32x18 vs 34x19. Pros/cons of either?- Mtbr.com
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  1. #1
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    32x18 vs 34x19. Pros/cons of either?

    i'd expect the 34x19 to last slightly longer since more teeth are sharing the load but with the possible drawback of more strikes on log hops. otherwise i can't figure out why one would be better than the other. your opinions?

  2. #2
    Downcountry AF
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    no difference. they're so similar any benefit would be very minimal. yes 34x19 would wear a little slower.

    just for pro/con purposes to add to what you've said: con 34x19 is slightly heavier. see, very minor.

    maybe if it has a very specific application on a certain bike that required a special setup then maybe, but just as one vs the other not a big difference. my .02
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  3. #3
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    Depends on how strong you are.....

    Based on a 29er with a 2.20 rear tire:

    32x18 = 51.4 gear inches

    34x19 = 51.7 gear inches


    Edit: ooops.....copied the wrong column.
    Last edited by mtnbikej; 04-18-2016 at 09:53 AM.
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  4. #4
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    i see 51.4 vs 51.7 for a 2.2.
    With the 2.4's i run, the calculator says 32:18 = 52.1 and 34:19 = 52.4 so in either case, 0.3 inches difference.

  5. #5
    SS Pusher Man
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    Quote Originally Posted by head View Post
    i see 51.4 vs 51.7 for a 2.2.
    With the 2.4's i run, the calculator says 32:18 = 52.1 and 34:19 = 52.4 so in either case, 0.3 inches difference.
    You are right, I looked at the wrong column.


    Look at it the same way as would you a 28x16 vs. 32x18 if the ratio was the same? Bigger ring/cog combinations do offer more chain wrap.

    The whole chainring clearance for logs and such....not such a big deal....honestly the couple of extra mm's aren't gonna make that much of a difference in whether you hit something or not..

    Run which ever combo you want.
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  6. #6
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    If you have sliders... see which combo gives you the best chainstay length.
    http://eehouse.org/fixin/formfmu.php...ey=Stay_length

  7. #7
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    I like the extra wrap and efficiency of bigger rings. They just feel smoother.

  8. #8
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    If you use a prime number of teeth in a cog or sprocket it theoretically evens out the wear.
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  9. #9
    Armature speller
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    Quote Originally Posted by Velobike View Post
    If you use a prime number of teeth in a cog or sprocket it theoretically evens out the wear.
    Only if you're getting uneven wear.

  10. #10
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    Don't you just need the number of rear/front cogs to be relatively prime?

    EDIT: ... to achieve this theoretical, perhaps not practically useful, even-wearing.

  11. #11
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    I've noticed this on my geared bike. When I am on any flattish trail, I like to keep it in the big ring (I still run old-school 3-ring with 44). It just seems to spin so much better. I attributed it to the chain being in a much more neutral state as it wraps around the chaingring, but I didn't think it would be enough to feel. Was wondering if there would be the same effect on SS.

  12. #12
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    Quote Originally Posted by slohr View Post
    I've noticed this on my geared bike. When I am on any flattish trail, I like to keep it in the big ring (I still run old-school 3-ring with 44). It just seems to spin so much better. I attributed it to the chain being in a much more neutral state as it wraps around the chaingring, but I didn't think it would be enough to feel. Was wondering if there would be the same effect on SS.
    I think that is the "smoother" feel mentioned above. I often prefer larger rings within reason.

  13. #13
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    In flat MN where we have short punchy climbs I have been running a 34x19 for a year or so and run a 34x18 for races. I think next year I will move to a 34x17 though, I think I am ready to make that move.

    There are a couple guys here running 36x16 though.
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  14. #14
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    I run 32x20 here but it can get really hilly. I tried 36x22 and liked the smoother pedal cycle but even that much gear change made the ride too tough for my weakness.

  15. #15
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    Short answer: no difference.

    Long answer: minor advantage to 34x19. The Big Ring ‚Äď Mechanical Or Psychological Advantage? | CyclingTips

    Takeaway: don't worry about it.
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