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36t vs 38t

Discussion in 'Downhill & Freeride' started by max.broman, Oct 16, 2011.

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  1. max.broman

    max.broman Chimp

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    So I can't decide if I want to go with a 36 or 38 tooth chainring on my DH bike. I do also do some trail, AM riding, so i'm thinking 36, maybe even a 34? What do you say?
     

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  2. Lelandjt

    Lelandjt Turbo Monkey

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    Hard to say. Depends on what cassette you're using and how low a gear you need for climbs. Also depends how fast you need to go. My DH bike uses a 12-25 cassette with 39T ring during the season and a 35T ring during the off-season when I have to climb a lot and I won't be going as fast.
     
  3. max.broman

    max.broman Chimp

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    Yeah I was thinking about getting both, or maybe like a 34 and 38.
     
  4. dexterq20

    dexterq20 Turbo Monkey

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    I swapped from a 38 to a 36 (on a 12-27 cassette) this past summer and was glad I made the switch. I found I wasn't using all of my gears with the 38 tooth. With the 36 I can utilize the full range of my cassette. Plus I gained more ground clearance.
     
  5. max.broman

    max.broman Chimp

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    Alright thanks. I might go 36 at first, and see how I like that.
     
  6. no skid marks

    no skid marks Monkey

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    36 is better pick, but if you ride fast tracks mainly, you'll end up burning out your lil 11 tooth sprocket, and wearing chain prematurely. Doubtful this will be the case.
     
  7. max.broman

    max.broman Chimp

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    Haha, yeah I'm not THAT fast.
     
  8. freeridefool

    freeridefool Monkey

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    I dropped from a 36 to a 34 this year. I didnt think I would like it, but like someone else said, I now find I use my whole cassette more often. Im dont know if Im just becoming a better rider but I find I shift way more now too. Im more of a spin to win rather than a power pedaler tho. With the smaller gear up front I can be lower on my cassette, keeping the gear that works best with the cadence I like.
     
  9. no skid marks

    no skid marks Monkey

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    What bike is it for? Chainring size might effect anti squat etc a touch.
     
  10. norbar

    norbar Turbo Monkey

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    THIS!

    Though for trail riding I'd go smaller. I use a 38T + a road casette and pedaling the in between parts in PDS/Morzine was a bitch.
     
  11. Trekrules

    Trekrules Turbo Monkey

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    Is a 34t or 36t chainring with a 12-23t cassette enought for trail riding and some XC stuff on my AM bike?
     
  12. IH8Rice

    IH8Rice I'm Mr. Negative! I Fail!

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    i went from 36t to a 33t w/ a 11-25 cassette and love it as well

    12-23t would be pretty small for trails by me.
     
  13. Lelandjt

    Lelandjt Turbo Monkey

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    ^Yeah. For non-racers I spec a 28T cassette to provide some climbing range. On my race bike I think a 25T is a good compromise between close steps and having a little range. 23T seems "chairlift only".
     
  14. -BB-

    -BB- I broke all the rules, but somehow still became mo

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    Interesting to see what people are running. I have always used a 40t up front, but with an 11-32 or even 11-34 in back.

    A lot of what I ride though will have steep non technical fire road stuff in between tight tech stuff, so I always found myself spinning out with the smaller 36t setups. Shoot, I use a 36 on my trail bike.

    Back to the dh bike though, the use of the 34 lets me do small climbs if needed, or if I need to get from one side of the Mtn to another (certain lifts might only run on weekends) I like having that bigger ring in back.
    Some shuttle spots will also still have a small climb to get to the top of the trail and the 34t in back really comes in handy.
     
  15. -BB-

    -BB- I broke all the rules, but somehow still became mo

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    I never understood the need for a "close step". We have such range in our legs that I can still find an appropriate gear even in my 12-34 or 11-34s
     
  16. Trekrules

    Trekrules Turbo Monkey

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    IH8Rice so 12-23 is too small for trail riding,will the 34 or 36 chainring setup work with the larger cassette like a 11-34?
     
  17. IH8Rice

    IH8Rice I'm Mr. Negative! I Fail!

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    well i dont know how the trails are in the Netherlands, but around here it wouldnt work at all....it might work for a DH bike
    i use a 32t up front and a 11-34 cassette but will be switching to a 34t soon and i find that perfect
     
  18. Transcend

    Transcend My Nuts Are Flat

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    Are you serious?
     
  19. IH8Rice

    IH8Rice I'm Mr. Negative! I Fail!

