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Old 09-05-02, 05:24 AM   #1
vlad
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Damage to bicycle rim caused by the type of tire used

Have you heard of any instance that a bicycle tire damaged a rim?
Can you furnish specifics of the occason and describe the damage?

Since Nov 2001 I use the polyurethane/nylon microfoam tire that has no air tube. wwww.airfreetires.com Others who read my posts have asked at their local bicycle shop about airfree tires. They were told vaguely "they damage the rims".

In the nine months and 2000+ miles that I have ridden bicycles equipped with airfree tires I have not noted any damage to the rims.

Will my rims suddenly shatter? or perhaps crumble on a downhill whizzzzzz at 48mph to pitch me headlong into a cactus; or to die impaled on a highway reflector standard gurgling in agony for the amusement of fourteen tourists who stopped to photograph this once-in-a-lifetime visual treat?

????????

Last edited by vlad; 09-05-02 at 06:47 AM.
 
Old 09-05-02, 07:27 AM   #2
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sigh, here we go again.

Vlad, you have some very useful things to say, why
rehash the same tired airless tire debate?

Marty
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Old 09-05-02, 10:30 AM   #3
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My son says his rims have a label saying "Max pressure 100 psi" or something like that. I looked at my rims and saw nothing of the sort. Does anyone know if the pressure in the tire can blow a rim apart?

I can see that installing solid tires may cause damage to the rims.
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Old 09-05-02, 11:18 AM   #4
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I think the issue of rim damage comes into play when you hit a bad bump.
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Old 09-05-02, 11:24 AM   #5
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Humm, new information is not always a tired debate. I had two "wedgie" LBS's tell me they are not recommended (same old arguments) but a local 'Bent LBS recommends them, even the owner and main sales/mechanic run them on their Ti GRR and GRR. So I ordered one for the rear of my LWB (Hugh said he didn't have one he would recommend for my front right now), I just got it and will install it, so we will see. But I like hearing new information from someone who is actually using it currently.
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Old 09-05-02, 12:24 PM   #6
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Quote:
Originally posted by AndrewP
My son says his rims have a label saying "Max pressure 100 psi" or something like that. I looked at my rims and saw nothing of the sort. Does anyone know if the pressure in the tire can blow a rim apart?
The max pressure is really a max recommended pressure. If the pressure is too high, a couple things could happen:

1) the tire could blow off the rim.
2) the threads in the case of the tire could break.

Usually the tire will blow off before the rim will blow apart. The exception is very worn rims (worn from rim brakes). I have heard of instances when air pressure can blow a weakened rim apart.

BR
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Old 09-05-02, 12:29 PM   #7
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I used a Greentyre airless tire for a while. I frankly can't imagine how an airless tire can damage the rim. As long as it is the right size for the rim there is no reason why it would apply unusual stress.

Now, there is a technique for mounting the tire on the rim. I sat and watched the guy at the strore practically killing himself trying to get mine on. Then a regular customer and user happened by who said he had purchased a special tool that made it easier though still difficult. Between the two of them they eventually got the tire on, during which time I had some concerns about my rim. A few months later I had occasion to take the tire off the good wheel I had put it on and reinstall it on a less expensive wheel. Guess what? Following the the clear and simple picture instructions and using the simple tool, the tire came off and went on very easily. DUH! These other guys were trying to gorilla the thing on. Although it is definitely a tight fit, proper technique made it quite easy.

As for inflatable tires, if you go to Mavic's website they have recommended maximum inflations for their rims. Extreme overinflation can eventually damage a rim.
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Old 09-05-02, 12:35 PM   #8
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Quote:
Originally posted by vlad
In the nine months and 2000+ miles that I have ridden bicycles equipped with airfree tires I have not noted any damage to the rims.

Will my rims suddenly shatter? or perhaps crumble on a downhill whizzzzzz at 48mph to pitch me headlong into a cactus; or to die impaled on a highway reflector standard gurgling in agony for the amusement of fourteen tourists who stopped to photograph this once-in-a-lifetime visual treat?

????????
2000 miles is really not much time for anything to happen to a well built wheel, regardless of how it is treated. LBM is right that it is the large bumps that cause problems. Microfoam is a form of air inflation, but it impedes or prevents the distribution of air pressure throughout the tire. This means when the "airless" tire is compressed in one place, the air pressure in the foam is greater in that one place. If a pnumatic tire is compressed in one spot, the air pressure of the entire tire goes up, but not as much as the locallized air pressure in an airless tire.

