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Wolf Tooth GC Cog For Shimano 10 Speed

Item #: CG223A06
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Wolf Tooth GC Cog For Shimano 10 Speed

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
4.8 / 5.0
43 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
36
5
2
0
0
42t WT and if performs like a champ.
Delivery was fast and on time. Ok, it was a little earlier than expected. That's a good thing.

PROS: Durable, Lightweight, Easy To Install, Attractive Design
March 18, 2015
Location:
Santa Clarita
simple 1x solution
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.

PROS: Attractive Design, Lightweight, Easy To Install
November 7, 2014
Location:
Evergreen, CO
Excellent quality and shifts great
Delivery was good.
May 18, 2016
Location:
Baltimore, MD
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 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.

PROS: Easy To Install, Attractive Design
November 5, 2014
Location:
san antonio, TX
new gear for cheap 1x
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.

PROS: Lightweight, Easy To Install, Attractive Design
March 10, 2015
Location:
Woodstock ga
Makes "Going Up" Easy(r)
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

PROS: Easy To Install

CONS: Expensive
March 16, 2015
Location:
American in the UK
Works as promised and looks good too. Easy to install. Appreciated it in the snow!
December 14, 2016
Purchased
6 months ago
Great for those extra stiff climbs
So far this has been great. Perfect alternative for an 11 speed, much easier and cheaper. The only thing I don't love is the big jump on the lower end of the cog from removing the 15.
November 16, 2016
Location:
Fraser, CO
My 3rd GC
On par with the now defunct Pricepoint.
October 20, 2016
Location:
Putnam Valley, NY
Wolf tooth 40 is all you need.
Install of the 40 tooth cog was a breeze, less then 10 minutes. No need for a big 46 tooth gear with a 32 tooth chainring. Minimal adjustment to the derailleur.
June 8, 2017
Purchased
4 weeks ago
Location:
Myakka city

Q & A

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The Wolftooth website shows different (newer?) version of the 42t cog which has an additional inner structural ring. Which version are you selling?
ShoNuff on Jul 23, 2016

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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.