Broken spokes - wheel/hub/what?
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Broken spokes - wheel/hub/what?
I've had my bike for almost 10 years. A little over a year ago, I started breaking spokes on my rear wheel every once in a while. I decided to have the wheel replaced by my LBS. A month ago, I broke a spoke on that wheel. It broke off right at the hub. I had it replaced and broke another one a week later, again, right at the hub. I had that fixed and broke another a few days later, you guessed it, at the hub. On the bright side, I now know how to replace a drive side spoke on my rear wheel. I had a knowledgeable friend look at my wheel and he says it's a quality wheel. I haven't gained a bunch of weight -- in fact I've lost some.
My questions: Should I just rebuild or replace the wheel being that it's likely spokes will keep breaking? Could it be some issue with the hub because that's where they keep breaking? What is the useful life of a wheel? My bike is a Trek 720 hybrid -- nothing special, but I ride it a lot and it's been dependable.
My questions: Should I just rebuild or replace the wheel being that it's likely spokes will keep breaking? Could it be some issue with the hub because that's where they keep breaking? What is the useful life of a wheel? My bike is a Trek 720 hybrid -- nothing special, but I ride it a lot and it's been dependable.
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Sounds like a case of low-quality spokes, probably compounded by low-quality wheelbuilding (by a robot). If it were me, I'd have a brand-new wheel built by hand by a good wheelbuilder, using DT or Wheelsmith spokes.
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Usually when spokes break at the hub it's a sign of insufficient spoke tension. Loose spokes flex more and the continuous flexing fatigues the metal in the "J" bend at the hub. But this happens more often on the non-driveside where tension is lower due to asymetrical wheel dish.
In your case mechBgon may be exactly right, poor quality spokes.
Al
In your case mechBgon may be exactly right, poor quality spokes.
Al
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Originally Posted by Al1943
Usually when spokes break at the hub it's a sign of insufficient spoke tension. Loose spokes flex more and the continuous flexing fatigues the metal in the "J" bend at the hub. But this happens more often on the non-driveside where tension is lower due to asymetrical wheel dish.
In your case mechBgon may be exactly right, poor quality spokes.
Al
In your case mechBgon may be exactly right, poor quality spokes.
Al
It's time. New spokes, probably a new rim and maybe time to splurge on those Phils you've been lusting for You know you want them. Doncha? Huh? Nice and shiny.
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Originally Posted by cyccommute
I agree for the most part but would add that this is a 10 year old wheel.
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Originally Posted by jimmuter
Actually, the bike is 10 years old. The wheel in question is just over 1 year old. The wheel I replaced last year lasted 9 years.
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Originally Posted by jimmuter
Actually, the bike is 10 years old. The wheel in question is just over 1 year old. The wheel I replaced last year lasted 9 years.
Hub problems are hub problems, spoke problems are spoke problems, rim problems are rim problems. If your hub were shot for example, spokes could still be ok.
Good luck.
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Maybe the spoke holes in your hub are a bit oversized, which would compound the problem of having low-tensioned spokes. Perhaps rebuilding the wheel, or just the drive-side, with quality spokes and spoke washers at the hub would solve your problems.
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Take the wheel to the shop and have them put a tensiometer on the spokes. The tension is probably too low - if the tension is OK (105 kg or more) you should get better spokes. Maybe butted 2.0/1.8/2.0 mm - the thinner middle section allows them to stretch more under shock loading.