Advertise on Bikeforums.net



User Tag List

Results 1 to 3 of 3
  1. #1
    Senior Member
    Join Date
    Oct 2008
    Posts
    300
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    MTB frame and road crank for 1x7?

    Trying to use MTB frame and a Bontrager road crank with external bearings. I removed the large chain ring to make it a 1x7. Clearance is an issue as the ring rubs against the chain stay; even after I moved the ring to the outside where the large ring would ordinarily sit.

    Any suggestions? Ebay it and start over with a mountain crank?

  2. #2
    Senior Member
    Join Date
    Oct 2008
    Location
    Ohio
    My Bikes
    Franklin Frames Custom, Rivendell Bombadil, '83 Specialized Stumpjumper
    Posts
    1,289
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Too bad it's an ext. bearing crank, because all you'd need is a longer BB. Yeah, sell it and get a Sugino double or triple.
    http://www.velo-orange.com/suxddocr48.html
    http://www.velo-orange.com/suoldlotr.html

    The double or triple with a 113mm BB, using the 36 would likely work, but it depends on the clearance of your mtb frame. I'm not sure of the 34t of the double would clear. If it's really bowed you may need a 115. You can also use BB spacers in 1, 1.5 or 2mm of you need a bit of clearance on the drive side.

    That's what makes tapered cranks so useful . . tweak-ability

  3. #3
    AEO
    AEO is offline
    Senior Member AEO's Avatar
    Join Date
    Jun 2007
    Location
    A Coffin Called Earth. or Toronto, ON
    My Bikes
    Bianchi, Miyata, Dahon, Rossin
    Posts
    12,255
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    34T inner/middle ring might be very tight clearance for a MTB frame with a road BB.
    my CX bike has bowed chainstays like a MTB and it needs a 110mm axle for a triple, while a shimano 50/34T compact double external BB just barely cleared the chainstay.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

Posting Permissions

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