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Shimano GRX RD-RX400 10-Speed Rear Derailleur

Mfg PartNum:IRDRX400
$62.99
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The Shimano GRX RD-RX400 10-speed rear derailleur keeps shifting silent and uninterrupted when riding on rough terrain.

•A Shadow RD+ chain stabilizer prevents chain slapping and drops
•The gravel-tuned clutch tension helps to provide smooth and reliable mixed surface shifting
•Stabilizer can be turned on/off to match terrain
•Compatible with Shimano 10-speed road Dual Control Levers
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Reviewed 6/19/2020
by Anonymous
Overall Rating
Not compatible with older 10sp shifters

This is a great med long cage derailer. Shimano says max 36 tooth, but it seems to be working fine on a 2x system with 42 max cog. Thing to note this is shimano's new shift ratio, so grx shifters or new tiagra shifters are required, older 10speed shifters do not work.

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*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Sat). Orders over $50 are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details. 60