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what destroyed my tyre?

Old 09-16-13, 03:23 PM
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daven1986
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what destroyed my tyre?

So on my way to work today, my tyre had a sudden failure. When checking for the cause of it, I found that a section about the size of a 20p or a dime (maybe slightly bigger) was worn all to the threads (there was a small hole the size of a presta valve all the way through, then the wear decreased as it spread out to the size mentioned above).

The rest of the tyre was absolutely fine. It was a specialized armadillo, so they are pretty thick.

I haven't been skidding on the tyre or anything silly like that, I know my crud buster mudguards rub slightly (a bit of duct tape) but that shouldn't cause failure in one place so concentrated like that. I can't imagine that running over something would cause that damage (maybe it would?).

Either way I'm curious as to what may have caused the issue. Unfortunately I don't have any pictures as I threw the tyre away and replaced it with a new one en route.

Any ideas?

Thanks

Daven
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Old 09-16-13, 03:26 PM
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No Cue without a pic.
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Old 09-16-13, 03:46 PM
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Thought that might be the case, it looked like it had been rubbing on something. maybe it is out of true and that part of the wheel was rubbing...

meh, just hope it doesn't happen again!
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Old 09-16-13, 04:04 PM
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Do you expect the tire to wear where it ISN'T rubbing?
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Old 09-16-13, 04:54 PM
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It's entirely possible that your tire (or wheel) was slightly eccentric so the high spot on the tire was rubbing in one place every time it came around. If this is true, you'd find a polished spot inside of your fender, because the tire does to it what it does to the tire.

My problem with this scenario is that unless you ride wearing headphones, you couldn't miss the sound of the rubbing once per wheel revolution. zzzzz, zzzzz, zzzzz, zzzzz.

The other times is see this kind of localized wear is with long skid patches. Kids with coaster brakes can chew through a tire in a couple long skids.

The third possibility applies only to fixed gear bikes set up with one of the classic no-no combinations such as 48/16 that divide one into the other. If you stop by backpedal pressure, every stop will happen with the wheel in one of two places (left foot back, or right foot back). You'll end up with two areas of excess tire wear, while the rest is pristine. This is why fixed bikes should never use 52/13, 42/14, 45/15 48/16 or 51/17. 47t was always a favorte chainring size because being a prime number it eliminated any possibility of wheel indexing.
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Old 09-17-13, 01:05 AM
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hmm I'm pretty sure the rubbing was more than once per revolution, but I'll check the inside of my mudguard as that is the most likely cause.

Thanks

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Old 09-17-13, 09:58 AM
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Originally Posted by daven1986 View Post
hmm I'm pretty sure the rubbing was more than once per revolution, but I'll check the inside of my mudguard as that is the most likely cause.

Thanks

Daven
I hope you find it, but still can't figure how you didn't hear or feel the rubbing while riding.
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Old 09-17-13, 10:53 AM
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With rim brakes, if the edge rim is bowed outward the brakes will grab in the same location. The same thing can happen with out of true rims.

The test is fairly simple. Tighten the brakes down until there's ~1mm clearance on both sides, then spin the wheel and see if it catches.
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Old 09-17-13, 11:31 AM
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riding the bike in a world of road hazards .. Poo Happens ..
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Old 09-17-13, 02:59 PM
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The tyre wear was on the top of the tyre, so don't think it would be from brake pads. I checked my mudguard and there is no shiny bit.

The rubbing was against a bit of duct tape, and I could hear it but because it was from duct tape I didn't bother with it. The duct tape has very little wear on it, so I highly doubt that the tyre would be completely worn to shreds while duct tape remained absolutely fine.

I guess as fietsbob says, poo happens.

Either way I have a new yellow tyre now, and a new bike on the way, and a nice shiny new drive train on this bike, so I'm just going to put this down to bad luck and move on

Thanks all,

Daven
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Old 09-17-13, 04:29 PM
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Originally Posted by daven1986 View Post
The tyre wear was on the top of the tyre, so don't think it would be from brake pads.
I hope I'm not putting words in his mouth, but the rim dent/brake pad reference wasn't about the pads themselves wearing the tire. When you have a blip in a rim, it causes maximum braking effort, and even wheel lock up every time the pads pass over it. So as you slow to a stop the wheel will tend to always lock and skid in the same place on the tire.

This is easy enough to diagnose since you'd feel and hear a pronounced pulsing at low to medium braking force.

One last possibility we didn't mention, is an eccentric wheel or tire, or a tire with a bulge due to poor seating or damage to the body plies. A sudden high spot ( or the area just past a low spot) would have a wear rate many times normal, so that may be the issue if there's no rub, or brake track issues. Uneven wear from out of roundness is a common problem with poorly mounted tubulars, which often creep so there's a fat and thin area on either side of the valve. Riders who don't attend to it can wear through a tire in a few hundred miles (if the valve doesn't tear out).
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Last edited by FBinNY; 09-17-13 at 04:42 PM.
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Old 09-17-13, 11:41 PM
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ah, I had misunderstood, thanks for clarifying. I don't notice any pad rub so I think that is out. Guess a bulge in the tyre is a possibility.

Thanks
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