RFT loss air completely

SilverZeus · 10-04-2023, 01:46 AM

One of my Pirelli P Zero lost air completely and I drove the car to the tyre shop. They told me if the tyre left with 10% or less of the air pressure then it needs to be replaced. They didn't even check the cause of the issue whether the valve or puncture.

I never heard about the 10% rule before. I thought the idea of RFT was that it could stand although it completely lost the air pressure. Has anyone heard about the 10% rule before?

How do they measure the 10%? They wouldn't even know what pressure I set initially.

AP · 10-04-2023, 01:52 AM

Not heard of 10% myself but I know that when the tyre is flat, although the tyre does indeed stand up, there is wear on the inside, it starts to break down

I learnt this the hardest years back when I had a fla tyre, I couldn’t pump it up and assumed it was an issue with the valve and drove about 400 miles on it which is way in excess of the 50 miles they quote as it’s maximum range deflated
They showed mine the tyre after it was replaced and rubber was coming off from the inside of the tyre walls so it’s days we’re numbered

50 miles I think based upon this is conservative for the life of the tyre deflated but the more you go over that, the more damage is done inside until it will present as an issue

Mixed views about rfts …

BLK.G20 · 10-05-2023, 11:42 AM

Never heard of that before. Don't see anything on Pirelli's website either mentioning that.

G22b58 · 10-08-2023, 01:25 AM

Tire Rack web site has compiled manufacturers policies:
https://www.tirerack.com/upgrade-gar...es-be-repaired

Tim 4723 · 10-11-2023, 02:08 AM

It's pretty standard that if you drive on a run flat with no pressure (or apparently less than 10% of recommended pressure) that you start damaging the tire. It's designed to survive that damage for a while and get you where you need to go but once that process has started tyre shops aren't supposed to repair it. The damage could keep getting worse and cause a failure.

If you know it's flat before driving then put some air in it and see if it will hold enough pressure to get to the shop. Same deal if you are out on the road and have a pump or can get to a petrol station. Could save you a fair bit of money.

EDIT: The Tire Rack link is interesting. Seems like some manufacturers are prepared to allow for repairs after the tyre has been inspected. That's a pretty big advantage compared to the brands that won't.

10-04-2023, 01:46 AM	#1
SilverZeus Private 6 Rep 62 Posts Drives: G20 330i M-Sport Join Date: Oct 2011 Location: Melbourne, Australia iTrader: (0)	RFT loss air completely One of my Pirelli P Zero lost air completely and I drove the car to the tyre shop. They told me if the tyre left with 10% or less of the air pressure then it needs to be replaced. They didn't even check the cause of the issue whether the valve or puncture. I never heard about the 10% rule before. I thought the idea of RFT was that it could stand although it completely lost the air pressure. Has anyone heard about the 10% rule before? How do they measure the 10%? They wouldn't even know what pressure I set initially. __________________ G20 330i M-Sport \| Portimao Blue \| Adaptive M \| M-Sport Brakes \| Retired: F30 328i M-Sport \| Estoril Blue \| Adaptive M \| M-Sport Brakes \| Bootmod 3 \| K&N Filter \| Remus Exhaust \| Rockford P300 Sub \| E90 320i LCI \| Black \| E90 323i M-Sport \| Titanium Silver \| Formula 1 Tint \| Evolve Technik ECU Tune \| K&N Filter \| Remus Powersound \| Focal K2 Power 100KRS \| Alpine 12" SWS-1223D \| Alpine MRX-M50 \|
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10-04-2023, 01:52 AM	#2
AP Major General 2782 Rep 5,095 Posts Drives: G30 M550 Join Date: Apr 2011 Location: UK iTrader: (0)	Not heard of 10% myself but I know that when the tyre is flat, although the tyre does indeed stand up, there is wear on the inside, it starts to break down I learnt this the hardest years back when I had a fla tyre, I couldn’t pump it up and assumed it was an issue with the valve and drove about 400 miles on it which is way in excess of the 50 miles they quote as it’s maximum range deflated They showed mine the tyre after it was replaced and rubber was coming off from the inside of the tyre walls so it’s days we’re numbered 50 miles I think based upon this is conservative for the life of the tyre deflated but the more you go over that, the more damage is done inside until it will present as an issue Mixed views about rfts …
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10-05-2023, 11:42 AM	#3
BLK.G20 Lieutenant 210 Rep 419 Posts Drives: 2023 M340 Xdrive, 2023 M3CX Join Date: May 2023 Location: New Jersey iTrader: (0)	Never heard of that before. Don't see anything on Pirelli's website either mentioning that.
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10-08-2023, 01:25 AM	#4
G22b58 First Lieutenant 94 Rep 380 Posts Drives: G22 Join Date: Apr 2021 Location: Europe iTrader: (0)	Tire Rack web site has compiled manufacturers policies: https://www.tirerack.com/upgrade-gar...es-be-repaired
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10-11-2023, 02:08 AM	#5
Tim 4723 Private 41 Rep 66 Posts Drives: BMW G20 330i Join Date: Sep 2023 Location: Sydney iTrader: (0)	It's pretty standard that if you drive on a run flat with no pressure (or apparently less than 10% of recommended pressure) that you start damaging the tire. It's designed to survive that damage for a while and get you where you need to go but once that process has started tyre shops aren't supposed to repair it. The damage could keep getting worse and cause a failure. If you know it's flat before driving then put some air in it and see if it will hold enough pressure to get to the shop. Same deal if you are out on the road and have a pump or can get to a petrol station. Could save you a fair bit of money. EDIT: The Tire Rack link is interesting. Seems like some manufacturers are prepared to allow for repairs after the tyre has been inspected. That's a pretty big advantage compared to the brands that won't.
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