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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

REVIEW SNAPSHOT®

by PowerReviews
Wolf Tooth ComponentsWolf Tooth GC Cog For Shimano 10 Speed
 
4.8

(based on 38 reviews)

Ratings Distribution

  • 5 Stars

     

    (31)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (2)

  • 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

 

Careful if buying the blue version

Great quality product, the machining of it just looks incredible. However am pretty disappointed with the color shown (the light blue, almost turquoise) vs what i received (a much dark blue,...Read complete review

Great quality product, the machining of it just looks incredible. However am pretty disappointed with the color shown (the light blue, almost turquoise) vs what i received (a much dark blue, almost like a royal blue). Hate to gripe about color, but was truly disappointed as the blue shown would have matched my wheel-set perfectly instead of the blue I received. Contacted Jenson about this and they said it was unfortunately due to way the light was reflected in the photo that made it appear to be lighter. Having tried various angles, i still couldn't get anything close to the lighter blue. Also one of biggest influences of me buying this was a review on here that displayed pictures of theirs in the light blue color and in that photo it looks just like the color in photo on here. So not really sure what happened, still a little confused on if there is two shades of blue offered by wolftooth, but I guess Jenson doesn't carry two shades. I just wanted to write this to let yall know if you guys are considering buying the blue, as to my eyes it is completely different than what the photo suggest. Will do my best to add a photo for comparison (not really sure how yet)

Overall Jenson handled it pretty cool and offered me a chance to return it. Unfortunately, I had just converted my bike to a 1x10 and in doing so had to practically destroy my previous x-9 derailleur in order to get it off (stripped threads so had to drill it out). Because of this, i couldn't go back to my previous set up and couldn't wait till next week to get a possible replacement in black ( have a 3- day riding vacation planned this weekend) . So yea, had to run with the off blue which kindof tears me apart inside as i am only left to image how much faster i could be going with a matching bike

Reviewed by 38 customers

Displaying reviews 1-10

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5.0

Great for those extra stiff climbs

By Mike

from Fraser, CO

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

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.

 
5.0

My 3rd GC

By Sam

from NY

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

Good mud shedding ability, works well. I broke off a tooth from rough riding but that's tycal wear & tear. I noticed the blue color hue has changed; I like the older lighter aqua color better.

 
5.0

Wolf Granny Gear is a great product

By Scottyroo

from So Cal

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

The wolf cog worked perfect on my sons xtr wheels! We made a custom 1x10 set up and the granny gear was a perfect addition.

 
5.0

Awesome product.

By ROYPNOY

from Elk Grove CA

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

Works great on my XT 10 speed cassette. Makes climbing a breeze.

 
4.0

Great climbing ring for 10speed cassette

By D.Y.

from Fairfax Va.

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

Takes less than ten minutes to set up and have bike shifting properly. Your bike will be a climbing machine.

 
5.0

Very nice, just what I needed

By Tim Fu

from Lakewood, Wa

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

Easy to install, works great

(2 of 3 customers found this review helpful)

 
3.0

Careful if buying the blue version

By Nartar

from AZ

Verified Reviewer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

Great quality product, the machining of it just looks incredible. However am pretty disappointed with the color shown (the light blue, almost turquoise) vs what i received (a much dark blue, almost like a royal blue). Hate to gripe about color, but was truly disappointed as the blue shown would have matched my wheel-set perfectly instead of the blue I received. Contacted Jenson about this and they said it was unfortunately due to way the light was reflected in the photo that made it appear to be lighter. Having tried various angles, i still couldn't get anything close to the lighter blue. Also one of biggest influences of me buying this was a review on here that displayed pictures of theirs in the light blue color and in that photo it looks just like the color in photo on here. So not really sure what happened, still a little confused on if there is two shades of blue offered by wolftooth, but I guess Jenson doesn't carry two shades. I just wanted to write this to let yall know if you guys are considering buying the blue, as to my eyes it is completely different than what the photo suggest. Will do my best to add a photo for comparison (not really sure how yet)

Overall Jenson handled it pretty cool and offered me a chance to return it. Unfortunately, I had just converted my bike to a 1x10 and in doing so had to practically destroy my previous x-9 derailleur in order to get it off (stripped threads so had to drill it out). Because of this, i couldn't go back to my previous set up and couldn't wait till next week to get a possible replacement in black ( have a 3- day riding vacation planned this weekend) . So yea, had to run with the off blue which kindof tears me apart inside as i am only left to image how much faster i could be going with a matching bike

 
5.0

great product

By Michael

from Canada

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

works perfectly with my new shimano 1X10 setup.

 
5.0

Great upgrade for a 1 x 10 conversion

By Luijo

from Santo Domingo, DR.

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

I just turn my Niner Rip 9 to a 1 x 10 drivetrain conversion, combining this Wolf Tooth 42T Cog for my 10 speed Shimano Cassette, along with a 16T Cog for a smooth gear shifting transition. Perfect for climbing. Highly recommended.

 
5.0

Climbs like a scalded dog!

By Chris

from Monument, CO

Verified Buyer

Comments about Wolf Tooth Components Wolf Tooth GC Cog For Shimano 10 Speed:

Conbined with a 28 in the front this thing lets you climb anything! Gorgeous machining!

Displaying reviews 1-10

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Do you have questions about this product?

Get answers from real customers and in-house experts with AnswerBox.

2 Questions | 0 Answers
Displaying questions 1-2
  • Q:

    fit on 11/34 9speed cassette ??
    Asked on 11/12/2016 by Julien from Quebec

    0 answers

  • Q:

    The Wolftooth website shows different (newer?) version of the 42t cog which has an additional inner structural ring. Which version are you selling?
    Asked on 7/23/2016 by Shonuff

    0 answers

Displaying questions 1-2

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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.