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  1. #1
    Senior Member
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    what chainring/cog ratio is everybody running?

    i have on a 38/18 which is perfect for flat ground but on long or steep climbs it tends to be difficult. might go with 36/18...

  2. #2
    I am a lonely visitor RegularGuy's Avatar
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    I got all the parts together and Monday I'm going to build RegularBike with a 36/18. I can't tell you how it will work though. In fact, having an appropriate gear ratio is the thing that makes me most nervous about going singlespeed.
    Religion is a good thing for good people and a bad thing for bad people. --H. Richard Niebuhr

  3. #3
    Zippy Engineer Waldo's Avatar
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    I'm running a 36/18. Fortunately it is pretty flat around here so that works out quite well.

  4. #4
    Senior Member danr's Avatar
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    I'm running 34/17, or 2 to 1 as it is commonly known.

    Right now, I've got knobbies on my ss. When those wear out, I'll probably get semi-slicks. When I do, I'll probably switch to 34/16. I use the bike for mostly around town and I usually won't hit the single track unless its dry.
    Does the perfect bike really exist?

  5. #5
    sandcruiser thbirks's Avatar
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    Currently using 40/20 combo. a 2:1 ratio is a good starting point but what you run really depends on your topography, terrain and fitness level. Singlespeeding is a compromise. If you pick a ratio that can get you up the hill easily then you'll be spinning like a madman just to maintain speed going back down the hill. Experimenting with ratios is fun and relatively inexpensive.
    "only on a BIKE"

  6. #6
    BFSSFG old timer riderx's Avatar
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    34x17 for my mountain bike
    42x17 for my 700c fixed gear
    44x17 for my 26" commuter/utility bike
    Single Speed Outlaw
    Riding Bikes and Drinking Beer.

  7. #7
    0^0 fubar5's Avatar
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    Originally posted by riderx
    34x17 for my mountain bike
    42x17 for my 700c fixed gear
    44x17 for my 26" commuter/utility bike

    Whats up riderx? Long time no see!!!

    I've got a 39/16 on my commuter SS. I also ride it off road, but the 36/19 is a little tough for that. Even on teh road, I'm not spinning as fast as I'd like to. I may go for a 39/18 and see how that works. Whatever ratio I use, I have to keep it 2:1 plus an odd number. Like right now it's 2:1 plus 7, with 39/18 it would be 2:1 plus 3. Having and odd number seems to keep the chain tension right with out having to go to a tensioner.
    Booyah!!

  8. #8
    BFSSFG old timer riderx's Avatar
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    Originally posted by fubar5
    Whats up riderx? Long time no see!!!

    I've got a 39/16 on my commuter SS. I also ride it off road, but the 36/19 is a little tough for that. Even on teh road, I'm not spinning as fast as I'd like to. I may go for a 39/18 and see how that works. Whatever ratio I use, I have to keep it 2:1 plus an odd number. Like right now it's 2:1 plus 7, with 39/18 it would be 2:1 plus 3. Having and odd number seems to keep the chain tension right with out having to go to a tensioner.
    Fubar - Glad to see you got bitten by the SS bug. I've been busy lately and just haven't had the time to post like I used to.

    A few people have told me the "rule of 4" works good for gearing changes once you find a cog/chainring combo that works. Add the number of Cog and chainring teeth togther - in your case 39+16=55. Add or subtract 4 teeth from this total or multiples of 4 and you should have a usable gear. If you try it, let me know if it works.
    Single Speed Outlaw
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  9. #9
    0^0 fubar5's Avatar
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    Is that rule for vertical dropouts? Or just finding a good gear?
    Booyah!!

  10. #10
    0^0 fubar5's Avatar
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    Actually, after thinking about it, it would work for me.. The biggest problem I have run into is chainring sizes, a 35 would be a good one. As long as I maintain the 2:1 plus an odd number gear I'm ok. 16+16=32, 39-32=7, or 18+18=36, 39-36=3. If I was looking for a big gear using the rule of four, I could do a 39/12, which would give me 2:1 plus 11!!! almost 3:1! Or I could go 39/20, which I think would be waaaay to easy. I had a 28/14 while I was doing fixed gear, and spinning that sucker was tough!! I have one hill during my commute though, and it barley makes the cut as a hill.
    Booyah!!

  11. #11
    BFSSFG old timer riderx's Avatar
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    Originally posted by fubar5
    Is that rule for vertical dropouts? Or just finding a good gear?
    Vert. drop outs. Once you find one that works w/o a tensioner use the rule of 4 to find other combos that will work. Or so I'm told
    Single Speed Outlaw
    Riding Bikes and Drinking Beer.

