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OK to patch a tire?

Old 07-13-15, 07:43 AM
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XXLHardrock
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OK to patch a tire?

Have a 3/8" cut on my rear tire that goes right through and the tube sticks out of at full PSI. Is it OK to patch it from the inside and keep riding or should I toss it?
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Old 07-13-15, 07:47 AM
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You cannot 'patch' a tire - you can 'boot' a cut tire, which is basically a patch with strong enough fibres to support the damaged tire casing. If there is any bulging or deformation on the outside of the tire when inflated, you need a boot.

If the cut in the tire is so small that there is no bulging or deformation, you can patch or otherwise seal up the hole in the tread to keep debris from entering the tire and damaging the tube.
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Old 07-13-15, 07:54 AM
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You normally boot a tire as a way to get home. Once home the tire is replaced.
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Old 07-13-15, 07:57 AM
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If you can write here you can order a New Tire.
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Old 07-13-15, 07:59 AM
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Originally Posted by XXLHardrock View Post
Have a 3/8" cut on my rear tire that goes right through and the tube sticks out of at full PSI. Is it OK to patch it from the inside and keep riding or should I toss it?
As Wilfred said, use a boot. And yes, between the tube and the tire. A tube patch will NOT work. The boot has got to be of a sturdy material. A small section from an old tire will do.
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Old 07-13-15, 08:04 AM
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You should try a patch...Sometimes they hold. Most of the time they don't.



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Old 07-13-15, 08:11 AM
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Years ago, after reading on BF about the possible need for a tire boot, I thought I was pretty clever in cutting some 2" squares from an old tube and carrying them for emergency booting. I did not yet understand that a boot needs to be NON-stretch material.

Well, one day 20 miles from home, I rode through some harmless looking debris in the bike lane, and found a massive chuck of glass that sliced open the sidewall. I replaced the tube, and put my improvised tire boot inside. Upon pumping up the tire, the "boot" bulged out through the cut. It looked bad, but I did make it home.

I now carry the Park TB-2 boots. A year ago, I had to use one. The cut was so bad I could shove my whole thumb through, and I didn't think a boot would work. But it did!
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Old 07-13-15, 08:17 AM
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Booted this cut with a Parks Boot...It lasted for 300 miles.

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Old 07-13-15, 08:19 AM
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You can cut them with scissors to make a small one.

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Old 07-13-15, 08:21 AM
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If the fabric reinforcing threads are cut, which sounds like the case, the tire is a goner. You MIGHT be able to get away with riding a booted tire for a while but you should get a replacement in hand and installed ASAP as it is likely to fail completely sooner rather than later.
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Old 07-13-15, 08:25 AM
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I wonder if adhesive-backed fabric (a patch from the fabric store) might make an acceptable boot. I found a small cut in my tire last summer while on a long road ride, and I just happened to have a strip of adhesive backed Velcro in my handlebar bag which worked fine as a boot to get me home... and for several hundred kms after.
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Old 07-13-15, 09:03 AM
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I recently did some "long-term" testing of a Park Boot.

I had a Marathon tire that picked up a good size chunk of glass in the first 50 miles.

  • The full size boot didn't flex enough with the tire and caused the tire to bump. Cutting the boot in half fixed that.
  • At about 1000 miles, the boot wore through the tube. The crisp edges of the boot and the changes in flex caused the tube to wear right down the edge of the boot (also essentially making it unpatchable).
  • I had some electrical tape with me so I did a quick roadside covering of the boot and edges with tape. This worked for a while, but delaminated the boot and made a big mess.
  • I also somehow got a hole that developed through my hole in the tire, through the boot, and 50% through the tube.

Anyway, the Park Boot seemed fine for temporary use, but seems to be lacking as a long-term installation.

I'm sill looking for some kind of reinforced alternatives.

