Greg's point is well taken. The breakage of spokes on new rear wheels
can be due to poor construction, new spokes loosening up, or weight
extremes (such as carrying heavily laden panniers with groceries on or
touring gear). Judging from your description Derek, it may be just
loosening of new spokes which aren't being attended to. This problem
increases with wider gear blocks (i.e. 9 or 10 cogs on back versus 6 or
7 cogs). On new wheels you should always monitor and re-tighten any
loosening spokes and re-true frequently. I just rode a new bike home
from the store the other day, and the rear wheel was out of true by the
time I got home. It's got a 9-gear cog block, and the spokes on the
non-cog side tend to loosen up very easily because it's impossible to
tighten them very much without taking the rim out of dish.
Hope this is useful.
Greg Franks wrote:
>
> >>>>> "dbarlas" == dbarlas <[EMAIL PROTECTED]> writes:
> [snip]
> dbarlas> on which I had the rear wheel rebuilt late last year with
> dbarlas> 14g DT spokes. I have since put about 4000kms on the bike
> dbarlas> and it has now started breaking spokes again. I dont
> dbarlas> think I am particularly rough on the bike - I weigh anout
> dbarlas> 190 lbs and only ride on the road. I got the bike in the
> dbarlas> summer of 2000.
> [snip]
>
> dbarlas> spokes. Does that sound reasonable? If anyone has any
> dbarlas> other recommendations for wheels, or general wheel
> dbarlas> advice, I would love to hear them.
>
> You didn't say where the spokes were breaking.
>
> Believe it or not, thinner spokes (higher gauge) often result in
> stronger wheels. Make sure your existing wheel is rebuilt with
> "double-butted" spokes*, or that the new wheel comes with double
> butted spokes. I weigh more than you do, and the only spoke breakage
> that I've encountered was during a certain tandem ride years ago :-)
> (though the poor wheel was rather pretzeled prior to the breakage
> problems, so we sure knew why the wheel was failing :-).
>
> Try to find/buy a copy of "The Bicycle Wheel" by Jobst Brandt. It
> explains everything that you might every care to know about bicycle
> wheels and then some. You might try rebuilding your wheel yourself.
> ..greg
>
> ----
> * a technically incorrect term -- spokes aren't butted, they're swaged
> (sp?).
>
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--
Roger Guillemette
Website: http://www.bigfoot.com/~roger_guillemette
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