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SRAM GX Type 2.1 10 SPD Rear Derailleur

Item #: RD212A00
From USD$52.99 SAVE 13% USD$61.00 msrp
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SRAM GX Type 2.1 10 SPD Rear Derailleur

SRAM GX 2x10

Ride Your Way, Far And Wide

For every bike, there’s a rider. A rider who builds it. A rider who knows it. A rider who’s always ready to take the bike somewhere new. Introducing GX, the drivetrain for people who love to ride without restraint. From beginner to expert, GX delivers personalized gear choices that take you as far and wide as you want to go. Engineered in Germany with 1x and 2x options, SRAM GX brings the power of riding to everyone, everywhere.

GX 2x10 Rear Derailleur

Leveraging the legendary history of SRAM shifting, the GX 2x10 rear derailleur provides incredible shifting speed and precision. EXACT ACTUATION™ technology eliminates slop and shifting variation. ROLLER BEARING CLUTCH™ technology delivers maximum drivetrain stability-even through the most punishing terrain. And with CAGE LOCK™ technology, wheel removal and installation are easier than ever.


  • EXACT ACTUATION™ for precise and dependable 10-speed performance
  • Cage lengths: Short, Medium and Long
  • Color: Black
  • Weight: 302g (long cage with ROLLER BEARING CLUTCH™)
  • Max Cog Size: 36T
  • Chain Wrap Capacity: Short: 30T, Medium: 35T, Long: 47T
  • Equivalent to previous X9 derailleur
  • 4.6 / 5.0
    44 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    GX vs X0
    derailleur is mounted on an unveil-9 and shares ride time with a jet-9 with X0, the GX is crisp shifting and performs on par with its X0 counterpart, the initial rough clutch action smoothed out with use. Winter thaw is over and the mud season is in full swing. Time will tell if the GX is as durable as its more expensive cousin - so far its performing well.

    PROS: Attractive Price, Typical Good Sram Quality, Easy To Install

    CONS: Clutch Was Sticky

    BEST USES: Mountain Biking, Cxgravel Riding
    March 7, 2016
    fancy prairie ill
    Great clutch derailleur for replacing older models
    I had a SRAM X5 derailleur from 2012 which just exploded due to it hitting branches. I replaced it with this SRAM GX 10-speed and it works flawlessly with the X5 shifter. Now I can take advantage of the clutch and lock on the new offering from SRAM!
    September 5, 2016
    Quebec, Canada
    Great derailleur
    Paired this derailleur with a narrow wide chain ring and haven't dropped a chain (I ride dh/freeride/trail). The clutch has more force tensioning the chain than the x9 did. Shifting seems on par with the x9 also, maybe a tad lower in performance but I did do a full drivetrain rebuild so difficult to compare in that aspect.
    October 11, 2016
    A Quality Rear Mech
    Typical Sram shifting. The shifts are snappy and once tuned to perfection (which is a task everyone should know how to do), it will shift with little to no hesitation. I put a short cage version of this on my Yeti 303 RDH (replacing a 9 speed). It really makes a difference on short uphill sections (which occur on the occasional DH trail).
    September 18, 2016
    Colorado Springs, CO
    Perfect for the Price!!!
    This is the best choice for that price. Highly recommended

    PROS: Easy To Install, Looks Durable, Great Compatibility

    BEST USES: Mountain Biking, Upgrade
    December 14, 2015
    good quality, what expected
    I used this one to substitute my broken X0, it was already too old. The new capabilities of this one makes easier to take out the wheel. Also is more stiffer so the chain is not jumping around and making those clank clonk clink clonk noises with the stays. Good quality product.

    PROS: Durable, Easy To Install
    January 27, 2016
    Dominican Republic
    a winner product , way to go sram !
    Easy to install , fast and accurate shifting action

    PROS: Easy To Install, Lightweight
    December 17, 2015
    Great derailleur
    Super easy to setup and shifts like butter.
    June 21, 2016
    Roosevelt, NY
    Nice shifter
    Bought this product to upgrade to 10spd, this shifter with the GX derailleur shifts like butter!!

