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1/10/2009 7:06:21 PM
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fish
Posts 4
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HI all,
Just broke my second spoke in prob 1000 kays on my fulcrum racing 5 wheels... whats the g.o. they are less than a year old and prob done 4500k.. very annoying... i weigh 85kg. maybe coincidental but there is a small dent in the side of the rim. i dont know how it happened and noticed it about 2 weeks after purchase of the bike.. should have looked harder when i bought cause there is no way i did it but too late now... the spokes have broken from the rim end next to each other and near the dent.... on the cluster side
i am after some opinions... fix it for another 50 and risk more breaks or get some new wheels..
many thanks
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1/10/2009 8:21:48 PM
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Michael Warner
Posts 122
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Hi fish,
It's not a light, flimsy wheel, so your weight is unlikely to be the problem.
Multiple spoke breakage is usually caused by uneven spoke tension around the wheel, with some taking too much strain and others going slack when you hit bumps and holes. Whatever impact caused the dent may have overstressed nearby spokes, or excess tension may have been needed around there to true the wheel after the last break.
You should take it to a good wheelbuilder, who can judge whether the rim is straight enough to make the spoke worth replacing, or whether it needs to be straightened and the wheel rebuilt. Given your weight, he may recommend tougher drive-side spokes and/or higher tension, too. It's unlikely to be ready for the bin unless the rim has cracks around the eyelets, anyway. I'll leave it to those who've had wheels built around town to recommend someone.
Cheers,
Michael
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1/10/2009 10:41:49 PM
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Cos
Posts 30
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Yeah, Michael has pretty much summed it up.
The small dent, are there impact scratches at the centre of the dent, or is it clean? I ask because I have seen shipping damaged rims with no apparent impact point/scratch. A scratched dent is usually road damage so you wont have an argument for a warranty exchange.
The broken spoke as Michael points out is definitely uneven tension. When truing, the wheel needs to be straighted without tension. Only after it's trued, tension is added. Even after that, the mechanic needs to test & release false tension(twist) "if there" on each spoken and re-tension them...correctly! It takes patience and experience,...yeah, skill.
Your wheel smacks of an unskilled person trying to straight it (probably due to the dent).
Take it to Peter at International and explain the situation.
It should be a simple matter of truing, and perhaps replacing two or three nearby spokes.
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