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??? -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/8oXOcdAq-SUJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
