adjustable chain stabilizer