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???
>
>
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