Seperated Rim Seam?
12-08-22, 11:01 PM
#51
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Originally Posted by Miele Man
No it isn't. The crack/line I posted about does not go all the way down the rim like the rim joint does. It's clearly a different area and possible issue.
Note. It's from the opposite, so mirrored.
It would stretch credulity beyond yield for a near identical, perfectly straight to form in the same relative position.
Besides, if you look close enough, you can see the gap close halfway down, with the closed seam still visible.
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12-09-22, 06:05 AM
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Originally Posted by FBinNY
Take another look at the photo without tire in the OP. You'll see same split on both sides in the exact same place with respect to the spoke.
12-09-22, 07:53 AM
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Originally Posted by Soody
I did not. This is interesting to me. So... the seam is not welded, and the brake track and hook of the rim are just held in place by a pin below and tension? That seems crazy.
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12-09-22, 10:30 AM
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Originally Posted by dsbrantjr
When a tire is mounted and inflated, the joint is being pushed together, not pulled apart. Not crazy at all
12-09-22, 01:18 PM
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Originally Posted by FBinNY
Take another look at the photo without tire in the OP. You'll see same split on both sides in the exact same place with respect to the spoke.
Note. It's from the opposite, so mirrored.
It would stretch credulity beyond yield for a near identical, perfectly straight to form in the same relative position.
Besides, if you look close enough, you can see the gap close halfway down, with the closed seam still visible.
Note. It's from the opposite, so mirrored.
It would stretch credulity beyond yield for a near identical, perfectly straight to form in the same relative position.
Besides, if you look close enough, you can see the gap close halfway down, with the closed seam still visible.
Cheers
12-09-22, 01:21 PM
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Originally Posted by dsbrantjr
When a tire is mounted and inflated, the joint is being pushed together, not pulled apart. Not crazy at all
Cheers
12-09-22, 03:03 PM
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Originally Posted by Miele Man
With my split rim the wheel was rideable until I deflated the tire and then the wheel tacoed badly and t he split in the rim got a lot bigger. With the inflated tire on the rim the split was barely noticeable.
Cheers
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12-09-22, 03:09 PM
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Originally Posted by dsbrantjr
When a tire is mounted and inflated, the joint is being pushed together, not pulled apart. Not crazy at all
12-09-22, 03:15 PM
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Originally Posted by Soody
Well sort of. I wanted to use these wheels on a different, nicer build, with some new consumables, because they have good hubs. But with this flaw, even purely a cosmetic one, I will put them onto something much cheaper, aim for ~$50
If you're curious about my work/local market these are the bikes i'm currently selling:
https://www.trademe.co.nz/a/search?m...isting=6820063
A New Zealand dollar is about 60 US cents.
If you're curious about my work/local market these are the bikes i'm currently selling:
https://www.trademe.co.nz/a/search?m...isting=6820063
A New Zealand dollar is about 60 US cents.
Let me just add that this wheel flaw is really more than cosmetic. Cosmetic or not, if you plan to sell any bike with those wheels, it would be unconscionable of you to not disclose that flaw, or any other flaw for that matter in a listing.
12-09-22, 03:20 PM
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Originally Posted by JohnDThompson
BITD, welded rims were the exception rather than the rule..
Rims from the 70's- welded.
Rims from the 80's welded.
Pinning without welding was a way to make rims cheaper, they knew what was better.
I have 10 random wheels here, 7 of 10 are welded.
12-09-22, 04:25 PM
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Originally Posted by Schweinhund
Not quite. It's still going to flex like all rims do. Taut spokes lessen that some but not completely. Fact remains that the pins are clearly bent.
12-09-22, 04:47 PM
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Originally Posted by Trakhak
FBinNY pointed out in post 6 that the problem is not bent pins but rather that the ends of that rim extrusion were cut square and therefore could not be made to meet perfectly from the top to the bottom of the rim when it was formed into a hoop. The rim would look the way it does whether or not the pins were bent.
Yes. Bent pins.
12-09-22, 06:36 PM
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What I believe happened, is an unplanned stoppie. If it wouldn't have had a tire bead holding it together it would have been catastrophic.
So dude is riding along and a unplanned emergency runs in front of him and he grabs a handful of brake, the front one.
Stoppie. Dude is still on the seat as the bike comes crashing down on the back wheel. For a strong highly tensioned wheel, probably not a problem. This wheel ain't that.
