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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 03-25-07, 03:12 PM   #1
hyunelan2
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Is this tire ruined?

I have exactly 64.5 miles on this tire, which makes me angry. Today, out of nowhere, thumpthumpthump - the back tire goes flat. It's a Maxxis Detonator 700x25, which is supposed to be pretty durable. So I change out tubes, ride maybe 50yards, thumpthumpthump. Another flat. I inspected the tire, and saw nothing looking like a cause. I did end up finding a puncture in the tire.

Is this tire shot? Can it be used(by putting a patch or something on the inside. From the outside it looks bad, only if I squeeze it (like in the picture). The inside doesn't look all that bad. Is it trash?


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Old 03-25-07, 03:16 PM   #2
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Patch it and it should be fine, I have lots of cuts like that in my BMX tires from glass and such, never thought twice about them.
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Old 03-25-07, 03:19 PM   #3
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It's fine. There are probably a half dozen such holes in my rear tyre. Just patch up the tube and keep on riding.
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Old 03-25-07, 03:49 PM   #4
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Those threads you see on the inside are the casing, and those are the structurally important parts. If they are cut, then the tire may not be safe. If the threads are cut, you can try putting a boot--some sort of patch--over the inside of the tire, then try re-mounting it with a fresh tube and inflating to pressure. If the tire bulges at the cut, it's probably risky. If not, then you're probably okay, but keep an eye on it.
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Old 03-25-07, 03:59 PM   #5
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As long as the tube is not pushing out of the hole, throw a tire boot on it and ride.
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Old 03-25-07, 04:05 PM   #6
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That's a tiny cut. It's fine.
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Old 03-25-07, 04:54 PM   #7
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Were the holes in the tubes at the same place this cut was? It is
always a good idea to remember how the tube relates to the tire
when you pull it out for exam so you can correlate any foreign
bodies in the tire to the tube and remove said FB. I replaced a
tube yesterday in a tire and inflated it and 15min later it flatted
in 2 secs, whoosh... Exam of tire and tube lead to the conclusion
that the rim tape was slightly off center (OEM Hutchinson plastic
stuff, not glued unfortunately) exposing a few holes enough for the
tube to herniate into the spoke hole and blow. The cut you
picture looks small enough on the inside of the tire to be unlikely
to allow the tube to herniate through to the outside. Just a
suggestion to re evaluate the scenario to be sure the cut was the
cause. Otherwise I agree with others, cut is not enough to be a
concern, just put a tube patch over it and tire is good to go.
Carcass cuts are a concern if large enough to be bulged by the
tube even when booted from the inside. A bulgy tire is annoying
to ride on and may catastrophically fail.
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Old 03-25-07, 06:06 PM   #8
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Thanks everyone. The 2 tubes both had very small puntures in them. After the second failure is when I was able to correlate the location of the hole in the tube to the cut in the tire. Whatever caused it was probably still stuck there when I put in the second tube, causing the failure.

Beleive it or not, this is only my second (and third, I suppose) flat, ever. All of last year, I had only one flat when a car ran me off the road onto a gravel shoulder, which the side of the asphalt cut into the tube. Next time I'll definately be sure to inspect for FB more carefully.

I put a patch on the inside of the tire, installed a new tube and just did a few laps around the block without any problems. I'll keep an eye on it though. Thanks again.

EDIT:
After reviewing this picture I just took of it, I don't think I like the way it looks, and might order a replacement here.

Last edited by hyunelan2; 03-25-07 at 06:20 PM.
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Old 03-25-07, 09:47 PM   #9
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Just don't over pressurize the tire. Should be fine.
In the future when you get a flat take the tire completely off and run your fingers around the inside to the tire to check for anything that may have caused the original flat (wire, glass, goats head sticker, etc). Also check to see if there is a cut on the inside. Wrap a Dollar bill or a used gel pac around the inner tube where there is a cut. This will usually get you home even with severe sidewall cuts.
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Old 03-25-07, 10:26 PM   #10
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Quote:
Originally Posted by hyunelan2
Thanks everyone. The 2 tubes both had very small puntures in them. After the second failure is when I was able to correlate the location of the hole in the tube to the cut in the tire. Whatever caused it was probably still stuck there when I put in the second tube, causing the failure.

Beleive it or not, this is only my second (and third, I suppose) flat, ever. All of last year, I had only one flat when a car ran me off the road onto a gravel shoulder, which the side of the asphalt cut into the tube. Next time I'll definately be sure to inspect for FB more carefully.

I put a patch on the inside of the tire, installed a new tube and just did a few laps around the block without any problems. I'll keep an eye on it though. Thanks again.

EDIT:
After reviewing this picture I just took of it, I don't think I like the way it looks, and might order a replacement here.
I had a similar experience last year about 65 miles into a century; I went over some glass or something and flatted the rear. It was no problem to pop a spare tube in, but I was worried about the cut in the tyre casing, although the cords were intact; I fitted a Tyvek™ patch which I'd made from an envelope (you can also make a patch from a used toothpaste tube), and I completed the ride OK. I ran the tyre at a slightly lower pressure, but decided the cut was bad enough to warrant replacing the tyre, which was most annoying as the tyre was almost brand new! The cut on your tyre doesn't look as bad as the one on mine, but I think I'd still replace it.