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    thats a big boy's setup
     
  20. Trekrules

    Trekrules Turbo Monkey

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    My question was more of a general question,i don't always ride trails in the Netherlands but in Germany i do the most of my trail riding with bigger hills than in my own country
     
  21. Carcinogen

    Carcinogen Chimp

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    I run a 38t on the front & 11-34 out back. I really don't want to pedal my bike up anything that takes more than a 1:1 ratio though.
     
  22. Lelandjt

    Lelandjt Turbo Monkey

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    Yup. 7 speed cassette. I find that an 11 tooth cog doesn't hold the chain well when applying a lot of power while going fast over bumps. The 39T ring is cuz I was going from 170 to 165 cranks, needed a new ring anyway, and wanted to keep the same feel. When this cassette wears out I think I'll make a 12-25 6speed.
     
  23. HAB

    HAB Chelsea from Seattle

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    :confused:

    I run a 37t ring with an 11-25 cassette. Seems pretty similar, and not that weird. I guess he's got a little tighter range than I do on both ends, but not by much.
     
  24. no skid marks

    no skid marks Monkey

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    Me neither. I find bigger changes per gear much better.
     
  25. HAB

    HAB Chelsea from Seattle

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    Yeah, I've been toying with the idea of going to something like a 11-25 5 speed setup, just haven't ever gotten around to it.
     
  26. Lelandjt

    Lelandjt Turbo Monkey

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    ^You have to ditch the 11T if you want the added benefit of improved chainline when going to a cut down cassette. The 11T fits on the freehub body differently than the other cogs and needs to be in the outermost position. I use spacers on either side of my cassette so the gears are in the middle.
     
  27. IH8Rice

    IH8Rice I'm Mr. Negative! I Fail!

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    what do you use for spacers?
     
  28. Lelandjt

    Lelandjt Turbo Monkey

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    Spacers that are marketed for using a singlespeed cog on a standard freehub body. I think they came from Problemsolvers. Longer limit screws for the derailleur came from the hardware store.

    Hey OP, take me to the Motherland cuz you've been high-jacked!
     
    #28 -   Oct 17, 2011
    Last edited: Oct 17, 2011
  29. Uncle Cliffy

    Uncle Cliffy Turbo Monkey

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    My setup exactly, and it works great where I ride.
     
  30. freeridefool

    freeridefool Monkey

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    Because I rely on cadence. Im not a huge guy but I pedal like one cause I know what cadence I want regardless of the terrain. If Im just throwing in two cranks, its still my normal cadence. I dont have the huge leg strengh to start slow in a gear and spin it out. I snap through gears.
     
  31. no skid marks

    no skid marks Monkey

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    I'd be curious to see say a 200 meter downhill run into a slight up hill timed with a tight gear ratio cassette Vs a bigger gapped cassette with less changes used to see what was quickest.
    So Less shifts with poorer gear choice Vs more shifts with closer to perfect cadence.
     
  32. freeridefool

    freeridefool Monkey

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    I think the difference would be small if any difference at all. Its more about what your comfortable with. When Im in race mode, I dont want to have to think about shifting and what gear im in. I just want it to happen.
     
  33. no skid marks

    no skid marks Monkey

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    Not sure what you're saying. For me that means higher spaced gear, where it's obvious, and each shift makes a tangible difference to suit what track variants(often extreme)may offer quickly.
    Close shifts take too long so you end up in equally as wrong gear as you are with having larger spaced gears that aren't theoretically perfect.
     
  34. marshalolson

    marshalolson Turbo Monkey

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    run a shifter where you can upshift more than 1 cog at a time?
     
  35. descente

    descente Monkey

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    i like how easy it is to shift with road cassettes. i had a 11-25 and 38T on my last bike and loved it. if you are used to standing and pedaling all the time (IE you are a single speeder) then it really isn't that bad. i've got 11-28? 38T on my new bike and its a little nicer simply cause its a 10 speed and the shifts are just as smooth but a little more range. its the same cassette i had with a 28 added. it works good cause i now live in a place with a little bigger hills. i'm actually thinking about going with a 36T front just for a little better ground clearance, and cause i can't remember the last time i revved out in top gear anyway.
     
  36. djjohnr

    djjohnr Turbo Monkey

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    38/12-27 on my current bike. Tried a 36 for fire road climbing but I got too much monkey motion.
     
  37. Commencal-guy

    Commencal-guy Monkey

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    I think whats more important than a 36T or a 38T is the fact how much chain growth the bike has. I'd rather run a slightly larger ring up front to compensate for the growth.
     
  38. Kntr

    Kntr Turbo Monkey

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    FR Hammerschmidt and XT 11-34 on my DH bike. I run the larger 24t on the Hammerschmidt, which is 36t in OD. I pedal out of the 36t sometimes. I wish it was a 38t on certain trails.