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  1. #1
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    Single speed gear question?

    Single speed gear question?-025.jpg
    I have seen the SS light!
    So I recently converted my EL mariachi to SS and to try it out I just put a 22 tooth sprocket on the back. The 39/22 ratio works out to be close to 32/18 around 51.4 gear inches. I could put either a 24 or 25 tooth rear cog and achieve close to the recommended 32/20 ratio a lot of people recommend but My question is, is there any real advantage to going with a smaller front chainring and smaller rear cog? TIA

  2. #2
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    Ground clearance.

    SPP
    Rigid.

  3. #3
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    Re: Single speed gear question?

    Smaller rings offer a bit of extra clearance for rocks/logs and a small amount of weight savings.

    Larger ring should wear slightly better, and a lot of people swear they feel smoother. I could see that being the case but never tried a bigger ring.
    Yeah I only carry cans cause I'm a weight weenie.

  4. #4
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    Good point SPP! Thanks

  5. #5
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    I'm currently running 32/18. At some point I'm gonna go 34/18 probably when I get new cranks. I'm iffy about going bigger than 34 for ground clearance that has already been mentioned.
    SS ==> Nut up or Shut up!

  6. #6
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    Quote Originally Posted by Cormac View Post
    I'm currently running 32/18. At some point I'm gonna go 34/18 probably when I get new cranks. I'm iffy about going bigger than 34 for ground clearance that has already been mentioned.
    You won't lose much clearance going from 32 to 34...

    39 is a different story.

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  7. #7
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    Quote Originally Posted by AlexCuse View Post
    Smaller rings offer a bit of extra clearance for rocks/logs and a small amount of weight savings.

    Larger ring should wear slightly better, and a lot of people swear they feel smoother. I could see that being the case but never tried a bigger ring.
    Yes, and larger ring/cogs with same ratio feels smoother to me.
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  8. #8
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    I currently run a 36x22 on 26" wheels. From time to time I have clearance problems going over logs. Every fraction of an inch helps...

  9. #9
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    Quote Originally Posted by SlowPokePete View Post
    You won't lose much clearance going from 32 to 34...

    39 is a different story.

    SPP
    maybe I should look into 36/20? Though from 32 to 36 would be an obvious difference in clearance? I know 32 to 34 would be minimal.
    SS ==> Nut up or Shut up!

  10. #10
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    Quote Originally Posted by p08757 View Post
    Every fraction of an inch helps...
    That's what she said!

    I seriously just bash the logs with your chainring.
    Crossing Logs | Farnsworth Engineering

    I bash logs all the time and my chainring seems fine. Then again my 36 tooth chain ring is a litter wider then most others.
    The MONSTER chain! | Farnsworth Engineering

    I have also seen plenty of people clear pretty crazy high logs on lightweight XC bikes with 42 tooth outer rings and no bash gaurds. If your technique is good you don't really need to worry about much.
    Mark Farnsworth, Raleigh, NC
    http://farnsworthbikes.com

  11. #11
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    Thanks for all the input guys, it looks like 36 tooth is the smallest 120 BCD chainring I can find. So I will wait till I wear this one out and replace it with a 36T. This current combo seems really smooth to me, besides I need to upgrade the cranks on my mukluk so I can run 1X10!

  12. #12
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    Quote Originally Posted by Cormac View Post
    I'm currently running 32/18. At some point I'm gonna go 34/18 probably when I get new cranks. I'm iffy about going bigger than 34 for ground clearance that has already been mentioned.
    How do you like the 32/18?
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    Larger chainring cog combo will definitely be smoother, longer-wearing, heavier, and afford you less ground clearance. Also, something to consider with swinger/slider/track dropouts, the larger combo matches up to chain length differently than a smaller combo.

    It's possible that when you drop down to the 36 chainring, your matching cog might create a gear combo that, given the shortest chain possible, will also move your dropouts more forward. This matters only if you care about slamming your wheel for wheelie antics.
    . . .
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  14. #14
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    Quote Originally Posted by Covi101 View Post
    How do you like the 32/18?
    It's great! Perfect for most of the trails in the area. A 34/18 would be nice for a little more speed on the flats. But I could still climb with it.
    SS ==> Nut up or Shut up!

  15. #15
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    Quote Originally Posted by Forged1 View Post
    Click image for larger version. 

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    I have seen the SS light!
    So I recently converted my EL mariachi to SS and to try it out I just put a 22 tooth sprocket on the back. The 39/22 ratio works out to be close to 32/18 around 51.4 gear inches. I could put either a 24 or 25 tooth rear cog and achieve close to the recommended 32/20 ratio a lot of people recommend but My question is, is there any real advantage to going with a smaller front chainring and smaller rear cog? TIA
    "Gear inches" aside, I wouldn't say the 39/22 is close to the 32/18, which is basically a straight 2:1 ratio(using the 2 teeth over a 26" setup). As far as a 32/20, as always gear choice is based on what you ride and ones individual fitness level. Hard to get a comparative answer unless the question is narrowed down to specific area trail/conditions.

    On the ground clearance, are you going to be riding any different trails with the SS setup than you would not normally be riding with the geared setup? Again something you would know given where you ride. And as for 120bcd, I take it that's your big ring spider dimension? Why not just run a bashring there and get a 34-36t SS specific ring with the cog you have for starters, then adjust down in teeth to where it works. Cogs are cheap.
    Wait,who did he tell you that?....

  16. #16
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    Quote Originally Posted by JMac47 View Post
    "Gear inches" aside, I wouldn't say the 39/22 is close to the 32/18,
    39/22 = 1.77272727 ratio
    32/18 = 1.77777778 ratio

    Pretty much the same.
    Ride more!

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    Ddd
    Last edited by 1SPDBING; 03-16-2014 at 04:52 PM.

  18. #18
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    Quote Originally Posted by asphaltdude View Post
    39/22 = 1.77272727 ratio
    32/18 = 1.77777778 ratio

    Pretty much the same.
    Comes out almost equal in inches, too.

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  19. #19
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    FWIW I currently run 36/18 104 BCD. It's pretty good in the flats but any steep technical stuff I have to push my bike. I have a 32t Surly i've been itching to try lately to see if I like this gear combo any better.

    Crazy thing is I commute on the 36/18 setup to the local YMCA quite frequently. It's a pretty good gear combo. I would just like a little bit more low end sometimes.

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