- Wil
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Old 03-26-07, 09:57 AM   #11
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Another option is to put it on the front, where the tire is more lightly loaded
and less stressed. What I can see in your pix does not look alarming, Tread
cuts are inevitable, and after 1000mi any tire will have 2-3. Bad tread cuts
(like WD's) are not uncommon causes of premature tire discarding, in my
experience about 20-25% or tire discards are from cuts.
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Old 03-26-07, 10:06 AM   #12
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Quote:
Originally Posted by sch
Another option is to put it on the front, where the tire is more lightly loaded
and less stressed. What I can see in your pix does not look alarming, Tread
cuts are inevitable, and after 1000mi any tire will have 2-3. Bad tread cuts
(like WD's) are not uncommon causes of premature tire discarding, in my
experience about 20-25% or tire discards are from cuts.
With respect, I would definitely NOT put it on the front! Blow-outs on the rear are far less dangerous than blow-outs on the front!

- Wil
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Old 03-26-07, 10:58 AM   #13
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True but the point is the tire is not a significant hazard as
pictured. If minor cuts such as the OP showed were a
problem I would advise discarding, I don't think they are,
and cuts such as this will occur every 500 to 1000mi, esp
on the rear where most of the weight is distributed. If you
have a professional team budget, sure toss the tire, if you
are like most of us a $30 tire will hopefully last 3-4kmi.
Your cut, if into the carcass falls into the discard category.
I second your idea of using tyvek patches to get the tire
home, a lot cheaper and stronger than using currency.
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Old 03-26-07, 11:16 AM   #14
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Instead of throwing it out, keep in on the back and go to an empty parking lot (within walking distance of home) and practice bike handlng skills, excessive skidding and slide outs, etc until you blow thru the tire.

Just make sure no one is watching

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Old 03-26-07, 02:30 PM   #15
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I've repaired cuts up to 1/4" by using the Tyvek race numbers:

1. rough-up the inside of the tyre with sandpaper, like stuff included in patch kits.
2. cut up two pieces of Tyvek, nickle and quarter sized
3. use 3M Fastak Super Weatherstripping adhesive, I always have a tube around for sew-up tyres
4. follow instrucitons and lay down layer on both Tyvek patch and tyre, let get tacky.
5. add on more thin layer Fastak and apply patch.
6. Use handle of screwdriver to "roll" over patch to apply pressure
7. Apply 2nd patch the same way
8. sprinkle some talc powder to make excess Fastak not sticky
9. clamp lightly between two pieces of wood in vice for a couple hours



The Tyvek and Fastak actually transmits the load from the cut casing threads across the cut. You'll notice that the dark stripe in the picture at the cut is skewed into an S shape? With the Tyvek patch on teh tyre, that area will be straight.
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Old 03-26-07, 02:55 PM   #16
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Thanks for the idea, DannoXYZ - I still have the cut tyre, and still moan about the fact it was almost new. I have some Tyvek patches, but I'll need to look around for the adhesive (maybe the local Home-boy Despot).

- Wil
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Old 03-26-07, 02:58 PM   #17
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Put it on the back because it will be safer should it fail and it wears faster so you be rid of it sooner. End of story.

On my fixed gear, the rear Michelin Carbon had several larger cuts and gashes all over it from skidding and sliding everyday. They were never a problem.
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Old 03-26-07, 05:25 PM   #18
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I didn't see anything about that tire that would cause me to stop using it. The cut is quite small and it doesn't appear to have compromised the strength. The truly paranoid would fill the slit with rubber cement to prevent an easy path for debris to find it's way to the tube, but that really isn't necessary. I have ridden a lot worse for a many, many miles without problem. If I replaced every tire that had a little cut, I'd be in the poor house in no time.
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Old 03-26-07, 07:57 PM   #19
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By the way, DannoXYZ, I tried putting two pieces of Tyvek inside the tyre, glued as you suggest but with regular rubber cement; there's still a bulge at 80psi, and I haven't been brave enough to take it higher. Would it make a difference to use Fastak? (I haven't had a chance to shop since the last posting). I don't think I'd like to ride it as is…

- Wil
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Old 03-28-07, 01:36 AM   #20
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Well, I tried it with some goop I got from the local auto shop (Permatex Contact Cement); very strong (totally impossible to remove the patches) and dries flexible; I think with a smaller cut it might work perfectly, but in my case the cut still opens slightly and I don't think I'd like to risk it above 80psi; in other words the tyre is hosed! bummer!

- Wil
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Old 03-28-07, 04:04 AM   #21
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Wil!! That tire is fine! Quit agonizing over it! You are making this way too much of an issue. I personally have larger cuts on both tires right now. I have them both pumped up to 130psi. And I have ridden them both like that everyday for the last 4 months.

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