Advertise on Bikeforums.net



User Tag List

Results 1 to 3 of 3
  1. #1
    Senior Member w98seeng's Avatar
    Join Date
    May 2008
    Location
    Incognito
    Posts
    385
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Frame Alignment Question

    I have an 80's Bianchi frame and I am in the middle of rebuilding it. I have checked the rear triangle alignment with the string method. I tied a string from one rear dropout up and around the head tube, down around to the other rear dropout.

    I then measure the distance from the seat tube to the string. I measured 32mm on the left side and 36mm on the right.


    I know I can adjust the frame as found here, should I? Is 4mm enough to cause a problem riding the bike? Is the amount it is out necessitate spreading the rear triangle?
    http://www.sheldonbrown.com/frame-spacing.html

    Also, the bend in the rear dropouts, how do I tell if the angle is correct? I presume the dropout has to be parallel to the centerline of the bike. I do not have any tools to measure this and I really can't afford to buy any. Are there methods to check alignment at home using string, a building square, a tape measure, etc?



    Thanks for the help.

  2. #2
    Senior Member
    Join Date
    Apr 2008
    My Bikes
    Cervelo RS, Specialized Stumpjumper FSR Pro, Schwinn Typhoon, Nashbar touring, custom steel MTB
    Posts
    5,037
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by w98seeng View Post
    Also, the bend in the rear dropouts, how do I tell if the angle is correct? I presume the dropout has to be parallel to the centerline of the bike. I do not have any tools to measure this and I really can't afford to buy any. Are there methods to check alignment at home using string, a building square, a tape measure, etc?
    Here's what I do in situations like these: pull enough components out of the junk box to build the bike, throw some wheels on it, then ride it down the street. If it tracks relatively straight and feels fine, then it's good to go! Given that you don't have any money to spend on tools, or a professional alignment, what else can you do?

  3. #3
    Senior Member Nessism's Avatar
    Join Date
    Jun 2004
    Location
    Torrance, CA
    My Bikes
    Homebuilt steel
    Posts
    2,324
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'd fix it. Sheldon Brown's site details how. Pretty easy fix.
    Becareful buying/selling bike parts on-line. I learned the hard way. :(

    Good/Bad Trader Listing

Posting Permissions

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