OK Matt, that counts as weathering - in this case it's mechanically assisted weathering - and it has nothing whatsoever to do with the cracks they are discussing on this thread.
On Thursday, December 6, 2012 10:38:19 AM UTC-6, Matt Beebe wrote: > > If you ride in the grime and rain, a common reality if you commute by > bike, your brake pads will eventually eat through the rim sidewalls. > Even if you only ride in dry conditions, dirt will get in there, between > the pads and the rim, unless you are riding in a clean room. > > > > On Thursday, December 6, 2012 10:11:51 AM UTC-5, 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??? >> >> -- 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/-/Dhm8e0ILIrAJ. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