  12. #12
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    i know one speed, i ride a 26 cruzer with 700 wheelset, with 50 chainring and 17 cog. with 167.5 crankarms. with the short arms less spin, 50 chainring gets going down hills fast, and on flats should not spin out. beside when riding with roadies they look at you like you are monster. and wonder how you do it.

  13. #13
    Mr. Cellophane RainmanP's Avatar
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    This is interesting. I thought I was running a pretty low gear on my fixie at 39/17. I'm not familiar with the 2:1 concept. Maybe I should put a 19 on back. It is flat here so I'm not worried about having low enough gear, but my primary objective of riding a fixie is spinning. On my ss freewheel I have 48/18 for more all around use. All of my bikes are commuters. Lately, I have mostly been riding the fg.
    If it ain't broke, mess with it anyway!

  14. #14
    BFSSFG old timer riderx's Avatar
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    Originally posted by RainmanP
    I'm not familiar with the 2:1 concept.
    The 2:1 concept is for off-road riding. On the road it is way too small, especially on a fixed-gear.
    Single Speed Outlaw
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  15. #15
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    I'm running mostly a 42/16 now on my fixed gear (although the flip-flop hub also has an 18 tooth freewheel on it currently), but I usually run a 50/16 combo in the summer.
    Je vais à vélo, donc je suis!

  16. #16
    Carfree Retro Grouch hayneda's Avatar
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    I most often run 42x16 on my fixed gear. However, I change up quite a bit depending upon what I'm going to be riding. I just did a hilly 200k brevet with a 45x17 and I was a bit over geared. For general road riding, I think a 70 inch main gear with a 60-65 inch bailout hill gear on the flip side is a pretty good setup for me.

    Dave
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  17. #17
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    40 x 15 on my 700c fixed commuter. The hills are predictable but the wind isn't...

  18. #18
    JDP
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    2:1 on my ATB. I leave my commuter in about a 3:1 ratio even though I have a shifter that hardly gets used.

  19. #19
    Spawn of Satan
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    This time of the year I run a 42 x 16 with 172.5 crank arms (I am 6' 5"). It is fairly flat where I am and this allows me to spin around 90-100 rpm most of the time. I live in Michigan and there is still snow on the ground and salt on the roads. For training and lack of cleaning, my fixed gear gets all the miles this time of the year.


    After I get in shape, like around June-July I put on 48 x 16 or 15 with 175 arms. This gets me going a little better.

  20. #20
    Senior Member serpico317's Avatar
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    I run a 42-16 on my commuter. It is a little tall for some of the steep hills around here, but Overall it's a good ratio. On my mtb I run a 32-18, 32-16 depending on where i'm going to ride. I look at it this way, if it's to steep I can always walk.

  21. #21
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    49/17 with 165 arms on my pursuit bike, 44/16 with 170 arms on my 700c track, and 44/16 with 180s on my BMX.

  22. #22
    Friend of Jimmy K naisme's Avatar
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    I feel really odd here. I'm running big guns. 52 engagement rings with a 20 all the way down to 15 on three different bikes. I use Surly flip/flop hubs so one will be like the 16 and the other will be an 18 or a 20. I'm riding the 18 more right now to get my spin back, then in a couple weeks I'll be riding the hell out of those 16 and 15. I like to draft the posers, it irritates the hell out of them, specially when it's my turn to pull, and they see I'm grinding on one gear with no brake. I eat hills on these bikes, course the one hill that makes me wanna puke on a geared bike, I haven't even attempted on my fixies.
    "I will remain the stranger who came from a faraway land." Lance Armstrong

    "The more you drive, the less intelligent you become." Miller "Repo Man"

  23. #23
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    Y'all have some odd ratios. I'll stick with my 48/16 3:1. Nice and even math.

    -Andy

  24. #24
    Honking drivers see you noriel's Avatar
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    I run a 48/16 on my fixed commuter. Houston's pretty flat, but I want to go with a 18t cog so I can spin a little more. My SS mtb is 32/16, but I want to change that because I spinn a little too fast when I use it on the street. I'm using a vertical dropout on the mtb, so I'll experiment a little.
    Noriel
    ----------------
    Geared-->SS-->Fixie.
    Somewhere between I got a dual slalom and mod trials bike.
    I think I'm through with derailleurs.
    I guess uni's are my next step.

  25. #25
    Dismount Run Remount etc. 12XU's Avatar
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    A 2 1/2 year bump. Way to dig that one up!

    Track:
    49x15
    48x16

    Road:
    42x16
    49x18

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