I also now testing super glue to patch numerous small holes in another tire, and it seems to be pretty stable.. Next to try the big hole with superglue.
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Old 07-13-15, 09:54 AM
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Originally Posted by Wilfred Laurier View Post
I wonder if adhesive-backed fabric (a patch from the fabric store) might make an acceptable boot. I found a small cut in my tire last summer while on a long road ride, and I just happened to have a strip of adhesive backed Velcro in my handlebar bag which worked fine as a boot to get me home... and for several hundred kms after.
Anything strong enough to resist the pressure of the tube from blowing out the cut in the tire will work. I've booted tires with dollar bills, Clif Bar wrappers, part of a Capri Sun pouch I found on the side of the road where I got my flat, Gorilla Tape, and pretty much anything other than an actual Park tire boot.
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Old 07-13-15, 11:39 AM
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I've used standard innertube patches inside a tire with good results. The hole was about 2mm in diameter with a perfectly round little divot taken out of the tread of a 28mm tire on a hybrid bike. Used the largest Parks innertube patch I had. Cleaned the inside of the tire with some acetone and let it dry before scuffing it with sandpaper. After the patch was cured I filled the divot with a dab of Shoe Goo and the tire lasted another few hundred miles and was still holding when I replaced it because of overall wear, not the patch. I wouldn't recommend this for general tire repair, but if you live out in the sticks and it will be a few days to get a new tire, it could get you by for a while. I'd move the tire to the back if it isn't already there.
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Old 07-13-15, 12:00 PM
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As said above, boot the tire and inflate it to normal pressure. If it's deformed, replace it.
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Old 07-13-15, 12:08 PM
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Originally Posted by CliftonGK1 View Post
Anything strong enough to resist the pressure of the tube from blowing out the cut in the tire will work. I've booted tires with dollar bills, Clif Bar wrappers, part of a Capri Sun pouch I found on the side of the road where I got my flat, Gorilla Tape, and pretty much anything other than an actual Park tire boot.
How well did gorilla tape work? This actually sounds like one of the few good viable uses for the stuff.
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Old 07-14-15, 11:30 AM
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Originally Posted by Marcus_Ti View Post
How well did gorilla tape work? This actually sounds like one of the few good viable uses for the stuff.
Works as well as any other boot. My suggestion is to place a little strip of the tape glue-to-glue on the back of the boot where it will cover the hole in the tire, so you don't have exposed glue through the hole, just gathering road grit.
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Old 07-14-15, 02:10 PM
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Booting a tire involves a few variables. Of course you'll do whatever it takes to get home, but after that things depend on the length and direction of the cut. On high pressure tires the greatest stress on the walls is across the tube, so cuts that are lengthwise are more likely to tear open again than cuts that are cross wise (parallel to the direction of pressure stress). Possibly why the tire photoed above held up so well)

There's also the length of the cut to consider, and the amount of damage to the tire at the ends of the cut, where fabric may already be pulling apart. Lastly, since your boot depends on the shear strength of the adhesive, there's the amount of bonding area on both sides of the cut to consider.

For that reason, it's usually more possible to save a decent tire with a cut in or near the tread, than one with a cut close to the bead, especially if that's a long cut parallel to the bead.

3/8" is pretty long, and I'd probably only try to save it as an alternative to walking, and reserve long term boots to nice tires that are better candidates for salvage.
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Old 07-14-15, 03:57 PM
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When I had less money and more time, I sewed damaged tires up. Sometimes it would work and sometimes it didn't, but even if it did, I considered it a short term solution.
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Old 07-14-15, 06:35 PM
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You usually just "boot" the tire long enough to get you back home and then toss that tire, unless you enjoy the thrill of possibly repeating the task along the road somewhere again. I had to cut a piece of plastic out of a plastic soda bottle that was laying nearby the scene of the blowout. The piece of plastic held in place by a piece of "Duct Tape" did the job. Only needed to last about 10 miles, but it sure beat hitching a ride from the right person. I've known people that used a folded dollar bill to boot their tire, and it worked fine. Usually if the tube does come through the tire casing like you saw, the tube will blow out again.
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