Iona Disko
Member Since: 04 Jul 2008
Location: NE
Posts: 286
  
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| Punctured MTR ran on low pressure - is it now damaged? |
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How much damage do you think will have come about from running a Goodyear MTR 255/55R19 below pressure?
I got a slow puncture while off-roading and it wasn't until I got the tell tale DSC cutting in unexpectedly that I thought to check. 20PSi when I looked and sitting pretty low and nearly rim on the sidewall.
The wall of the tyre was hot to the touch (it was around 6 deg celcius air temperature).
All that heat will have been generated in the side wall from the continual flexing. I reckon I had covered around 40km at average road speeds (45mph?) while the tyre was deflating.
I don't think I'll use that tyre again which is a shame as it is only half worn - I might put it on a trailer or use it as a spare.
There is no visible damage and the tyre has a regular shape - I haven't had it off the rim and the side wall feels firm.
Is there any way to check the condition of the tyre?
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 26th Oct 2008 6:59 pm |
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MacLeod 313
Member Since: 18 Apr 2008
Location: away
Posts: 10723
 
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Got to be honest, and my own opinion I would'nt run it at motorway speeds after that. If the sidewall does'nt show damage then it will be considerably weaker now, risking overheating and a blow out at higher speeds. The tyre will be fine off roading but too much of a risk really on the roads. Why not use it as a spare and by a replacement.
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| 26th Oct 2008 7:04 pm |
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Bodsy
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Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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I think theonly way to tell is to de-mount it, then you can ave a look at the inside. Bodsys Brake Bible
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| 26th Oct 2008 7:06 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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MTR's have Durawall which is basically a double strength sidewall. They can be run at low pressures for sand etc ISTR we had them down to 16..18 psi or so at Macanterra. It may require inspection but I wouldn't have thought you would have a problem. If in any doubt though ...run it as a spare  21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 26th Oct 2008 7:10 pm |
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Ken
Member Since: 20 Feb 2006
Location: Here
Posts: 10865
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As DG said
Check for cuts and bulges if none you should be fine
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| 26th Oct 2008 8:04 pm |
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Iona Disko
Member Since: 04 Jul 2008
Location: NE
Posts: 286
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Tyre has been inspected and it looks new on the inside of the sidewalls so I'm guessing that it is OK.
More confusing is the conflicting advice about the possibility of repair. The damage has come from something large penetrating the tread right in the centre. It is a longitudinal cut of about 5mm on the outside and narrowing to maybe 3mm on the inside.
The tyre specialists said that it couldn't be repaired as it was a split and not a puncture. But a mechanic looked at it and was surprised at this pesimistic prognosis.
The tyre is now off to be repaired by a company that specialise in retreading HGV tyres and I will see what happens to it.
Either way it is now resigned to life a spare for my trailer.
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| 27th Oct 2008 6:40 pm |
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MacLeod 313
Member Since: 18 Apr 2008
Location: away
Posts: 10723
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good idea to relegate it to a spare really. As a truck driver, I average 16 - 18 tyres per unit depending what trailer I pull, with a maximum weight of 44 tonnes which equates to roughly 2.5 tonne per tyre loaded, or approx 1.2 tonne per tyre empty.
The reason for these figures I have given are to point out that when I am empty I have less load per tyre than a D3, and if any are run flat, slightly under pressure, or damaged, as soon as I apply weight or speed the walls WILL heat up and WILL let go.
It just is'nt worth it mate to be honest, not even considering the D3 that will not survive a motorway blowout, its more of a concern that you and your family could be hurt for the sake of a new tyre.
Maybe being over causious of me, but I have seen it many many many times and would'nt want to say its safe when there is a 50/50 chance.
All that being said, at least you got a decent spare for offroading
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| 27th Oct 2008 8:20 pm |
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Ken
Member Since: 20 Feb 2006
Location: Here
Posts: 10865
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Dear Mr Truck Driver  (sorry) At least we dont retread our tyres  or recut the tread
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| 27th Oct 2008 8:38 pm |
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MacLeod 313
Member Since: 18 Apr 2008
Location: away
Posts: 10723
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We dont, all our tyres for retreading / cutting are sent away by ATS and go onto the IRISH market. Stobart send a truck there a week and is well known practice.
I am not sure why he does this though, I think it stems with the fact that Stobarts strive to have a accident free day, and tyres almost being the cause of most.
I have worked for some companys though that have recut tyres that have already been cut  , and NO haulier will cut the steering tyres, too much heat generated there Ken.
Valid point though, but does'nt apply to me
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| 27th Oct 2008 8:48 pm |
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Ken
Member Since: 20 Feb 2006
Location: Here
Posts: 10865
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I said dear Mr Truck Driver not Dear Mr Stobbie Pilot
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| 27th Oct 2008 9:15 pm |
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