Results 1 to 8 of 8
  1. #1
    jzt
    jzt is offline
    mtbr member
    Reputation: jzt's Avatar
    Join Date
    Apr 2004
    Posts
    132

    Largest recommended middle chainring for a 22T chainring

    I have a 22-32-bashguard setup currently. I go downhill a lot, so I want a bigger middle chainring for higher speed. I dont' want a big ring because I want to keep the bashguard (accomodates up to 38T).

    the question is: what is the largest recommended chainring that I can pair with my 22T? i'm thinking of 38T but could my front Deore derailleur handle such a big shift? I want to keep the 22T because I need it to get up the steep trails.

  2. #2
    Do It Yourself
    Reputation: Homebrew's Avatar
    Join Date
    Jan 2004
    Posts
    5,722
    14T is probably the biggest jump that you want to take. So that makes it 36T. You could try the 38T but I think you might have some trouble dropping the chain over the 22T. If you went up to a 24T, you could go with the 38T.
    Long Live Long Rides

  3. #3
    mtbr member
    Reputation:
    Join Date
    Mar 2004
    Posts
    55
    I ran a 16t jump ( 20-36) for years without any trouble, so based on that, I'd say your 22-38 will probably work. Note that I was using non-indexed shifters - I don't know if that makes it easier or not.
    I just got new (4 bolt) cranks which won't take a 20, so I may try 22-38 soon. If you try it, please post back here to let us know how well it works.

  4. #4
    Over the Hill
    Reputation: dstepper's Avatar
    Join Date
    Feb 2004
    Posts
    1,671

    20 tooth 4 arm

    http://www.boonerings.com/cr/orderformchainring.html

    It is slightly squared to fit 4 bolt pattern.

    Any one here using one?

  5. #5
    Spring! Spring! Spring!
    Reputation: bear's Avatar
    Join Date
    Feb 2004
    Posts
    5,181
    Depends a bit on the front-d cage design, how much range it has.

    I've a current XT front-d, and running 22-34, and it's fine. 22-36 would probably work too, based upon the clearance that I can see, but more than that could be a problem.

  6. #6
    mtbr member
    Reputation: MikeDee's Avatar
    Join Date
    Nov 2004
    Posts
    1,106
    Quote Originally Posted by dstepper
    http://www.boonerings.com/cr/orderformchainring.html

    It is slightly squared to fit 4 bolt pattern.

    Any one here using one?
    What do you mean by squared (i.e. the ring ain't round)?

  7. #7
    mtbr member
    Reputation: logbiter's Avatar
    Join Date
    Dec 2003
    Posts
    2,819
    I agree, especially for an indexed shifter. it'll also depend on what derailleur you're running.
    You can give it a shot, but it'll probably be finicky.
    I've run 24-36-48 with a mega9 XT, but it was a bit finicky, especially going up to the 48.
    It works much better with an older 8spd XT/XTR or 7/8spd suntour.

    yes, I'm loath to give up my 8spd ways and standard BCD cranks.

    Quote Originally Posted by Homebrew
    14T is probably the biggest jump that you want to take. So that makes it 36T. You could try the 38T but I think you might have some trouble dropping the chain over the 22T. If you went up to a 24T, you could go with the 38T.
    [SIZE=1][/SIZE]

  8. #8
    Over the Hill
    Reputation: dstepper's Avatar
    Join Date
    Feb 2004
    Posts
    1,671

    Correct

    To fit the bolt pattern, the 4 bolt 20 tooth ring is not perfectly round.

    I what to see one?

    I e-mailed Boone a month ago asking them to e-mail me a picture...they never responded. Boone makes quality stuff, but they are a small company.

Similar Threads

  1. middle chainring positioning - is it important?
    By nampla in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 3
    Last Post: 02-20-2005, 03:46 PM
  2. XT M760 crankset/ middle chainring
    By greenfin_demon in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 5
    Last Post: 02-18-2005, 08:30 AM
  3. slow shifting from middle to small chainring
    By gkd in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 1
    Last Post: 04-10-2004, 07:48 AM
  4. Chain Drops From 3rd to middle chainring
    By rkj__ in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 1
    Last Post: 03-02-2004, 10:10 PM

Posting Permissions

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