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#1
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Broken spokes...again
A couple of weeks ago, my LBS replaced a broken spoke on my rear
wheel. After three rides, the wheel was way out of true. After I had the wheel retrued, I broke two spokes on my next ride. A friend suggested that the problem is the mix of new spokes and seven-year-old spokes in the wheel. Does the wheel need to be respoked or is the LBS just doing a bad job of trueing the wheel? The wheel is on my MTB (used for pavement only). The spokes are stainless steel, 14 gauge. The wheel has about 4700 miles of use over seven years. I weight about 155 pounds. Thanks |
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#2
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You need a new rim. By the time you have the wheel rebuilt, a new wheel
may be the same price. AcctHitman wrote: A couple of weeks ago, my LBS replaced a broken spoke on my rear wheel. After three rides, the wheel was way out of true. After I had the wheel retrued, I broke two spokes on my next ride. A friend suggested that the problem is the mix of new spokes and seven-year-old spokes in the wheel. Does the wheel need to be respoked or is the LBS just doing a bad job of trueing the wheel? The wheel is on my MTB (used for pavement only). The spokes are stainless steel, 14 gauge. The wheel has about 4700 miles of use over seven years. I weight about 155 pounds. Thanks |
#3
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Sad but true. You need all new spokes, and it might be easier/cheaper to
replace the rim. And it's the rear wheel that gets stressed... -- M. Powell "Mike Schwab" wrote in message ... You need a new rim. By the time you have the wheel rebuilt, a new wheel ((SNIP)) |
#4
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"AcctHitman" wrote in message
om... A couple of weeks ago, my LBS replaced a broken spoke on my rear wheel. After three rides, the wheel was way out of true. After I had the wheel retrued, I broke two spokes on my next ride. A friend suggested that the problem is the mix of new spokes and seven-year-old spokes in the wheel. Does the wheel need to be respoked or is the LBS just doing a bad job of trueing the wheel? The wheel is on my MTB (used for pavement only). The spokes are stainless steel, 14 gauge. The wheel has about 4700 miles of use over seven years. I weight about 155 pounds. Sometimes spokes fail because they were nicked by the chain falling off the cassette/freewheel, that's why many bikes have a protective disk there. These failures often occur many miles after they were damaged. Other than that, the most common failure mode is simple metal fatigue. Spokes fatigue usually because they weren't "stress relieved" when the wheel was originally built (a one-time operation). If you're interested, the details of the theory are in the FAQ: http://draco.acs.uci.edu/rbfaq/FAQ/8c.1.html It's possible that your wheel & spokes could be salvaged by being stress-relieved and tensioned now, but it's possible that you will still get broken spokes down the road given the fatigue that has already occurred. Unfortunately, completely rebuilding that wheel with new spokes is probably an economic loser, especially since new MTB wheels are pretty cheap. Not too many bike shops know how to set up new wheels, so if you buy one from an unenlightened shop your spoke problems may not be over. If you're inclined, it makes a lot of sense to learn to stress-relieve, tension, and true a wheel yourself, it's not very difficult. |
#6
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"John Everett" wrote
Lessons learned: 1) Spokes don't break because they get cuts or notches in them. You were lucky, often spokes do break at notches. Perhaps "often" is too strong a word, I have had many that have lasted, but several that have let go -- many miles later. |
#7
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Actually, I had a rim that kept breaking spokes. Had them replace all
spokes and nipples. Still breaking spokes. New rim and no more broken spokes. Cause was the rim was warped, and when they trued it with the new spokes there were several at maximum temsion just to get the rim straight. M Powell wrote: Sad but true. You need all new spokes, and it might be easier/cheaper to replace the rim. And it's the rear wheel that gets stressed... -- M. Powell "Mike Schwab" wrote in message ... You need a new rim. By the time you have the wheel rebuilt, a new wheel ((SNIP)) |
#8
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On Wed, 13 Oct 2004 19:47:40 -0500, Mike Schwab wrote:
Actually, I had a rim that kept breaking spokes. Had them replace all spokes and nipples. Still breaking spokes. New rim and no more broken spokes. Cause was the rim was warped, and when they trued it with the new spokes there were several at maximum temsion just to get the rim straight. Keep in mind that this is something that should have been checked as they were replacing the spokes. I would not consider this a reasonable action by the shop. If the rim was that bad, it would have been obvious when they unlaced it. -- David L. Johnson __o | Do not worry about your difficulties in mathematics, I can _`\(,_ | assure you that mine are all greater. -- A. Einstein (_)/ (_) | |
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