2x10 Chainring Question- Mtbr.com
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  1. #1
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    2x10 Chainring Question

    Wanting to buy a bike with a 2x10 and wondering what chainring to consider?

    I switched to a compact crank 5 years ago, so I am looking at keeping a similar cadence with a smaller chainring group. I'm not wanting to push a 42 or 44, so I am considering either a 39/26 or 38/24 and running an 11-36 the back.

    Question: With the 36 back, is a 24 overkill or could I get by with a 26 on short steep terrain?

    "Age is making sure you can keep steady strokes!"

  2. #2
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    I didn't know there was a 38/24.

    For my 26" I run 42/28 which works fine.
    I have tried the 42/28 on a 29er and it isn't bad, but I definitely drop to the 28T much more often than I did on my 26".

    I believe the 39/26 is ideal for everything. I don't have my 39T yet, I have a XX 39T to run 39/28, but the ring is on backorder, so I have no experience with it. I do feel that the 39T would defintely work better over the 42 based on my experience w/ the 42T...for me atleast for the 29er application. Definitely go with the 36T outback, it is definitely most appropriate for 2x10 regardless of your chainring combo.

    I also mainly deal with short steep climbs and do find the 28T ring to be perfect w/ the 36T outback but since it isn't a native ring combo w/ a 39T..I have to buy the rings seperately to get the ring combos I want

    The good thing about this is that if you buy the 39/26, and want a 28T little ring, it is MUCH cheaper to replace and more available than the 39 if you bought a 42/28!

    Keep an eye out with Blackspire, they are suppose to be releasing 10 speed rings to work appropriately with the 104/64 BCD which opens up crank options considerably, so that is something to consider before making any purchase.
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  3. #3
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    Quote Originally Posted by seattle43
    Wanting to buy a bike with a 2x10 and wondering what chainring to consider?

    I switched to a compact crank 5 years ago, so I am looking at keeping a similar cadence with a smaller chainring group. I'm not wanting to push a 42 or 44, so I am considering either a 39/26 or 38/24 and running an 11-36 the back.

    Question: With the 36 back, is a 24 overkill or could I get by with a 26 on short steep terrain?

    "Age is making sure you can keep steady strokes!"
    What gearing do you have set up on your 26" bike? It's a simple matter to convert over the gearing for 29" wheels. Gearing depends on your terrain and riding style - the difference between 26x36 and 24x36 is roughly 1.5 gear inches, not a huge difference.

  4. #4
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    Gear inches are important, but bike weight I feel has some impact. I ride a 23lb. Blur Carbon. It is setup with SRAM 2x10 42/28 and XX 11-36 cassette. There are really only 2 spots in all of the trails I ride that I use the 28T because it is a very very steep switchback and I have to really tuck and load the rear wheel from slipping. It also depends on my energy level and how many miles I have ridden before I hit the climbs, if its early on, I can make it up in the 42T, but usually don't want to simply because there is an increased chance I may gas out or not be able to keep the crank spinning adaquately to the crest.
    Ibis Ripley LS
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  5. #5
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    Great input

    Exactly the information I am looking for. The bike is a 29er, so carrying a bit more weight. I'm looking at the Specialized Evo 29er, which comes with a 1x10, so I am looking to make a 2x10, yet the spider is unavailable for months to accomodate a 38x24 (same gearing on Epic Expert), so instead of waiting for Specialized I was thinking of buying the X0 Cranks - which are 39x26.

  6. #6
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    I don't know which model EVO you are looking at, but a less expensive fix would be the XX Chainrings for the Specialized.

    http://www.amazon.com/TruVativ-chain.../dp/B002SR1HAU
    Ibis Ripley LS
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  7. #7
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    I just got an X0 crankset for my bike to replace a 2X9 conversion on an XT crank.
    I run a 42/28 with an 11-34 on a 26 inch wheeled bike.
    I love the crank, especially the chainrings. The shifting is flawless plus, it just looks awesome. You'll love it.
    Attached Thumbnails Attached Thumbnails 2x10 Chainring Question-cimg4033.jpg  

    I'm unique, just like everyone else....

  8. #8
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    xx Chainrings

    Tried going that direction, yet the spider on the Evo cranks is not machined out on the tabs to accept the chainrings...go figure!

  9. #9
    Rider and Wrench
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    I just did a conversion on my F/S 29er and put an 11-36T 10 speed out back- and have been playing with some gearing up front 2X wise 24T, 26T, 36T etc... here is a link to it in the drivetrain forum- along with a gearing question I had similar to yours- maybe it will help?

    http://forums.mtbr.com/showthread.php?t=672753

    http://forums.mtbr.com/showthread.php?t=669970
    I Just wish I could ride more!


  10. #10
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    Specialized EVO chainring

    Check the spider on your EVO again. My is machined to accept another chainring, for an easy switch to a 2x10. It just has small spacers that are bolted on to make it look like it is not machined out.
    [

  11. #11
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    Raceface has some nice 10spd cranks coming out.

  12. #12
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    Great Info

    Quote Originally Posted by dubdryver
    I didn't know there was a 38/24.

    For my 26" I run 42/28 which works fine.
    I have tried the 42/28 on a 29er and it isn't bad, but I definitely drop to the 28T much more often than I did on my 26".

    I believe the 39/26 is ideal for everything. I don't have my 39T yet, I have a XX 39T to run 39/28, but the ring is on backorder, so I have no experience with it. I do feel that the 39T would defintely work better over the 42 based on my experience w/ the 42T...for me atleast for the 29er application. Definitely go with the 36T outback, it is definitely most appropriate for 2x10 regardless of your chainring combo.

    I also mainly deal with short steep climbs and do find the 28T ring to be perfect w/ the 36T outback but since it isn't a native ring combo w/ a 39T..I have to buy the rings seperately to get the ring combos I want

    The good thing about this is that if you buy the 39/26, and want a 28T little ring, it is MUCH cheaper to replace and more available than the 39 if you bought a 42/28!

    Keep an eye out with Blackspire, they are suppose to be releasing 10 speed rings to work appropriately with the 104/64 BCD which opens up crank options considerably, so that is something to consider before making any purchase.
    Great info...thank you!

  13. #13
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    You may have saved me $

    Quote Originally Posted by KonaSS
    Check the spider on your EVO again. My is machined to accept another chainring, for an easy switch to a 2x10. It just has small spacers that are bolted on to make it look like it is not machined out.
    Going to the shop today to look at spider - you may have saved me some serious money...thanks!

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