Cycling Equipment · Public discussion

Aluminium/Scandium frame fatigue life

Started by Rik O'Shea · · Last activity · 6 posts · 1,514 views

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Cycling Equipment
Published
2 September 2003
Last activity
3 September 2003
Original author
Rik O'Shea
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  1. I was considering buying a good quality Aluminium frame and came across the following blurb:

    "These frames do not have the long fatigue life of steel but offer superior stiffness at reduced
    weight. For the serious racer or weight fanatic, the Scandium frames candle might not burn for as
    long, but it certainly burns the brightest!"

    So what happens to an Aluminium frame in terms of fatigue life - will it suddenly collapse when your
    out riding it after some determined amount of time ?

    Thanks & regards R

  2. Peter Chisolm said:

    And before somebody throws stones, there are some well made, long lasting aluminum framesets out
    there..But some in the 1 kilo range are not made to last for very long.

    The same goes for 1 kilo frames made from other materials. Stupid light cuts across all
    material types.
    --
    terry morse Palo Alto, CA terrymorse.combike

  3. Suzy Jackson said:

    ... I've got an old steel roadie in the garage with those much sought after horizontal dropouts,
    and a rear triangle that was brazed together when five speed freewheels were plentiful, that's
    been quietly gathering dust since I built my go faster aluminium massively overgeared clicky
    lever bike.

    So I thought about it a bit, and figured it'd be lots of fun to put track cranks and wheels on it,
    and throw away that nasty back brake for ever, and see if I can break myself of this terrible
    coasting habit. Further down the track (pun entirely intended) I could go and talk to a
    framebuilder and get a real track frame (or perhaps even a box of tubes and lugs), put my shiny
    new cranks and wheels on it, and see how much I can scare myself going around in circles (but
    always pedalling of


    course).

    The bike already has darn near everything you need on it. If I were you I would start with that. Use
    the place where the inner ring goes and the chainline will usually be pretty good. My advice would
    be to get a rear track hub so you have a lockring, a cog and a chain, and take off all the stuff
    that you no longer need. Done.

    When you get the real track bike, then is the time to worry about track cranks and other bits.

    Quoted message said:

    In any case, I cast around on the net looking for suitable candidates, and decided Record is
    ridiculously expensive, as is Dura-Ace.

    There's a surprise

    Quoted message said:

    Next down the list seems to be the Miche Primato bits, which seem at first glance to strike a good
    compromise between shinyness and expense. Are they as nice as they look?

    I haven't seen any up close and personal, so no specific comments. IIRC a friend uses their hubs and
    likes them.

    Quoted message said:

    I see they use cartridge bearings. What do I do when said bearings disintegrate?

    Buy a new one, This is, to me, a disadvantage. Of course, cartridge bottom brackets have shown their
    reliability, so maybe these hubs will last well, too.

    Quoted message said:

    The next issue is that the cranks are 135mm PCD, whereas most other track cranks seem to be 144.
    Is this likely to cause grief?

    135? Finding new rings will be a RPITA, probably. But if you use 1/8" it may be a long while before
    you need to worry about a new ring.

    Quoted message said:


    Finally, is it an issue squeezing the back end of a 126mm wide bike down to 120mm? It's had 130mm
    wide wheels forced into it before without significant complaint.

    It might be easier to add a couple mm of spacer to either side of the hub. Not likely to
    cause trouble.

    --

    David L. Johnson

    __o | Some people used to claim that, if enough monkeys sat in front _`\(,_ | of enough
    typewriters and typed long enough, eventually one of (_)/ (_) | them would reproduce the
    collected works of Shakespeare. The internet has proven this not to be the case.

  4. this is a good article.

    sheldonbrown.comframe fatigue test.htm

    jb

  5. Quoted message said:
    Quoted message said:

    And before somebody throws stones, there are some well made, long lasting aluminum framesets out
    there..But some in the 1 kilo range are not made to last for very long.

    Quoted message said:

    The same goes for 1 kilo frames made from other materials. Stupid light cuts across all
    material types.

    As a generalization that you can make a frame too light, regardless of material, that statement is
    true. But as a statement that implies all 1 kilo frames, regardless of material, are likely to fail
    under normal use... that is not true. We do not yet know the lower weight limit to what you can
    safely build a carbon frame, but there is certainly a very large body of evidence that ~1 kilo
    carbon frames can last a very long time.

    --Mike-- Chain Reaction Bicycles chainreactionbicycles.comchainreactionbicycles.com

  6. [email hidden] (Rik O'Shea) wrote in message
    news:<[email hidden]>...

    Quoted message said:

    I was considering buying a good quality Aluminium frame and came across the following blurb:

    "These frames do not have the long fatigue life of steel but offer superior stiffness at reduced
    weight. For the serious racer or weight fanatic, the Scandium frames candle might not burn for as
    long, but it certainly burns the brightest!"

    So what happens to an Aluminium frame in terms of fatigue life - will it suddenly collapse when
    your out riding it after some determined amount of time ?

    Thanks & regards R

    I've owned my Fuji Team Issue built by Teschner frames in Australia for almost 2 years, and it has
    over 4000 "fair weather" miles on it (my 23 year old Trek with Reynolds 531 has the rest).

    No problems so far... I love the Fuji, it just does everything very well.

    But, I am probably not the strongest rider in the world and weigh 145lbs max. I think I'd be more
    concerned if I weighed a lot more. I wouldn't let a 200lb rider ride it... Just some info for the
    record, and I'll post here if or when it breaks ...

    Good Luck, Nick

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