    Great set up for the cost

    PROS: Easy To Install
    October 22, 2015
    St. Cloud MN
    Just what the Doctor ordered, and I feel Good!
    Service was great and I got this quick and in great packaging

    PROS: only have 26 miles on it but I'm all smiles, Great price, responds quick, clutch a huge plus
    September 1, 2016
    Dallas TX

    Q & A

    Start typing your question and we'll check if it was already asked and answered. Learn More
    Browse 12 questions Browse 12 questions and 49 answers
    Will this work with apex road shifters?
    A shopper on Jul 12, 2017
    BEST ANSWER: yes to my knowledge it will work with any SRAM shifter.
    Will this work with the shimano XT 10spd cassette?
    Chris on Jun 2, 2017
    BEST ANSWER: It should. My understanding is SRAM and Shimano cassettes have the exact same spacing between cogs and thus Shimano cassettes can be used with SRAM derailleurs and vice versa. You will run into problems if you trying using a SRAM derailleur with Shimano shifters (or vice versa) because SRAM and Shimano use different actuation ratios - i.e. the amount of cable pulled or released during a shift

    Hope this helps.
    is the SRAM GX Type 2.1 10 SPD medium cage compatible with 11-36 cogs?
    A shopper on Jun 1, 2017
    BEST ANSWER: Greetings,
    This is compatible with 11-36 cogs. I later extended my cog set up with a Wolf Tooth 42 tooth cog and this derailleur works like a dream. This thing is super smooth and built like a tank.
    Can this be used for 3x10 with long cage ?
    Lew P on Jan 17, 2017
    BEST ANSWER: Yes, as long as you do not exceed 36 teeth on the cassette large cog and total chain wrap of 47 teeth. I currently use an XX rear derailleur on a road triple. The XX is listed as a 2x like the GX.
    Im looking to replace an x9 rear derailleur on my 2013 demo dh bike would this be a good replacement?
    Alastair B on Jul 16, 2017
    BEST ANSWER: Hello,
    I run an x9 on my 29 inch hardtail and my wife runs the GX on hers. They are nearly identical in my opinion and I think you will be happy with it.
    I need to replace my X7 rear derailer. Can I change the X7 RD for the GX without exchanging my shifter? Is this the most comparable derailer to the X7?
    Brad R on Apr 23, 2017
    BEST ANSWER: SRAM 10sp mountain shifters all work with the 10sp derailleurs. I've run X7's and X9's with SRAM shifters and used an X9 with GripShifts before installing the GX. The only difference is the Type II clutch that provides much more chain stability with a 1x10 system which I used.
    I'm currently using a sram X-7 long cage with 3x10 front large ring is 44 I wanted to switch to 2x10 with 33 or 36 front can I use a medium cage with it ?
    A shopper on Jul 23, 2017
    BEST ANSWER: Yes, if the largest cog in your cassette is a 32 or smaller. The SRAM web page for the GX rear derailleur has a link to a pdf compatibility chart if you would like more information.
    Will this work with a SRAM Force road shifter?
    fred r on Jul 1, 2017
    BEST ANSWER: maybe if the actuation is 1;1 it will work, but remember that this one is for mtb, if you planing to set your bike 1 x 10 is good because the it will fit with a 36 cassette and a 50t in front
    Hi there, I am currently running a 11-36 cassette and 22-36 chainrings on the front. My understanding is this combination will require a long cage derailleur, however I am intending on changing my front chainring to a single 30tooth 1x in the near future. Would you be able to advise if there is a cage length which will work for both of these setups? Thanks
    A shopper on Jun 5, 2017
    BEST ANSWER: You shouldn't need a long cage for that particular setup. Get a medium cage.
    Does this GX type 2.1 10-speed work with the 40T sunrace cassette? Having problems with middle cogs but not sure if the Shimano SLX 10-speed shifter I'm using is the problem. It appears that I have the necessary hi/lo deraileur range within the limits.
    James P. on May 9, 2017
    SRAM GX Type 2.1 10 SPD Rear Derailleur
    SRAM GX Type 2.1 10 SPD Rear Derailleur
    Sunrace MX3 10 Speed Cassette
    Sunrace MX3 10 Speed Cassette
    BEST ANSWER: Your shifter is probably the culprit, as it's definitely not compatible. SRAM and Shimano 10-speed systems have a different cable pull ratio. Your best bet is to get a SRAM 10 speed MTB shifter installed, which should work a lot better.
    SRAM GX 2X10 Trigger Shifter
    SRAM GX 2X10 Trigger Shifter
    What's the gear range ? Can it be used on 10 speed 1x drive trains?
    Trail Dog on Jun 3, 2016
    BEST ANSWER: simple answer. yep.

    forum answer:
    Is this a dedicated 2x10 GX derailleur? If so, what is the difference between 1X10 GX and 2x10 GX besides the length of the cage and possibly length of the B-screw (assuming most 1x users go for a 40-42T big cog, however, I am happily running an 11-36 cassette for now)?
    I am looking for a replacement for SRAM X7 derailleur that came as part of a 2x10 drivetrain that was later converted into 1x10.
    seahog on Apr 15, 2016
    BEST ANSWER: simple answer, yep.

    Forum answer:

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    Free Shipping Offer

    Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

    Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.