Advertise on Bikeforums.net



User Tag List

Results 1 to 3 of 3
  1. #1
    Lover of Old Chrome Moly Myosmith's Avatar
    Join Date
    May 2011
    Location
    NW Minnesota
    Posts
    2,544
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Chrome Moly vs. HiTen fork

    I wasn't sure where to post this but it seemed to be more of a frame builder question than a mechnic question so I thought I'd try it here first.

    I've got a 1990 Trek 700 frameset with the chrome-moly main tubes and the hi-ten fork. The 730 of that year came with a chrome-moly fork. I can get a chrome-moly fork that is a nearly exact replacement for the original but I'm wondering just how much of a difference in weight, comfort and strength it would make to replace the hi-ten with chro-mo. The reason I ask is that the original fork received some cosmetic damage last summer and I'm looking at repainting it (too much damage for a decent touch up, but LBS says fork is structurally fine). I can upgrade to chro-mo for about $60 but I'm wondering if it is worth it.

    Thanks
    Lead, follow or get out of the way

  2. #2
    Decrepit Member Scooper's Avatar
    Join Date
    Aug 2005
    Location
    San Francisco California
    My Bikes
    2007 Waterford 953 RS-22
    Posts
    8,640
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi-ten has a lower yield strength than chromoly, so for the hi-ten fork blades to resist permanent bending in a collision for example, the wall thickness for blades of similar outside dimensions would have to be thicker (and therefore heavier) for a hi-ten fork than for a chromoly fork. Also, because the hi-ten blades have thicker walls, the fork won't have the flexibility and resilience of a chromoly fork.

    IMHO, for $60 it would be a worthwhile upgrade.
    - Stan

  3. #3
    Senior Member
    Join Date
    Jul 2011
    Posts
    1,447
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The variation in tube thickness tends to be that the tube needs to be twice as thick in order to be the same strength, but that does not mean the whole thing will weigh twice as much, due to the weight of other common components and whether design wise strength is the governing design factor, and depending on how much of the upgrade fork is upgraded to chromo at a lower weight.

Posting Permissions

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