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BigJimnyMeet (North) 2024 (12 Jan 2024)


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Puncture susceptibility

  • Lambert
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17 Aug 2021 05:37 #237625 by Lambert
Replied by Lambert on topic Puncture susceptibility
Also the lower profile tyre will be constructed differently with a stronger side wall as they are intended to improve turn in for corners. Taller profile tyres are intended to flex more so have a relatively lower sidewall strength, however when over inflated the tyre can't mold round obstacles to the same degree so damage can occur quite easily.

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17 Aug 2021 10:23 #237642 by 300bhpton
Replied by 300bhpton on topic Puncture susceptibility

Thanks for all your helpful replies. My wife has been driving it (hence the economy!) but I understand it was sharp stones piercing the sidewalls. I think the rims and valves are OK. What I did notice was the tyre fitters had inflated the repaired tyre well above the recommended pressure last time it was in there. I do find it odd however that I can drive up and down that forest road in an old Golf and Kia Picanto with ordinary road tyres and never get a puncture yet the Jimny attracts them like a magnet. No sexist comments now....!

I'd say it is a little odd. The stock tyres aren't all that bad and you see lots of people off roading the Jimny on them on YouTube. If you normally drive cars on the same terrain and suffer no tyre damage, I'd suggest the Jimny is maybe being driven somewhere slightly differently or in a way causing the issues.

If it really is side wall punctures (which would take some effort on gravel). Then a tougher tyre would certainly be a wise choice. Are there any rutted areas or places where you could essentially curb a tyre on a jagged rock edge? Is it the same tyre or side of the vehicle that suffers punctures?

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17 Aug 2021 10:40 #237644 by Dan
Replied by Dan on topic Puncture susceptibility
When I go out to the woods its about a five mile round trip on forestry tracks.

For a year or so I was perfectly happy with the highway terrain duellers and fortunately had no punctures.

On changing to A/T tyres I noticed that on gravel it was easily achievable to be one gear higher than before.

The trade off is that on the road in the wet you lose a bit of grip where there used to be more.

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17 Aug 2021 14:19 #237659 by Busta
Replied by Busta on topic Puncture susceptibility
I'd say it has very little to do with the tyre size, type, vehicle etc. Tyre pressure could be a factor, but it's much more likely to be to do with whichever rock it is that keeps ripping the sidewalls. It would be worth walking the track to see if you can find the offender. Maybe the Jimny is being driven along a different "line" to the other cars? There's absolutely no reason why a Jimny tyre would be more susceptible to punctures than a Golf, Kia or whatever else. It certainly won't be because the Jimny is "sinking in" further than other vehicles. Quite the opposite will be true. And whilst many AT and MT tyres have reinforced sidewalls to resist punctures, they are not necessary for a track that you can drive a VW Golf along.

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19 Aug 2021 21:15 #237719 by Micheal
Replied by Micheal on topic Puncture susceptibility
Thanks again to all
Apparently the punctures are through the tread, not sidewall. The forest roads around here are not really gravel but what is called Type 1 surfaced crushed stone. Type 1 is quite small and should not be a threat to almost any tyre but what happens is that stone is put on over some stretches which is the next coarser grade, can be as much as fist size and with sharp edges. Timber trucks usually beat this down fairly quickly but some stays sharp and I think it is this stuff that is puncturing the standard Jimny tyres. Still remains a mystery why the Jimny suffers while the Golf/Picanto have never had a puncture. Anyhow thanks for all suggestions, we will try AT tyres when changing next. Any idea of the cost of these?

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19 Aug 2021 22:57 #237721 by Groundworker
Replied by Groundworker on topic Puncture susceptibility
Can't help you with the punctures, but type 1 is a designated stone, actually it's MOT type 1 which has a very tight specification. The stone will be max 40mm and down with a certain amount of dust included. It's generally granite from Leicester area, but any stone can be type 1 if it passes a crush test.
I got involved with Land Rover experience a few years ago and they had problems with a stoned up road around the site which was shredding their tyres.
Interestingly, the fast lane blog in US just managed to wreck two tyres on a new Defender within about 5mins on rocks due to low profile tyres, pinched against rim on sidewall.

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20 Aug 2021 08:05 #237727 by Scimike
Replied by Scimike on topic Puncture susceptibility
Nothing different about the Jimny or the stock tyres, it's just the fickle finger of fate have a go at you, or just bad luck....

That said, only ever had two punctures in my driving life so far. Back in the 80's on my student financed MK1 Escort on its remoulds (remember them!)
Roll forward many years and a few weeks ago on my new AT tyres fitted to the Jimny.

Maybe the Jimny is the problem

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20 Aug 2021 08:20 #237728 by DrRobin
Replied by DrRobin on topic Puncture susceptibility

Thanks again to all
Apparently the punctures are through the tread, not sidewall. The forest roads around here are not really gravel but what is called Type 1 surfaced crushed stone. Type 1 is quite small and should not be a threat to almost any tyre but what happens is that stone is put on over some stretches which is the next coarser grade, can be as much as fist size and with sharp edges. Timber trucks usually beat this down fairly quickly but some stays sharp and I think it is this stuff that is puncturing the standard Jimny tyres. Still remains a mystery why the Jimny suffers while the Golf/Picanto have never had a puncture. Anyhow thanks for all suggestions, we will try AT tyres when changing next. Any idea of the cost of these?
 
The tyres on my Jimny seem to act like magnets for small stones, I am always noticing them stuck between the treads, most are only a few millimeters and get stuck in the small slits in the tread blocks, but the odd one is a bit bigger (5-6mm) and gets stuck between the tread blocks.  A small screwdriver or even a small key will bring them out.

Perhaps you get a sharp stone stuck and then when out on the tarmac, the pressure just pushes it in to the tyre.  My guess would be a stone about 6 - 8mm or so diameter, but perhaps longish, stuck between the tread blocks, the road then pushes it in to the tyre and the result is a puncture.  The puncture would happen with the car away from home.

As for AT, lots of the Bridgestone do the Dueler in AT, I have these on the front and now have Yokohama Geolandars on the rear, both are around £80 fitted, if you shop about.  I am not sure how much stronger an AT tyre will be between the treads, it's probably not something that is quoted, but it worth a try.
 

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20 Aug 2021 13:17 #237737 by saxj
Replied by saxj on topic Puncture susceptibility

Thanks for all your helpful replies. My wife has been driving it (hence the economy!) but I understand it was sharp stones piercing the sidewalls. I think the rims and valves are OK. What I did notice was the tyre fitters had inflated the repaired tyre well above the recommended pressure last time it was in there. I do find it odd however that I can drive up and down that forest road in an old Golf and Kia Picanto with ordinary road tyres and never get a puncture yet the Jimny attracts them like a magnet. No sexist comments now....!
As far as I am aware, you can't safely repair the sidewall of a tyre. 

As mentioned, over inflation will make the tyre much more prone to sidewall damage.

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