Advertise on Bikeforums.net



User Tag List

Results 1 to 3 of 3
  1. #1
    Newbie
    Join Date
    Nov 2014
    Posts
    1
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Can 9mm dropouts be enlarged to 10mm?

    Safely that is. I have an old JC Higgins 3 speed that I want to convert to a front hub electric wheel. The wheel has 10mm axles and the dropouts on the bike are nominally 9mm. Can they be enlarged using a file and still be strong enough to do the job?

  2. #2
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    3,134
    Mentioned
    45 Post(s)
    Tagged
    0 Thread(s)
    Sight unseen I'll say No .. Think about replacing the dropouts with something thicker and wider .. as torque thru the dropout is what moves you forward.

  3. #3
    Senior Member chas58's Avatar
    Join Date
    Jul 2010
    Posts
    1,071
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    1mm is nothing if it is a steel fork. If it isn't a steel fork, walk away. For front hub motors, stay with moderate power and speed, and use torque arms. If the fork breaks, you are going to hit the ground rather quickly.

Posting Permissions

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