I was just responding to this comment, by you: "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."
Matt On Thursday, December 6, 2012 12:38:23 PM UTC-5, Ron Mc wrote: > > 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/-/Eo1U5rp6IcwJ. 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.
