Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Senior Member tblendell's Avatar
    Join Date
    Mar 2005
    Location
    hollywood, ca.
    My Bikes
    cannondale cross, , tommaso as1, cannondale jekyll
    Posts
    146
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    smallest chainring on compact cranks?

    i'm going to do some touring on my cross bike. right now i have a 36 as my smallest chainring on my truvativ elita compact cranks.
    is a 34 the smallest i can switch it out with?
    also...will i need to readjust the derailleurs? i am NOT a mechanic but i'm sure i could manage just the swap out with the chainring. i think.
    thanks!
    troy

  2. #2
    hello roadfix's Avatar
    Join Date
    May 2003
    Location
    Los Angeles
    My Bikes
    thank you for asking
    Posts
    18,502
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    What cassette are you running now? Perhaps you can get a more noticable difference by swapping to a large cogged cassette rather than swapping rings. 36 to 34 ain't much of a diff.....
    .cinelli.olympic.surly.long.haul.trucker.kona.ku.surly.steamroller.
    .litespeed.classic.litespeed.firenze.bianchi.pista.dean.colonel.plus.more.

  3. #3
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    25,467
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    A 34T chainring is the smallest that will fit on the "standard" 110 mm bolt circle used on all current compact cranks. A 74 mm BCD, used for the granny rings of both road and compact triples, will go down to 24T.

  4. #4
    cycles per second Gonzo Bob's Avatar
    Join Date
    Oct 2003
    Location
    Minnesota
    My Bikes
    Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
    Posts
    1,790
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    33T is the smallest that can go on 110mm BCD but might be tough to find. 34T is much more common. Normally you need to adjust FD height only when you change the big ring. But you may need to fidget with it a bit since you're increasing the difference between the two rings - especially if the FD outer cage is currently more than 2mm above the big ring.

  5. #5
    bicyclist LandLuger's Avatar
    Join Date
    Feb 2006
    Posts
    383
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Gonzo Bob
    33T is the smallest that can go on 110mm BCD but might be tough to find. 34T is much more common. Normally you need to adjust FD height only when you change the big ring. But you may need to fidget with it a bit since you're increasing the difference between the two rings - especially if the FD outer cage is currently more than 2mm above the big ring.
    Harris Cyclery can get the 33T, but not worth the effort over the readily available 34T

  6. #6
    Senior Member DannoXYZ's Avatar
    Join Date
    Jul 2005
    Location
    Saratoga, CA
    Posts
    11,495
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Depending upon the crank-arm design, you may also need to file down the tips of the spiders to clear the 33t chainring...

  7. #7
    fmw
    fmw is offline
    Hoosier Pedaler fmw's Avatar
    Join Date
    Jul 2005
    Posts
    2,432
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've tested both 34 and 36 tooth on the same bike. My preference is for 36 because it is useful for more than just climbing. I found the 34 tooth geared to low for me for anything but climbing. I can cruise along at 17 or 18mph on the 36 tooth and the middle portion of the cassette. Your reaction might be exactly the opposite, of course. It isn't expensive to find out. You can get a 34 tooth ring pretty cheaply on Ebay and stick it on there. Then you'll know.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •