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Stress cracks in rim

Old 01-25-11, 09:59 AM
  #26  
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BTW, Monsieur Slowleak, Peugeot photographies...s'il vous plait.

Pix...we dig 'em, baby!

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Old 01-25-11, 11:18 AM
  #27  
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Originally Posted by T-Mar View Post
Most people do not ride their bicycles enough to allow the rims to get to this point. I've only seen this a handful of times and generally there was a big, deep circumferential score from something embedded in the brake pad. However, I have seen several ATB rims which were getting dangerously close, having a pronounced concave sidewall, which is not suprising given the conditions they're ridden in. Commuting would be better, though not much if you're an all-weather commuter. No doubt, disc brakes are the solution for this sort of problem but lacking that, periodic inspection and picking foreign material out of pads will help delay the process.

BTW, great pic for your avatar. Given you location, I assume that was taken on the Charles? We were down there this past October, watching my son's crew win their event at the Head race.
We are a one car family and my wife works outside the city, so my bike is my (and my two kids in the trailer) primary mode of transport.

Congrats to your son! Now I only race a few times a year and the Head is one I never miss. The picture was taken in 1997 during a practice session at the World Championships in Lac d'Aiguebelette, France. My last year on the National Team....
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Old 01-25-11, 12:21 PM
  #28  
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Originally Posted by cycleheimer View Post
Grab a set of wheels from a cheap and/or junked "donor bike", or buy a set of new rims and rebuild the wheels as a winter hobby project. If you haven't built up a set of wheels, you can get how-to information online and be on your way to developing a great new skill that can come in handy.

27" rims .... https://www.niagaracycle.com/index.php?cPath=123_379
700c rims .... https://www.niagaracycle.com/index.php?cPath=123_380

Check out the prices these guys have for tires, cables and everything else. Many are unbeatable!
I took a look there but I didn't see much in 36 spoke that looked anything like what I have. Everything is either super deep, extra wide, or aero style. A few there looked possible but I didn't see any width or specs listed.
Any suggestion? The ideal rim I guess would be something that looks like a Rigida 1320 or Araya 20A, with some grommets in the spoke holes so this don't happen again.
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Old 01-25-11, 12:30 PM
  #29  
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I had a set of rims years ago, not sure what brand they were but they were low end and well used. Someone gave me a new set of extra high pressure tires rated at 110psi, vs the 90 or so psi that I was running.
Liking how well higher pressure tires rolled I mounted them up and inflated to 110 psi. I was walking away from the bike to put the pump back in the garage when the rear tire exploded. The tire blew off the rim, but it didn't jump over the bead, the rim blew out the side, it looked a lot like the rim pictured above. The rim had flattened out and split along about an 8" section, when it did so it let go of several spokes and the resulting warp locked the wheel against the seat stays. It had lost about 6 right side spokes, or at least lost tension on that many on all on once side in the same spot so the rim just folded over not having the support of that one edge.

The tire was fine, the tube was in two pieces with on end hanging out the side. It sounded like a shot gun blast. While I was looking at the rear damage, the front tire blew out as well, spreading out the one side of the rim but not as bad. The tires were high end 1" skinwalls.
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Old 01-25-11, 02:01 PM
  #30  
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Originally Posted by slowleak View Post
I took a look there but I didn't see much in 36 spoke that looked anything like what I have. Everything is either super deep, extra wide, or aero style. A few there looked possible but I didn't see any width or specs listed.
Any suggestion? The ideal rim I guess would be something that looks like a Rigida 1320 or Araya 20A, with some grommets in the spoke holes so this don't happen again.
The Alex x404 caught my eye. I like the center ridge, which reminds me of the old Araya and Ukai rims. Jenson also has the for $12.95 each .... https://www.jensonusa.com/store/produ...+X404+Rim.aspx
Yea, I know. It doesn't look French.

Last edited by cycleheimer; 01-25-11 at 05:28 PM.
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Old 01-25-11, 07:09 PM
  #31  
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Originally Posted by slowleak View Post
Liking how well higher pressure tires rolled I mounted them up and inflated to 110 psi. I was walking away from the bike to put the pump back in the garage when the rear tire exploded.
I have grown to dread hearing the creak... creak... creak... sound, followed by a flash of recognition, a frantic dash and dive toward an about to explode, recently inflated tube seeking its freedom, in a doomed attempt to reach the inflation valve and relieve the pressure before the inevitable explosion...

Fortunately, the occurences have tapered off lately, now that I'm refraining from pairing low price tires with non-hooked rims and inflating them to the max pressure indicated on the sidewall...
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Old 01-26-11, 01:33 AM
  #32  
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Originally Posted by cycleheimer View Post
The Alex x404 caught my eye. I like the center ridge, which reminds me of the old Araya and Ukai rims. Jenson also has the for $12.95 each .... https://www.jensonusa.com/store/produ...+X404+Rim.aspx
Yea, I know. It doesn't look French.
The X404 is wide compared to what I have, these are more like Rigida 1320s not the Araya 18 or w/o as sometimes referred to. They are also 27" only, I need 700C.

Anyhow, today, the dumpster again seems to have provided. I picked up a badly trashed, rusted, purple steel clunker, with two minty clean 700C Weinmann rims laced to 'Quando' quick release hubs. The bike has all Altenburger brakes, and steel everything else. It looks like someone made a bad attempt at removing the cottered steel cranks without removing the cotters first. I pulled the wheels, rear derailleur, (Suntour 7), and the apparently new Z chain, brakes, and bars and left the rusty carcass for the scrap guys. It was just too nasty to put in the new car.
The forks and frame were all super low end, bright purple, foil decals, stamped dropouts, and steel everything. I also saved the super sized 'Cloud 9' super sized saddle.

