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Tyre pressure

General Tech Talk

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How low can I go? 10psi on sand 15psi on rocks

Higher
11
37%
Lower
19
63%
 
Total votes: 30

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Tyre pressure

Post by Busiboy »

Hey guys after opinions

How low can you go, before causing problems?

FJ 40 35's 15 inch rims. 1680 tare
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Post by Shorty40 »

I'd go the other way around. Lower on rock than sand ;)

When I had 35 BFGs on 15x8 sunnies on my 40 series I ran 8-10psi on rock no probs. Never did a bead.

Moved to 38 TSLs and ran 5-6psi no worries. Never did a bead.
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Post by Busiboy »

I did a little thing the other day in my workshop.

I let one tyre down by eye to where I thought it bagged properly.

Got the same thing, got down to about 8-10 psi.

I did drive it onroad with those pressures for a little bit and it felt ok but was just worried about the bead on rocks.

Just wanted to know how low I could go without beadlocks.

Thinking about bigger rubber too :twisted: :armsup:
Just a bit of a cash flow thing :cry:
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Post by GRIMACE »

lower on rocks then sand is my opinion aswell.

I would say 15 on sand should be ok for your 40 but dont be afraid to go down to 10psi, just dont hook it :roll: or try donuts and shit :D

On rocks 8-10psi as Shorty 40 said should be fine.
I am slowly letting my tyres down more and more each trip and so far no worries until i completely loose a bead i gonna keep droppin :D
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Post by RoldIT »

I run some heavy duty Simex tubes.

They aren't bead locks but stop the "momentary" escape of air that generally cause the tyre to deflate enough to come away from the bead.

Does the job for me ...
KRiS
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Post by stool »

I run my 35" MTR`s on about 13psi on rocks no probs yet on my patrol

Going to try 10psi soon
GQ with big nuts
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Post by roc box »

i run 8 psi in mine admittadly its a light car but my brother in law runs simex extreme trekker2 on his long wheelbase maverick at ten psi no bead locks hasnt rolled one off yet [there 36x12.5]
84 model hardtop, 86in wb, 36 iroks, locked front and rear, lux diffs, exo, power steer, fuel injected 4k corolla 1.3,auto transmission ,2in wheel spacers,3/4 elliptic rear
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Post by RB zook »

i run 6 psi on rok and sand :D

works well



get serious and let some air out
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Post by hottiemonster »

i have run 7-8 psi no problems on GQ SWB :cool: rocks, sand, mud, bitumen road, everything, generally run between 12-15
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Post by MY45 »

8-10 off road ;)
----HillBilly Engineering----
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Post by mickyd555 »

is that cold or hot?
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Post by nicbeer »

Whats the general rule by doing it by eye. I have heard, let it down till the bulge is about 1" out from the tyre?

is this correct.

Zook with 31's on 7's.

cheers
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Post by Shorty40 »

nicbeer wrote:Whats the general rule by doing it by eye. I have heard, let it down till the bulge is about 1" out from the tyre?

is this correct.

Zook with 31's on 7's.

cheers


I wouldn't put my 'bulge' that close to the tyre :lol:
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Post by redzook »

nicbeer wrote:Whats the general rule by doing it by eye. I have heard, let it down till the bulge is about 1" out from the tyre?

is this correct.

Zook with 31's on 7's.

cheers


just try 6-8
its what i nomally run for everthing
even the road if i am to lazy to air up :lol:
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Post by Nev62 »

redzook wrote:
nicbeer wrote:Whats the general rule by doing it by eye. I have heard, let it down till the bulge is about 1" out from the tyre?

is this correct.

Zook with 31's on 7's.

cheers


just try 6-8
its what i nomally run for everthing
even the road if i am to lazy to air up :lol:


Just noticed your location. If I lived 30 seconds from Stockton I wouldnt bother pumping mine up either :lol:
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Post by ToyTruck »

i run 10 psi on sand but i have lowered them to 4psi for sand dune hill challenge and for recovering a pathfinder that was bogged in some wind swept dunes

and 15 to 20 for rocks only so i can turn sharper on rocks

35 BFG mud terrains on 15 x 10 inch outlaws
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Post by HeathGQ »

i popped one of my TSL's at 12psi......
Heath & Melissa - 93 GQ LWB.
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Post by Busiboy »

Tell me more HeathGQ?

Were you bouncing on rock? sand? Stressing the tyre or just driving along?
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Post by Wooders »

If you haven't popped a bead (without beadlocks) you're running too much air :finger:
Run the Heep muddies (non beadlcoked) at about 8-10PSI. Result:
Image

Any excuse for airtools huh :armsup:
Image

The swampers (36") I generally run at about 8 PSI - even though the beadlocks let me go heaps lower I like a bit more diff clearance.....
Cheers [url=http://www.wooders.com.au]Wooders[/url]
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Post by HeathGQ »

Busiboy wrote:Tell me more HeathGQ?

Were you bouncing on rock? sand? Stressing the tyre or just driving along?
wet rocks, slight up and cross fall, wrong line, slide sideways. no bouncing, just sliding, nice and easy.... SO the tyre had horizontal stress. the pressue may have dropped from when i let them down though. only on 8" rims too.
Heath & Melissa - 93 GQ LWB.
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