Equivalent rings? 1x10 to ss setup- Mtbr.com
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  1. #1
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    Equivalent rings? 1x10 to ss setup

    Iím setting up my 1st ss. Itís 27.5+. On my 29+ 1x10, I ran all day on 3rd smallest ring which is 32f 15r. Can I get close to the right rings using that data, or will it be completely different. Sorry if this is a stupid question. I havenít had a ss since my kid bike.
    Last edited by slowpoker; 04-22-2018 at 09:27 PM.

  2. #2
    Downcountry AF
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    Yes, you simply need to use a gear inch calculator.

    Sheldon Brown's Bicycle Gear Calculator
    Rigid SS 29er
    SS 29+
    Fat Lefty
    SS cyclocross
    Full Sus 29er (Yuck)

    Stop asking how much it weighs and just go ride it.

  3. #3
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    Quote Originally Posted by *OneSpeed* View Post
    Yes, you simply need to use a gear inch calculator.

    Sheldon Brown's Bicycle Gear Calculator
    Simply? Thanks!

  4. #4
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    That's a pretty big gear. 34/15 is pretty close but more teeth is better so I'd probably go with 36/16 if I wanted that gearing.
    I brake for stinkbugs

  5. #5
    eri
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    Quote Originally Posted by slowpoker View Post
    Simply? Thanks!
    Lots of variance in tires for those two sizes. You need to determine the circumference of the two sized rear wheels. For each - Sit on bike and roll forward one rotation. If they're the same then use same gearing. If the 29+ has 10% bigger circumference then it wants 10% easier gearng for equivalent gear inch.

    Ultimately though I doubt you will be happy with current 'all day' ratio, more fun to go a bit stiffer, then again 32x15 is really high...

  6. #6
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    Thanks, guys. Itís coming with 32/18. Iím guessing that will be way off. Not a lot of major hills in my area.

  7. #7
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    Quote Originally Posted by slowpoker View Post
    Thanks, guys. Itís coming with 32/18. Iím guessing that will be way off. Not a lot of major hills in my area.
    I played with the configurations on bikecalc.com and 32/18 on a 27.5+ is coming in at 51.6 inches for me. Your preferred 32/15 on the 29+ is 56 inches.

    Similar gearing on the 27.5+ would be:

    34/18, 54.8 in
    33/17, 56.2 in
    32/16, 58 in

  8. #8
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    Quote Originally Posted by akindofbrian View Post
    Your preferred 32/15 on the 29+ is 56 inches.
    I missed the fact that they were +sized, using 2.75 as a tire size makes the 29'er nearly 64 gear inches with 32/15. I don't know the rider or his/her trails but if it were me I'd take it for a few rides with the stock gearing and go from there.
    I brake for stinkbugs

  9. #9
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    Quote Originally Posted by J.B. Weld View Post
    I missed the fact that they were +sized, using 2.75 as a tire size makes the 29'er nearly 64 gear inches with 32/15. I don't know the rider or his/her trails but if it were me I'd take it for a few rides with the stock gearing and go from there.
    Right on! I clearly looked at the wrong slot in the gearing table. Oops.

    And 64 is pretty darn tall. More like gravel road gearing than singletrack, but it all depends on what you ride.

  10. #10
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    Quote Originally Posted by akindofbrian View Post
    I played with the configurations on bikecalc.com and 32/18 on a 27.5+ is coming in at 51.6 inches for me. Your preferred 32/15 on the 29+ is 56 inches.

    Similar gearing on the 27.5+ would be:

    34/18, 54.8 in
    33/17, 56.2 in
    32/16, 58 in
    Went with 34/18. Pretty darn close. Just took her out for what I thought would be a short test run and put in 20.2 miles on the trails. Didnít want to stop. Felt perfect. Thanks for the help, fellas.

  11. #11
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    I run normal 29x2.35 tires and 34/20 gearing, but we have some violent climbs around here. Iím okay with spinning on the flats and killing the climbs.
    Salsa Timberjack SS
    -Gears give me headaches

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