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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
 
4.6

(based on 12 reviews)

Ratings Distribution

  • 5 Stars

     

    (8)

  • 4 Stars

     

    (3)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to install (10)
  • Attractive (8)
  • Lightweight (7)
  • Durable (6)

Cons

    Best Uses

    • Mountain biking (11)
      • Reviewer Profile:
      • Avid cyclist (6), Casual/ recreational (4)
      • Was this a gift?:
      • No (10)

    Most Liked Positive Review

     

    1x10 setup

    I have this installed on my 2010 enduro with a 34t up front and XT deraileur with one up cage. It is absolutely smooth to shift into, easy to set up (at least...Read complete review

    I have this installed on my 2010 enduro with a 34t up front and XT deraileur with one up cage. It is absolutely smooth to shift into, easy to set up (at least for me), and i never dropped a chain or had it drop a gear down. I also am running it with a SLX casette, i just removed the 11t and it works well for my trails and style. Not too heavy as well. Quality is top notch too. I highly recommend this item if you decide to go the 1x10 setup.

    VS

    Most Liked Negative Review

     

    Wolf 40T GC

    3 stars to due install issue 40GC on a new freehub. I actually own both 40GC and 42GC. The 42GC slipped on perfectly but the 40GC required extra english to install. It does...Read complete review

    3 stars to due install issue 40GC on a new freehub. I actually own both 40GC and 42GC. The 42GC slipped on perfectly but the 40GC required extra english to install. It does not go on freely, the tolerances must be off or not cut properly. Tried both GC's on three freehubs, 1 new aluminum Stan's, 2 steel Stan's, 1 used and other new, absolutely no galling from cassette because its steel. 40GC was extremely difficult to install. !@#$%!!!!!

    Reviewed by 12 customers

    Sort by

    Displaying reviews 1-10

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    (1 of 1 customers found this review helpful)

     
    5.0

    42t WT and if performs like a champ.

    By Hopper Bunny

    from Santa Clarita, CA

    About Me Avid Cyclist

    Verified Buyer

    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 product works like a dream. I paired it with a race face 32t cog and a shimano xt rd.

      (1 of 1 customers found this review helpful)

       
      4.0

      Makes "Going Up" Easy(r)

      By Troy

      from American in the UK

      About Me Competitive Cyclist

      Verified Buyer

      Pros

      • Easy To Install

      Cons

      • Expensive

      Best Uses

      • Mountain Biking

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

      The 42t Wolf Tooth cog is very easy to install but adjusting the rear derailleur was a little challenging. Having to remove the 17t cog has made shifting from the 15t to the 19t not as smooth as before.

      Setup
      SRAM XX crankset/chainrings (39/26)
      SRAM XX Rear Derailleur
      SRAM 10-sp chain
      Shimano XT Cassette

      • Was this a gift?:
      • No

      (1 of 1 customers found this review helpful)

       
      5.0

      new gear for cheap 1x

      By trying to keep up

      from Woodstock ga

      About Me Casual/ Recreational

      Verified Buyer

      Pros

      • Attractive Design
      • Easy To Install
      • Lightweight

      Cons

        Best Uses

        • Mountain Biking

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

        The GC went on with no problems xt 11-36 cassette and xt Rd.I got the longer b screw but didn't need it.only three rides but shifts smooth up or down no issues.not quite a granny gear but still pretty low with a 32 ring gear.would definitely recommend.

        • Was this a gift?:
        • No

        (1 of 1 customers found this review helpful)

         
        3.0

        Wolf 40T GC

        By D

        from PA

        About Me Avid Cyclist

        Verified Reviewer

        Pros

        • Attractive Design
        • Durable
        • Lightweight

        Cons

        • Difficult To Install

        Best Uses

        • Mountain Biking

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

        3 stars to due install issue 40GC on a new freehub. I actually own both 40GC and 42GC. The 42GC slipped on perfectly but the 40GC required extra english to install. It does not go on freely, the tolerances must be off or not cut properly. Tried both GC's on three freehubs, 1 new aluminum Stan's, 2 steel Stan's, 1 used and other new, absolutely no galling from cassette because its steel. 40GC was extremely difficult to install. !@#$%!!!!!

        • Was this a gift?:
        • No

        (1 of 1 customers found this review helpful)

         
        5.0

        simple 1x solution

        By ofrdbykr

        from Evergreen, CO

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Attractive Design
        • Easy To Install
        • Lightweight

        Cons

          Best Uses

          • Mountain Biking

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

          Great option to get a 1x drivetrain without the high cost of XO1 or similar. Had a Shimano 2x drivetrain, but wanted to try a 1x setup. I initially just ditched my front derailleur, but missed the low gears for steep, long climb here in CO. The WTC 40T cog did the trick. Wanted the red cog to match my handlebars and add a bit of bling, but settled for the black as it was in stock.

          • Was this a gift?:
          • No

          (1 of 1 customers found this review helpful)

           
          5.0

          1x10 setup

          By yutarosan.guam

          from San Antonio TX

          About Me Avid Cyclist

          Verified Buyer

          Pros

          • Attractive Design
          • Easy To Install

          Cons

            Best Uses

            • Mountain Biking

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

            I have this installed on my 2010 enduro with a 34t up front and XT deraileur with one up cage. It is absolutely smooth to shift into, easy to set up (at least for me), and i never dropped a chain or had it drop a gear down. I also am running it with a SLX casette, i just removed the 11t and it works well for my trails and style. Not too heavy as well. Quality is top notch too. I highly recommend this item if you decide to go the 1x10 setup.

            • Was this a gift?:
            • No
             
            4.0

            Torque it up!

            By brazosshooter

            from North Texas

            About Me Avid Cyclist

            Verified Buyer

            Pros

            • Attractive Design
            • Durable
            • Easy To Install
            • Lightweight

            Cons

              Best Uses

              • Mountain Biking

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

              Installed this as part of converting my 3x10 drivetrain to 1x10. This item was very easy to install and works with no problem. Did not need to replace the B screw on my SLX derailleur. Shifting is seamless and smooth. Only minor complaint is that I do notice the missing cog that this replaced when using the higher gears - I can see why the competitor includes a replacement to smooth that out. However, on the trails that I ride in this area it is rare that I am in those gears anyway.

              • Was this a gift?:
              • No
               
              5.0

              Great extended gear

              By JamesBanta

              from Charlotte, NC

              About Me Avid Cyclist

              Verified Buyer

              Pros

                Cons

                  Best Uses

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

                    WolfTooth makes great products...great quality. After using this to go 1x10, I would never go back to my old 2x setup.

                    The only thing missing from this kit is a 16T replacement gear. Some kits like OneUP provide this with their kit for the same price.

                    • Was this a gift?:
                    • No
                     
                    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

                      Used it on my 29er

                      By Glenn

                      from Sydney, Australia

                      About Me Competitive Cyclist

                      Verified Buyer

                      Pros

                      • Easy To Install

                      Cons

                        Best Uses

                        • Mountain Biking

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

                        I used this as an extra cog for my 29er for steep hills. Works really well with Shimano rear cassette. I dropped off the 11tooth cog and instead used a 13 tooth cog as a first position cog. You will have less top end pedal speed but you can still get to around 45kph before needing gravity to go faster using a 42 tooth front ring.

                        • Was this a gift?:
                        • No

                        Displaying reviews 1-10

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