oops, didn't convert inches to feet - they have 200 million cycles on them On Thursday, December 6, 2012 9:11:51 AM UTC-6, Ron Mc wrote: > > I'm a metallurgist and licensed professional engineer. If you make > something monolithic, it doesn't have a life span. If it's not monolithic, > it fatigues at something below 10 million load cycles (if it exceeds 10 > million load cycles, it's assumed to be monolithic). On a rolling wheel, > cycles add up quickly. What is being called stress cracking is really > fatigue, and it generally means there is a soft spot or hard spot, or > mechanical divot the the point the crack starts. Rims can also deteriorate > by weathering and then eventually stress crack, which is corrosion-assisted > cracking. But if you do it right, there is no reason to have a life limit. > My Rigida rims have 18 million cycles on them. > > On Thursday, December 6, 2012 1:19:50 AM UTC-6, Tim wrote: >> >> Ok so I've had the Homer for 2 years and am about to get my third rear >> wheel. Here's my story: Peter White built the bike and wheels. Velocity >> Synergy with XT hubs and 36 spokes.I hit a pothole pretty good fairly early >> in the bikes life. LBS said rim couldn't be tried so they built up another >> Synergy with my hub. Fast forward to now. That wheel has maybe 5-7k miles >> on it and has stress cracks all over it. They started around the spokes and >> spread to the sides. So time for another. I'm working in CT now and found a >> LBS that knows what a Riv is. Owner builds the wheels. Well, he says that >> Synergy rims (and Velocity in general) are just not that good. I've heard >> the same thing out of a couple of other people too, and they k ow more >> about wheels than me. Thing is, I can't imagine why Riv and Peter would so >> highly recommend them if they're poor quality. But my experiences are >> making me wonder, what with 2 wheels in around 10k miles. LBS guy is >> recommending a Mavic, I think one of the CXP styles saying they're much >> stronger. What should I do??? > >
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