So the seam is at a 90° to the point of impact, and dude is not a little guy and his rear is driving the bike down. wheel distorts just enough to bend the pins.
Front rim would just require running into something firmly with the seam at a 90° to the impact.
So dude is riding along and a unplanned emergency runs in front of him and he grabs a handful of brake, the front one.
Stoppie. Dude is still on the seat as the bike comes crashing down on the back wheel. For a strong highly tensioned wheel, probably not a problem. This wheel ain't that.
So the seam is at a 90° to the point of impact, and dude is not a little guy and his rear is driving the bike down. wheel distorts just enough to bend the pins.
Front rim would just require running into something firmly with the seam at a 90° to the impact.
12-09-22, 07:43 PM
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Originally Posted by FBinNY
FWIW - the problem is that the extrusion was cut square, so there was a bit of a missing pie wedge when it was formed into a circle.
Originally Posted by Schweinhund
What I believe happened, is an unplanned stoppie. If it wouldn't have had a tire bead holding it together it would have been catastrophic.
So dude is riding along and a unplanned emergency runs in front of him and he grabs a handful of brake, the front one.
Stoppie. Dude is still on the seat as the bike comes crashing down on the back wheel.
So the seam is at a 90° to the point of impact, and dude is not a little guy and his rear is driving the bike down. wheel distorts just enough to bend the pins.
So dude is riding along and a unplanned emergency runs in front of him and he grabs a handful of brake, the front one.
Stoppie. Dude is still on the seat as the bike comes crashing down on the back wheel.
So the seam is at a 90° to the point of impact, and dude is not a little guy and his rear is driving the bike down. wheel distorts just enough to bend the pins.
A simple, plausible manufacturing event vs emergency "stoppie" resulting in wheel striking pavement, seam coincidentally at 90° to pavement, with a rider of a certain mass who doesn't know how to brake.
12-09-22, 08:43 PM
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Originally Posted by sweeks
I invoke Occam's Razor.
A simple, plausible manufacturing event vs emergency "stoppie" resulting in wheel striking pavement, seam coincidentally at 90° to pavement, with a rider of a certain mass who doesn't know how to brake.
A simple, plausible manufacturing event vs emergency "stoppie" resulting in wheel striking pavement, seam coincidentally at 90° to pavement, with a rider of a certain mass who doesn't know how to brake.
Yes. A catastrophic event is more plausible than a one in a million manufacturing defect.
12-09-22, 09:34 PM
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I think this could be schrodingers wheel where I both cut the spokes and scrap it, and ride happily on it for years more
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12-09-22, 10:07 PM
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Sometimes a thread reaches a point where people have very solid unshakable positions. Rather than argue or try to prove anyone wrong I invoke the spirit if Justice Brandeis who might have said, "the remedy for bad information is more information."
We've beat this horse enough and people can sort through the posts and decide for themselves what to believe.
We've beat this horse enough and people can sort through the posts and decide for themselves what to believe.
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12-09-22, 10:12 PM
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Originally Posted by FBinNY
Sometimes a thread reaches a point where people have very solid unshakable positions. Rather than argue or try to prove anyone wrong I invoke the spirit if Justice Brandeis who might have said, "the remedy for bad information is more information."
We've beat this horse enough and people can sort through the posts and decide for themselves what to believe.
We've beat this horse enough and people can sort through the posts and decide for themselves what to believe.
12-10-22, 09:32 AM
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Originally Posted by cyccommute
Not an obvious marker of a low end rim at all. Even welded rims are pinned. I’ve broken down many rims for scrapping and they all have pins. It’s how the rim is held together so that it can be welded.
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12-16-22, 06:35 PM
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Originally Posted by veganbikes
Time for a new rim or a new wheel entirely. I wouldn't ride on that personally.
=8-(
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
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12-16-22, 06:36 PM
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Originally Posted by Soody
I did not. This is interesting to me. So... the seam is not welded, and the brake track and hook of the rim are just held in place by a pin below and tension? That seems crazy.
=8-(
__________________
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
12-16-22, 06:37 PM
#72
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Originally Posted by Soody
What do you guys reckon about this? 
=8-(
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
12-16-22, 06:54 PM
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Originally Posted by mrrabbit
Wasn't aware this was the Chicken Little forum...
=8-(
=8-(
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“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
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