X
Mon-Sat 8am-5pm PT
FREE SHIPPING ON ORDERS OVER $50More info
JOIN OUR EMAIL LIST
Sign Up
Serving cyclists
since 2002
WISH
0
Click Here for Larger Image

Shimano GRX RD-RX400 10-Speed Rear Derailleur

Mfg PartNum:IRDRX400
$62.99
Out of Stock
Ships Free!
Earn $6.29 in VIP credit. Click to Learn More.
629
POINTS
This color/size is not eligible for VIP points

The Shimano GRX RD-RX400 10-speed rear derailleur keeps shifting silent and uninterrupted when riding on rough terrain.

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.

  • Smooth and reliable mixed surface shifting
  • Silent and uninterrupted rear shifting on rough terrain
  • 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
  • Compatible with current 10s road Dual Control Lever
  • Wide range front gearing — Maximum front T difference: 16T
  • Top sprocket: Max. 11T/Min. 11T
  • Low sprocket: Max. 36T/Min. 32T
  • Total capacity: 41T

  • B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

    Ordered by Most Relevant First
    5 stars
    4 stars
    3 stars
    2 stars
    1 stars
    (1)
    (1)
    (0)
    (0)
    (0)
    (50%)
    (50%)
    (0%)
    (0%)
    (0%)
    Reviewed 6/19/2020
    by Anonymous
    Overall Rating
    3 of 3 customers found this review helpful.
    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.

    Was this review useful to you? Yes/No
    Thank you for your feedback.
    Reviewed 8/19/2020
    by Anonymous
    Cycling Enthusiast
    Pasadena, CA
    Overall Rating
    Major upgrade from Tiagra RD for gravel use

    Never quite felt like the Tiagra RD was suitable for rough gravel use (fallen chain, choppy shifting on climbs and descents). Very pleased that Shimano didn't overlook 10-speed bikes when they released their GRX components. The clutch system on the GRX RD is really amazing at reducing the chain slap (though at the expense of slightly less crisp shifting... but can always turn off the clutch for riding on smooth roads). On top of that I was able to put on a larger cassette to make climbing on gravel easier. The recommended max 11-36 cassette combined with my bike's 32/48 crankset gives me pretty much the exact range I need.

    Was this review useful to you? Yes/No
    Thank you for your feedback.

    We are committed to delivering outstanding value and service to our customers, every day.
    Try us today to see why so many of our customers come back again and again.

    *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. 33