What will happen then, is that the wheel is more likely to be damaged by a large bump (pothole, curb, etc.) with an airless tire, than with a pnumatic tire. Most people use pnumatic tires because inflating tires every day and fixing flats a couple times every 1000 miles is worth it to (partially) avoid repairing or replacing wheels due to accidental bumps.

So, no the rim will not shatter or suddenly fail in normal operation with an airless tire, but in abnormal conditions the wheel with the airless tire will fail before a pnumatically equiped wheel.

Hope this helps.

BR
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Last edited by Brian Ratliff; 09-05-02 at 12:40 PM.
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Old 09-05-02, 12:48 PM   #9
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Good point, Brian. I hadn't looked at it that way. It is a pretty harsh ride. Now that you mention it, the reason I stopped using the Greentyre was because the ride quality was contradictory - so squishy it had perceivably greater rolling resistance while being uncomfortably harsh.

I commute 22 miles round trip every day on very trashy city streets using inexpensive 25 mm tires over Performance thorn resistant tubes and Mr. Tuffy liners. On the very rare occasions I have a flat it is due to something like a piece of metal whipping up and cutting through the sidewall. I have to replace the tires after about 1000 miles due to cuts from street debris, but I don't get many flats.
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Last edited by RainmanP; 09-05-02 at 12:51 PM.
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Old 09-05-02, 06:56 PM   #10
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Quote:
Originally posted by Brian Ratliff
If a pnumatic tire is compressed in one spot, the air pressure of the entire tire goes up, but not as much as the locallized air pressure in an airless tire.
The air in your tire is a shock absorber. Every bump is distributed around the whole rim, not just one spot.

I'd rather replace a tube than a rim. And the ride will be better, even given the "approximate" pressure of the airless tire.

I suggest asking around for many expert opinions before looking just to one place for advice about airless tires. Might save some bucks.

Last edited by Pete Clark; 09-05-02 at 07:04 PM.
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Old 09-05-02, 08:04 PM   #11
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Quote:
Originally posted by vlad
Have you heard of any instance that a bicycle tire damaged a rim?
Can you furnish specifics of the occason and describe the damage?

Since Nov 2001 I use the polyurethane/nylon microfoam tire that has no air tube. wwww.airfreetires.com Others who read my posts have asked at their local bicycle shop about airfree tires. They were told vaguely "they damage the rims".

In the nine months and 2000+ miles that I have ridden bicycles equipped with airfree tires I have not noted any damage to the rims.

Will my rims suddenly shatter? or perhaps crumble on a downhill whizzzzzz at 48mph to pitch me headlong into a cactus; or to die impaled on a highway reflector standard gurgling in agony for the amusement of fourteen tourists who stopped to photograph this once-in-a-lifetime visual treat?

????????

Nobody wants your crap....get lost.
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Old 09-05-02, 11:24 PM   #12
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Quote:
Originally posted by vlad
Have you heard of any instance that a bicycle tire damaged a rim?
Can you furnish specifics of the occason and describe the damage?

Since Nov 2001 I use the polyurethane/nylon microfoam tire that has no air tube. wwww.airfreetires.com Others who read my posts have asked at their local bicycle shop about airfree tires. They were told vaguely "they damage the rims".

In the nine months and 2000+ miles that I have ridden bicycles equipped with airfree tires I have not noted any damage to the rims.

Will my rims suddenly shatter? or perhaps crumble on a downhill whizzzzzz at 48mph to pitch me headlong into a cactus; or to die impaled on a highway reflector standard gurgling in agony for the amusement of fourteen tourists who stopped to photograph this once-in-a-lifetime visual treat?

????????
Haven't you beaten the dead horse enough yet?
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Last edited by Raiyn; 09-05-02 at 11:27 PM.
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Old 09-06-02, 06:06 AM   #13
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Seems to be an awful lot of bile here for BF! If not interested, there are lots of other threads...
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Old 09-06-02, 06:13 AM   #14
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I'm going to close this thread because it's basically spam.

For spam please don't reply just to be sarcastic or to tell the user he or she needs to beat it. The moderators are for keeping spam in check, not your rude replies.
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Last edited by coolio; 09-06-02 at 06:15 AM.
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