Urgent help - breaking spokes

Discussion in 'Cycling Equipment' started by Guest, Nov 17, 2001.

  1. Guest

    Guest Guest

    Help - I am taking part in the 94,7 tomorrow. I have a Trek 7200 FX. The spokes on the rear wheel started breaking two weeks ago. Always the lefthand set and one at a time. I have had the standard spokes replaced with DT spokes a while ago when I had the same problem. Now it is starting all over again. Could it be my weight. I weigh 110 Kg. what solution. I think the rim is 24 spoke. Should I upgrade to a 32 spoke rim???? Please help. I will carry three spare spokes for tomorrows race.
     
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  2. Guest

    Guest Guest

    hmm that sounds nasty :(. all i know i from advice from the bloke from my bs. did you install you spokes? they should not be all the same tension some this is to allow for strech. if the spokes where not fited right they might of had too much tension and snaped?. and once one went the the others where weakend.? any whay thats my guess :) and going to a 32 spoke wheel is not a upgrade :) its a downgrade :)
     
  3. Guest

    Guest Guest

    Hi H. You don't say where the spokes are actually breaking.
    At the hub flange, or at the nipple?
    Inside spokes or outside? Or both?
    How many spoke crosses on each side?

    If at the flange, then there are a number of causes -

    1. Spoke elbow too long for the width of the flange.
              Solutions: Use small washers at the elbow
                            Find spokes with the correct elbow length
                            to suit your hub.
     DT did have a change, and some controversy.
     Here's the link:
     http:/www.peterwhitecycles.comDTspokes.htm

    2. Spoke tension incorrect. If spokes are not tight enough,
       the wheel flexes (side to side) causing the spokes to flex
       i.e. bend back and forth a little where they exit the hub.
       Spokes are very strong in tension, but don't last long
       under such conditions.

    IMHO, the 32 spoke wheel is stronger. Plus you will have 16
    spokes pulling, not just 12.  

    If you were to hawk your wheel round to different bike shops,
    you may get any one of the following responses:-

     1. Just replace the broken spokes.
     2. A full rebuild, same as before.
     3. A full rebuild, using all new spokes, tight, no fancy lacing
         or crossings, and no radial. Cross 3 or 4 both sides.

    Number 3 option is the one you need.

    <Admin - fixed link>
     
  4. Guest

    Guest Guest

    willie obviosly knows all the tech wording :)

    but willy you said that 32 spoke wheels are stronger this is not what i have heard

    the bloke from the bs said:

    the amount of spokes (eg 32) was used before not only to suppord the hub but also support the rim.

    now with the new rims there they are much stronger and do not need the spoke support. the spokes only need to really support the hub. also because of the greator tension and desiging 16 spokes are no weaker than 32. ;D

    so what do you think?
     
  5. Guest

    Guest Guest

    Here are some links which may be of interest:

    http://sheldonbrown.com/wheelbuild.html
    http://simon.trinhall.com.ac.uk/bike/wheels.html
    http://www.youngwheels.com/index.html
    http://www.wheelsmith.com/page5.html
    http://www.peterwhitecycles.com/DTspokes.htm

    Later.
     
  6. Guest

    Guest Guest

    Please accept my apologies for the multiple posts.
    The computer was showing Error, etc., so I tried again....
    Sincerely,
    Willie.

    No problem - all fixed - Vo2 ;)
     
  7. Guest

    Guest Guest

    I had a similar problem on a bike I'd put together for commuting. Tried different types of spokes, lengths, tensions etc. Even tried using different wheels but to no avail. Was getting through one spoke per 40 miles. I can only assume there was something wrong with the frame or it's alignment. Solved it by dirching the bike.

    My sympathies are with you.
     
  8. captn willard

    captn willard New Member

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    First, the trek 7100 comes with stock with a 32 spoke wheel.

    The poster with all the recommendations is correct in all but mentioning that overtighten spokes will also cause breaks. So will uneven tightening around the set.

    His recommendation for a total rebuild with all new spokes (you should not reuse spokes once they have been tensed) is the mechnics recommendation but your cost effective option is going to be replacing the wheel entirely. Labor rates on a rebuild plus materials will cost you more than a new wheel. This is your opportunity upgrade to a better wheel.

    CapN W
     
  9. werzel

    werzel New Member

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    went through a phase of breaking spokes every 100km or so on my back wheel until i had it rebuilt with 14G stainless spokes. only had to true it yesterday for the first time after 7000km and have not broken any spokes
     
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