The rims are in great shape, and look almost just like those with the cracks. They are filthy dirty but a good wash will fix that. The tires are minty looking Specialized Tri Sport 700x25C, with thorn resistant tubes. All I need to do now is loose the odd ball hubs in favor of something proper.
I'm not sure what model the Weinmann rims are, but they appear to be nearly identical to Rigida 1320s but are more brushed or polished finish. The rear rim has some brake wear but nothing serious, I think it will polish right out. They are spaced 126mm and have a Suntour 6 speed freewheel.
In the same dumpster was another wheelset, a set of unknown 27" rims with the same tires, and steel nutted hubs. The rims are decent, perfectly true but they have stains all over from what ever was spilled on them. Sort of like acid rain type marks on the dull aluminum surface. They appear to have been respoked with stainless spokes recently as the spokes are new and shiny looking.
I tired the 27" rims and they could work too, but are a tighter fit and I'd have to move the pads all the way up to get rim contact. The 27" rims are a bit wider, and are 5 angle type rims, where as an Araya would be a simple box, these have a narrow corner flat where the sides meet the spoke bed surface. The hubs were Shimano 3.3.3.
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Old 01-26-11, 08:48 AM
  #33  
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Originally Posted by Rocket-Sauce View Post
We are a one car family and my wife works outside the city, so my bike is my (and my two kids in the trailer) primary mode of transport.

Congrats to your son! Now I only race a few times a year and the Head is one I never miss. The picture was taken in 1997 during a practice session at the World Championships in Lac d'Aiguebelette, France. My last year on the National Team....
Thxs. I'll relay the message to him. Looks like we have lots in common. The wife is the driver in out family too. I walk or bicycle commute and used to tote my son around in a trialer. My son was on the Canadian National Junior Team (8+) last year and competed at the World's in Racine, Czech Republic. If he does well at the Indoor Nationals next weekend he's eligible for the World's in Boston, so there's a possibility that we may be back down your way in a few weeks.
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Old 01-26-11, 06:04 PM
  #34  
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Originally Posted by old's'cool View Post
I have grown to dread hearing the creak... creak... creak... sound, followed by a flash of recognition, a frantic dash and dive toward an about to explode, recently inflated tube seeking its freedom, in a doomed attempt to reach the inflation valve and relieve the pressure before the inevitable explosion...

Fortunately, the occurences have tapered off lately, now that I'm refraining from pairing low price tires with non-hooked rims and inflating them to the max pressure indicated on the sidewall...
It's one thing when the tire slips and lets the tube out, but another when the rim can't handle the pressure and ruptures. It used to be fairly common to see high pressure tires put on low end rims, even steel rims for that matter, which blew out the side of the rim not just the tube. One that comes to mind was a guy that put 110psi Continental tires on an old set of department store steel rims. The side of the rim just flattened right out.
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Old 01-26-11, 10:07 PM
  #35  
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Originally Posted by nlerner View Post
Oh crap, I just got it. That is totally hilarious!
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Old 01-27-11, 07:38 AM
  #36  
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Originally Posted by slowleak View Post
I had a set of rims years ago, not sure what brand they were but they were low end and well used. Someone gave me a new set of extra high pressure tires rated at 110psi, vs the 90 or so psi that I was running.
Liking how well higher pressure tires rolled I mounted them up and inflated to 110 psi. I was walking away from the bike to put the pump back in the garage when the rear tire exploded. The tire blew off the rim, but it didn't jump over the bead, the rim blew out the side, it looked a lot like the rim pictured above. The rim had flattened out and split along about an 8" section, when it did so it let go of several spokes and the resulting warp locked the wheel against the seat stays. It had lost about 6 right side spokes, or at least lost tension on that many on all on once side in the same spot so the rim just folded over not having the support of that one edge.

The tire was fine, the tube was in two pieces with on end hanging out the side. It sounded like a shot gun blast. While I was looking at the rear damage, the front tire blew out as well, spreading out the one side of the rim but not as bad. The tires were high end 1" skinwalls.
I thought the general rule on straight sided steel rims was 80PSI as an absolute max, doesn't matter if the tire is rated 80,000,000PSI, something to do with the weakest link.....
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Old 01-30-11, 11:07 PM
  #37  
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Originally Posted by Wogsterca View Post
I thought the general rule on straight sided steel rims was 80PSI as an absolute max, doesn't matter if the tire is rated 80,000,000PSI, something to do with the weakest link.....
Maybe so, but they never put that on the rim anywhere back then, I had never heard of blowing up the rim not the tire.
Just about any road bike tire you buy now is rated at 90psi or more. I'd even be concerned about some single wall aluminum rims at higher pressures. I do have 110psi skin walls on a set of Araya 18 rims though with no problems so far running at 105psi, which is the max my pump will go.
If I don't go to the max pressure or if I run cheaper tires that take only 90 psi they look flat when I sit on the bike.
At 330lbs or so of my weight and what ever I have on the back rack I need as much pressure between the rim and the road as I can get. As I get older, I don't foresee getting any lighter, so I'm not sure what to do about tires if I can't go above 80psi on single wall rims. Right now, only one bike of mine has steel rims, a pair of Araya narrow steel rims that have a pair of 27 x 1 1/8" skin wall Cycle Pro tires on them marked at 100psi. I run those at 100 with no problems but their a super tight fit to install and I've got thick thorn resistant tubes in them.
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