Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Senior Member surreal's Avatar
    Join Date
    Mar 2002
    Location
    NJ
    Posts
    2,868
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)

    what am i missing? ebay question

    ok, whenever i'm browsing ebay, ppl list bikes or frames with lines like "some scratches, but the bike has never been crashed."

    i don't know bout y'all, but i tank on my bike fairly frequently, and it never results in any serious damage to the frame, although my bars are a bit bent now on the one side. things get scratched, but not dented.

    is a crashed bike really a problem, assuming there's no big dents in the tube? i'm not thinking of buying any such frames, i'm merely curious.

    -rob

  2. #2
    (Grouchy)
    Join Date
    Mar 2003
    Posts
    3,643
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    a crash can cause really nasty stresses on the tubes...but usually, if there's no huge dents, or the downtube hasn't collapsed in on itself, it's reasonably safe...there might be some minor allignment problems with it...but that's nothing the old F.A.G. and D.A.G. tools can't fix.

  3. #3
    Senior Member p3ntuprage's Avatar
    Join Date
    Dec 2003
    Location
    birmingham
    My Bikes
    a tvt soon to become a s/s...
    Posts
    829
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    it can be a problem because the crash might exceed the material's fatigue limit type thing [i'm a mechanical engineer i should probably know the correct term but can't thinkof it right now]

    basically if the stresses in a material stay below a certain level, it will never fatigue. but if the stress rise above that level, any stresses after that will contribute to weakening it.

    you can try this at home with a paperclip. keep bending it in the same place and it will eventually snap.

    aluminium has a really low fatigue level [which is exceeded in ordinary use half the time]
    steel has a quite high limit, but stresses could rise above it if it's crashed
    i'm not sure if titanium has a limit.

    fssb
    sparky
    http://www.anarchistblackcross.org/i...ls/blkred2.jpgwithout a worker's army, the workers have nothing.[img]

  4. #4
    Senior Member surreal's Avatar
    Join Date
    Mar 2002
    Location
    NJ
    Posts
    2,868
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    yeah,yeah, i hear ya. but we're talking about a mildly fat guy in some relatively low-speed crashes on a steel rig. there's no visible damage, no dents, no obvious problems where things are misaligned, etc. i could clearly sell the thing as having 'never been crashed', and no buyer would know. further, if i was looking to buy the frame, and the seller told me it had been crashed, it wouldnt even worry me at all.

    really, now, how long can one ride a bike daily (thru icy conditions, drunken conditions, with a hub failing/locking up, etc) without crashing his rig? it's just bound to happen eventually, and i cant imagine anything but a minority of crashes cause serious damage to the ol' frame.

    at least, that's my experience. heck, i've seen more damage done thru shipping a bike then thru crashing it. =P

    fs- vintage track frame, never been shipped... =P

    -rob

  5. #5
    Forum Admin lotek's Avatar
    Join Date
    Dec 2001
    Location
    n.w. superdrome
    My Bikes
    1 trek, serotta, rih, de Reus, Pogliaghi and finally a Zieleman! and got a DeRosa
    Posts
    17,606
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I thnk the term "never Crashed" really refers to
    Race type crashes, not the usual stuff that joe average
    cyclists would do.
    just my .02 worth

    Marty
    Last edited by lotek; 02-07-04 at 08:05 PM. Reason: market correction
    Sono pił lento di quel che sembra.
    Odio la gente, tutti.

    Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
    Want to upgrade your membership? Click Here.

  6. #6
    Rhymes With Bike Schiek's Avatar
    Join Date
    Oct 2003
    Location
    Washington DC
    Posts
    1,221
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by lotek
    I thnk the term "never Crashed" really refers to
    Race type crashes, not the usual stuff that joe average
    cyclists would do.
    just my .20 worth

    Marty
    Marty-

    Why is your advice ten times more valuable than the rest of ours?
    destructible.
    In The Crosshairs

  7. #7
    cxmagazine dot com pitboss's Avatar
    Join Date
    Jun 2003
    Location
    WI
    My Bikes
    Titus road, Fort CX
    Posts
    8,270
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Schiek
    Marty-

    Why is your advice ten times more valuable than the rest of ours?
    He is Moderator GOD (so he thinks)
    Deathlap - cyclocross, training, beer,...escape hatch

  8. #8
    Senior Member superchivo's Avatar
    Join Date
    Oct 2003
    Location
    Northern Virginia - just south of the normal people
    Posts
    313
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I always took "crashed" to mean "hit by car." IMHO if you're not crashing, you're not riding hard enough anyway. Of course I am biased.
    "I don't want to learn. The more you drive, the less intelligent you become."

  9. #9
    Senior Member
    Join Date
    May 2003
    Location
    Chicago, IL
    My Bikes
    Bianchi Pista, Miyata track, Schwinn Le Tour fixie
    Posts
    373
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you fall over the frame usually really doesn't even touch anything. (Bars, pedals, and rear axle absorb most of the fall.) I think you would have to really hit something solid to cause the frame to be damaged. A friend of mine ran straight into a lightpole with my steel Miyata track bike and I am pretty sure it is still good, haven't actually ridden it since though. The "never been crashed" is probably something that people just include to make you more inclined to bid and less worried about the condition of the bike..

    -Jason

  10. #10
    Senior Member superchivo's Avatar
    Join Date
    Oct 2003
    Location
    Northern Virginia - just south of the normal people
    Posts
    313
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    When I was a kid, I had a bad habit of crashing into cars. You can always bend the steel forks back.
    "I don't want to learn. The more you drive, the less intelligent you become."

  11. #11
    Forum Admin lotek's Avatar
    Join Date
    Dec 2001
    Location
    n.w. superdrome
    My Bikes
    1 trek, serotta, rih, de Reus, Pogliaghi and finally a Zieleman! and got a DeRosa
    Posts
    17,606
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    to quote my buddy homer
    Quote Originally Posted by homer
    DOH
    Sono pił lento di quel che sembra.
    Odio la gente, tutti.

    Are you a registered member? Why not? click here to register. Its free, and only takes 27 seconds!
    Want to upgrade your membership? Click Here.

  12. #12
    Senior Member p3ntuprage's Avatar
    Join Date
    Dec 2003
    Location
    birmingham
    My Bikes
    a tvt soon to become a s/s...
    Posts
    829
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by superchivo
    When I was a kid, I had a bad habit of crashing into cars. You can always bend the steel forks back.
    if you crash hard enough all you need to do is turn the stem 180

    and the brake block carriers... don't forget them.

    fssb
    sparky
    http://www.anarchistblackcross.org/i...ls/blkred2.jpgwithout a worker's army, the workers have nothing.[img]

Posting Permissions

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