BigJimnyMeet (North) 2024 (12 Jan 2024)

BigJimnyMeet 2024

14th July 2024
Parkwood Nr. Leeds

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None beadlock tyre pressure

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Lambert
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The quickest Jimny in Harrogate...(that I own)

07 Sep 2022 05:43 #244886 by Lambert

None beadlock tyre pressure was created by Lambert

I neither have nor want beadlock wheels but I do have higher load rated all terrain tyres. At the parkwood meet I was running on 15psi and it was great but in terms of the load rating I was only actually 6psi below what the tyre would recommend for road use. This is obviously accepting the tpms having a fit. What I'm looking for is what is the lowest pressure I might consider without popping a bead off? I know there's a lot of variables and freak occurrences but as a ball park figure is 12 safe or even 10?

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saxj
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07 Sep 2022 12:16 #244888 by saxj

Replied by saxj on topic None beadlock tyre pressure

I have 235/75R15's on stock rims. I run them at 7psi off-road and have never debeaded a tyre.

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Lambert
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The quickest Jimny in Harrogate...(that I own)

07 Sep 2022 13:27 #244889 by Lambert

Replied by Lambert on topic None beadlock tyre pressure

So 10 on a 205.70 should be good as long as I keep my head on straight.

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yakuza
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08 Sep 2022 07:41 - 08 Sep 2022 07:46 #244896 by yakuza

Replied by yakuza on topic None beadlock tyre pressure

Mine on BFG MT 235-75-15 on stock alu rims gets down to 3-6 PSI or 0.2 to 0.4 bar as i use for a measure. Bear in mind that cheap pressure gauges may have large errors but I unscrew the valves and reinsert them when I am happy with the bulge on the bottom part of the tire and measure the pressure.
Usually I keep a bit more air up front than rear because that is where the most risk of ripping them off is i guess. I have never lost the pressure. (as far as i know.)
I have however often lost the balancing as I suspect the tire rotates on the rim a bit so the balancing weights on the rims loose their position according to the tire. Driving to the offroad events is ok and on the return trip, a wole lotta shakin sometimes. I air up for the road of course.

Edit: But I do suspect my tires have recieved damage from running that low. There is this strange pulsating/oscillating sound from them now.

Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.

Last edit: 08 Sep 2022 07:46 by yakuza.

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08 Sep 2022 07:51 #244897 by yakuza

Replied by yakuza on topic None beadlock tyre pressure

Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.

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Lambert
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The quickest Jimny in Harrogate...(that I own)

08 Sep 2022 09:37 #244898 by Lambert

Replied by Lambert on topic None beadlock tyre pressure

As is often the case just because a bfg mud will stand it it doesn't mean that my radar renegade necessarily is going to do the same. I think I will try 10 and see where I am at.

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08 Sep 2022 09:54 #244899 by saxj

Replied by saxj on topic None beadlock tyre pressure

I have heard of Jimny's running BFG A/T's debeading. The BFG's have a very stiff sidewall and I think that is a contributing factor.

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Lambert
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08 Sep 2022 10:32 #244900 by Lambert

Replied by Lambert on topic None beadlock tyre pressure

Like I said many variables. The radar renegade at5 are only a 100 load index so not too stiff. And they also have reasonable side biters so I could be in with a chance of them being good. Aldermaston will be the test.

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300bhpton
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10 Sep 2022 16:29 #244921 by 300bhpton

Replied by 300bhpton on topic None beadlock tyre pressure

For trials use we allow 12psi in CCV events. Occasionally you see a few coming off the rim. But not that often. Although many competitors will run with tubes in for extra assurance. I’d say anything below 12psi is probably a gamble.

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