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  #1  
Old 02-20-2020, 10:11 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Repair too close to the sidewall or within range?

Iím on the fence with this repaired run flat tire. Looks to be near the acceptable/not acceptable part of the tread. I have used repaired tires before and this one has 10mm of tread left. I would hate to waste it. All in all, safety first. Your thoughts?Click image for larger version

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  #2  
Old 02-20-2020, 03:44 PM
ArgentoCarNut ArgentoCarNut is online now
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Old 02-20-2020, 04:42 PM
Autoputzer Autoputzer is offline
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A reputable shop wouldn't touch that. They'd be afraid of personal injury attorneys.
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Old 02-20-2020, 05:17 PM
ArgentoCarNut ArgentoCarNut is online now
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Repair too close to the sidewall or within range?

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Originally Posted by Autoputzer View Post
A reputable shop wouldn't touch that. They'd be afraid of personal injury attorneys.


I have always heard that, but every time I ask to see the fine print, they are unable to produce paperwork supporting this... not to get all tinfoil-hat on this, but sure looks like they prefer the revenue from the new tire (and in many cases, Iíve heard them say they would not put one new tire on a car with AWD citing differences in diameter between new and used tires...).

The RFT would take this and much more without any issues. Iíve put plugs and patches on worse spots, on standard tires that really got abused - meaning used with low pressures on sand and rock, and loaded to the gills on gravel roads. Never had a single one fail in over half a million kms


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Old 02-20-2020, 06:08 PM
BabyUnicornTaco BabyUnicornTaco is offline
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My priority is safety. Some shops do have their own unwritten rules on repaired tires. Looking at the structure of run flats I would think that this might fall within acceptable (non sidewall) limits. Not sure though. I am perfectly comfortable with patched tires for a small puncture. I do wonder if it would compromise the ďrun flatĒ ability.


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Old 02-20-2020, 07:34 PM
Autoputzer Autoputzer is offline
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Quote:
Originally Posted by ArgentoCarNut View Post
I have always heard that, but every time I ask to see the fine print, they are unable to produce paperwork supporting this... not to get all tinfoil-hat on this, but sure looks like they prefer the revenue from the new tire (and in many cases, Iíve heard them say they would not put one new tire on a car with AWD citing differences in diameter between new and used tires...).

The RFT would take this and much more without any issues. Iíve put plugs and patches on worse spots, on standard tires that really got abused - meaning used with low pressures on sand and rock, and loaded to the gills on gravel roads. Never had a single one fail in over half a million kms


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You're right. I looked on the Michelin, Bridgestone, Tire Rack, and the U.S. Tire Manufacturers Association websites, and couldn't find prohibition of repairing a puncture in the tread between the outside circumferential channel and the shoulder of the tread. Although, I had a puncture near the edge and Tire Rack replaced the tire under their two-year road hazard warranty.

I had a proper plug-patch puncture between two circumferential channels fail after about 35k miles.

AWD systems need the tires to have very similar rolling diameters. Otherwise, there's a stead grind on the clutches in the transfer case. Requirements vary by vehicle manufacturers, but it's usually around 2/32" difference or less. But, you can get a new tires shaved to match the tread depth and rolling diameter of the existing tires. I've had that done by Tire Rack for $35.

High performance tires wear a lot faster when they're new. All tires wear faster when new, but high-performance tires wear a lot faster when new. So, it's a good idea to have the new tire shaved with an extra 1/32" of tread on them. With the faster wear, the new tire will catch up with the old ones.
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Old 02-20-2020, 08:19 PM
ArgentoCarNut ArgentoCarNut is online now
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Quote:
Originally Posted by BabyUnicornTaco View Post
My priority is safety. Some shops do have their own unwritten rules on repaired tires. Looking at the structure of run flats I would think that this might fall within acceptable (non sidewall) limits. Not sure though. I am perfectly comfortable with patched tires for a small puncture. I do wonder if it would compromise the ďrun flatĒ ability.


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I am absolutely certain the structural design of the RFT is capable of withstanding much more punishment than that. These are built for insane demand specifications.


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Old 02-24-2020, 05:37 AM
gkski gkski is offline
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One thing seems odd to me. The outside photo looks like the damage is far enough away from the sidewall whereas the interior tire photo looks like the damage is much closer to the sidewall. All perspective, I guess.
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Old 02-24-2020, 04:27 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Quote:
Originally Posted by gkski View Post
One thing seems odd to me. The outside photo looks like the damage is far enough away from the sidewall whereas the interior tire photo looks like the damage is much closer to the sidewall. All perspective, I guess.

Itís a combination of the angle and the repair method. A circle is sanded out and then patched. Iím not going to use it. I decided to buy a new set of 4 tires. Making the switch to NON run flats.


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Old 02-24-2020, 04:32 PM
gkski gkski is offline
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Just checking my understanding. Normally you would plug it first to get on the road, then take it to a tire shop for the interior repair which if I recall uses a Dremel on the area, then a circular patch?
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Old 02-24-2020, 04:33 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Repair too close to the sidewall or within range?

Quote:
Originally Posted by gkski View Post
Just checking my understanding. Normally you would plug it first to get on the road, then take it to a tire shop for the interior repair which if I recall uses a Dremel on the area, then a circular patch?


Yup. If itís a run flat and holding pressure you can skip the plug though. Plugs hold really well on run flats.


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Old 02-24-2020, 04:45 PM
gkski gkski is offline
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I would think running the runflat withot a plug would ruin the tire, i.e., no chance of repair whether recommended or not.
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Old 02-24-2020, 04:56 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Quote:
Originally Posted by gkski View Post
I would think running the runflat withot a plug would ruin the tire, i.e., no chance of repair whether recommended or not.


If you get a nail or screw in the tire and the pressure holds pretty well the run flat will hold for a while. Longer than a non run flat. Running a run flat on low pressure will ruin the tire eventually. It makes a crease where the sidewall meets the part of the tire that touches the road and makes the rubber flake off into beads on the inside. Out of at least 10 punctured run flats I have only had one become damaged internally. All others were patchable.


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