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Wolf Tooth GC Cog For Shimano

Item #: CG223A06
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Wolf Tooth GC Cog for Shimano

The introduction of 11-36T cassetes a few years ago changed mountain biking forever. The larger gear range made 1x drivetrains more practical, but some found that it still wasn't a wide enough gear range. This add-on cog replaces one of the middle cogs in your 10-speed cassette cluster, giving you an extra-low 40T or 42T granny gear without requiring you to upgrade your entire drivetrain!

Wolf Tooth's GC cassette cog is so big that when machining the first batch, the machinist thought he made a mistake!  If being big is cool then the GC cassette cog is the coolest cog around.  This cog is made with the premium precision and finish one can expect from WTC, and this enables quite possibly the best feeling shift in the cassette. This cassette sprocket is only for use with Shimano brand 10spd XT & XTR cassettes. It is NOT compatible with any other brand or model of cassette.  The shift points are properly timed to the tooth locations on the 36t Shimano cogs for optimal shifting performance. Use of this cassette sprocket requires removal of the 17T or 15T cog & spacer from your cassette.

Note on “B-screw”: A longer screw is almost never needed with SRAM derailleurs and only needed for about 50% of Shimano derailleurs. If you think you might need the longer B-screw, order one separately or just go to your local hardware store and pick up an M4 x 25 socket head cap screw.

You may need a longer chain than what is presently on your bike. Make sure that when shifted to the 40/42T cog, there is still some amount of forward travel possible with the rear derailleur cage. This is especially important on bikes with rear suspension. We have tested with Shimano, KMC & SRAM chains – all function well.

Compatible only with the following Shimano 10spd cassettes:

XT 11-36t (CS-M771)
XTR 11-36t (M980)

Not compatible with SLX 11-36 cassettes because the 17t cog cannot be removed.

Note: the GC 42 is not compatible with 2011 or older SRAM rear derailleurs due to the location of the upper jockey wheel. It is difficult or impossible to get satisfactory shifting with the 2011 or older SRAM rear derailleurs so it is not recommended to use the GC if you have one of these. The GC works great with the newer SRAM rear derailleurs however.

Check out the GC tech page @ Wolf Tooth for more details.

Features:

  • Compatible with Shimano XT 11-36t (CS-M771) and Shimano XT 11-36t (M980) cassettes only.
  • Requires removal of 17T or 15T cog from cassette
  • CNC machined in the USA
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REVIEW SNAPSHOT®

by PowerReviews
Wolf Tooth ComponentsWolf Tooth GC Cog For Shimano
 
4.7

(based on 3 reviews)

Ratings Distribution

  • 5 Stars

     

    (2)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Durable (3)
  • Easy to install (3)

Cons

    Best Uses

    • Mountain biking (3)
      • Reviewer Profile:
      • Casual/ recreational (3)

    Reviewed by 3 customers

    Sort by

    Displaying reviews 1-3

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    5.0

    Perfect for 1x conversion

    By Weekend warrior

    from San Francisco

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Attractive Design
    • Cost
    • Durable
    • Easy To Install
    • Lightweight

    Cons

      Best Uses

      • Mountain Biking

      Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano:

      For going 1x10 it's the perfect gearing for weekend warrior riding. I have paired this with a 32t chainring and I get all the range I need for trail riding. Install was a breeze and it took me all of 15 mins with the right tools.

      Shifting is very smooth paired with XT components. The machining allowed for mating up with my XT cassette perfectly.

      It also works with double chainrings upfront.

      No regrets with the upgrade here.

      • Was this a gift?:
      • No
       
      5.0

      wolf tooth hits a home run

      By Tacols

      from Albuquerque, NM.

      About Me Casual/ Recreational

      Pros

      • Attractive Design
      • Durable
      • Easy To Install
      • Lightweight

      Cons

        Best Uses

        • Mountain Biking

        Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano:

        This has to be the best thing since sliced bread. outstanding climbing performance, easy to install, cool looks.

        • Was this a gift?:
        • Yes
         
        4.0

        Works great but not perfect overall

        By 300lbsgorilla

        from Mid MO

        About Me Casual/ Recreational

        Verified Reviewer

        Pros

        • Durable
        • Easy To Install

        Cons

          Best Uses

          • Mountain Biking
          • Upgrade

          Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano:

          I have the 42 tooth with Shimano drive train. I use an XT shadow derailur and a raceface 30 1X narrow wide ring on a Niner Rip9

          Intallation was easy. Just pull the cassette remove the 17 tooth and put back together. I needed a longer b screw but that was no big deal.

          Once set-up the shifting in and out of this ring was basically flawless. In and out like it was just made to be there. However shifting around the cog that was removed is now a bit more difficult and not as crisp. It is definatly not bad enough to make me want to change to pay for the 1x11 upgrade but it is noticable when shifting just up just one cog. It was worth what I paid no doubt. The price seems to have come up a bit since I got it back in FEB/MARCH time frame but it is still worth it if you want to go to 1x and not a hill climbing whippet.

          It looks good and quite seamless in it appearance. SOme of the people i ride with laugh at me and make fun because I have such large cog but I know it is worth it for me as it is not their bike it is mine and I love the 1x10 set-up.

          • Was this a gift?:
          • No

          Displaying reviews 1-3

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          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.