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Wolf Tooth GC Cog For Shimano

From USD$65.95 22% off USD$84.95 msrp
Item #: CG223A06
From USD$65.95 22% off USD$84.95 msrp
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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
 
4.8

(based on 26 reviews)

Ratings Distribution

  • 5 Stars

     

    (21)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to install (19)
  • Attractive (16)
  • Durable (12)
  • Lightweight (11)

Cons

No Cons

Best Uses

  • Mountain biking (21)
  • Upgrade (4)
    • Reviewer Profile:
    • Avid cyclist (13), Casual/ recreational (6), Competitive cyclist (5)
    • Was this a gift?:
    • No (21)

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 26 customers

Displaying reviews 1-10

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5.0

Great upgrade

By No Nick name

from The world is my playground

Verified Buyer

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

I have the 42 cog installed on a shimano 10 speed cassette. Shifts very smoothly so far.

 
5.0

Exceptional product

By PC

from Boise, ID

Verified Buyer

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

I started out with a One Up 40t married to my SRAM 1050 cassette. The One Up was leaving metal dust all over my chain after the first ride. After three rides, it was already getting shark-toothed in spots. Awful.

I moved to a Wolf 40t and was immediately impressed with its smooth shifting and durability. I still have the 40t, but after switching to an XT cassette, I moved up to the 42t, and I'm glad I did.

Most of the trails here in Boise have a gut-check climb in them at some point - usually in the beginning. With my XT 2x10 drivetrain, it's nice to have the extra bit of granny gear to get up the steep humps on the some of the trails, and on the days when you're not feeling 100%, this will get you just about anything.

 
5.0

Best made ever

By Pcamach

from Las Vegas

About Me Casual/ Recreational

Verified Buyer

Pros

  • Smooth Ride

Cons

    Best Uses

    • Downhill

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

    Awesome setup with single ring feels like a granny gear

    • Was this a gift?:
    • No
     
    5.0

    works great

    By Dr Dave

    from NY

    About Me Avid Cyclist

    Verified Buyer

    Pros

    • easy to install, shifts smooth

    Cons

      Best Uses

      • Cross Country

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

      There are very steep hills where I ride. This gave me back most of the low gear that I lost going from a triple to a double chainring. The 40 tooth shifts easier than the 42.

      • Was this a gift?:
      • No
       
      4.0

      Nice addition to single chaining setups

      By MD_TX

      from Texas

      About Me Casual/ Recreational

      Verified Buyer

      Pros

      • Attractive Design
      • Easy To Install

      Cons

        Best Uses

        • Mountain Biking

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

        Have a 34t WTC front chainring and wanted to complete the 1x10 setup so went with a 42t blue giant cog in the rear to provide the greatest range of gearing possible. Works great!

        • Was this a gift?:
        • No
         
        5.0

        Wolf Tooth 42 Rocks! 2x10s RIP (Rest In Peace)

        By TU

        from Royal Oak, MI

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Attractive Design
        • Durable
        • Easy To Install
        • Lightweight

        Cons

        • The End Of 2x And 3x

        Best Uses

        • Mountain Biking

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

        I built my wife a 5010 for Christmas, converted a new XT 2x10 drvetrain to 1x10 with Race Face 32T ring and Wolf Tooth 42T cog. It's perfect, she loves the way it shifts (thank you Lee Baldwin). Santa's workshop has a couple XT rings, front shifter/derailleur for sale...Brand new, cheap.

        • Was this a gift?:
        • No
         
        5.0

        This is a great GC Cog...it helps a lot on climb/ up hill!

        By Sal

        from Los Angeles, CA

        About Me Competitive Cyclist

        Verified Buyer

        Pros

        • Attractive Design
        • Durable
        • Easy To Install
        • Lightweight

        Cons

        • Limited Compatibility

        Best Uses

        • Mountain Biking
        • Racing
        • Road Biking
        • Upgrade

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

        This item helps me on climbing . is really good and durable

        • Was this a gift?:
        • No
         
        5.0

        Once you go 1x your hooked

        By Wackywood

        from Salt Lake City

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Attractive Design
        • Durable

        Cons

          Best Uses

          • Mountain Biking
          • Upgrade

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

          This is a great way to drop weight and simplify your ride.

          • Was this a gift?:
          • No
           
          5.0

          40 t wolf

          By tom

          from N AL

          About Me Avid Cyclist

          Verified Buyer

          Pros

          • Easy To Install

          Cons

            Best Uses

            • Mountain Biking

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

            I installed this in a 9 spd mtb with a 30t ring gear. Had to use a 9 spd chain but it worked better than I expected.

            • Was this a gift?:
            • No
             
            5.0

            Wolf 40 tooth cog is awesome!

            By downtown jerry brown

            from Englewood Colorado

            About Me Competitive 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:

              Great for 1x10 setup.

              • Was this a gift?:
              • No

              Displaying reviews 1-10

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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.