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Tyre press ? - horses for courses... Pressure Database

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  • #61
    2008 GXL D4D
    Brand:Bridgestone 265/65R17 D697 LT
    Lifted: Yes
    Road:45 PSi
    Beach:20PSI or Lower if soft
    Gravel:25-30 psi
    Mud:Never been in Mud
    I replaced the Grand Craps in March with these . Tyre fitter put 65PSI in them . It says that on the tyre wall . I have been trying different pressures 40 psi bounces up and down like a trampoline . Trying 45 at the moment but may go to Fifty.

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    • #62
      2P's, generally speaking the higher you go with the pressures the more it'll bounce. If you were bouncing around like on a trampoline in 40psi it'll be even worse with 45psi! Tyre pressures are all in relation to the load that you are carrying, the more loaded you are the more pressure should be in it. All tyres are rated to a maximum load at the rated maximum pressure stipulated on the sidewall. Try something like 34 psi as a starting point and keep going up from there in increments.

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      • #63
        Thanks Sunny but I tried starting lower and it was worse . have them at 50 at the moment and they are better . I am beginning to suspect the shocks so will get in touch with my aftermarket supplier .

        Will let you know the outcome.

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        • #64
          If the tyres are bouncing up and down, then the shock aren't doing their job in slowing down the speed. Putting higher pressures won't help. It will make it bounce more. The tyre fitter puts in 65psi to seat the bead. After that, it should be lowered to around 42psi. The only time you would go more on bitumen is if you are towing and have extra weight on the towball.
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          • #65
            Originally posted by amts View Post
            If the tyres are bouncing up and down, then the shock aren't doing their job in slowing down the speed. Putting higher pressures won't help. It will make it bounce more. The tyre fitter puts in 65psi to seat the bead. After that, it should be lowered to around 42psi. The only time you would go more on bitumen is if you are towing and have extra weight on the towball.
            ^ tats about right


            Try 36psi & new suspension, sounds like your dangerous atm

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            • #66
              Thanks for all the advice . Most Welcome - It was the front shocks. Got em replaced under warranty and all good . Running now at 34 and absolutely fantastic

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              • #67
                Bump.

                A tyre is is like a spring in a way. Higher pressures is like a heavier spring loaded.. spring.

                2006 GXL V6
                Brand: currently running Sonny SU-800's. On the car before we bought it in 2011
                Lifted: nope. Stock
                Road: currently at 38psi
                Beach: never been on it... Yet
                Gravel: haven't done much of it that needed to lower pressures
                Mud: same as above

                Soon going to change to Bridgestone D697's since they're the best value and have so many good things said about them.
                [B]CANYONEROOOOO *whipping in the distance*
                [URL="http://youtu.be/7ZeFDe44Ddo"]
                http://youtu.be/7ZeFDe44Ddo[/URL]

                Toyota LandCruiser Prado GXL V6 [COLOR=#800000]Red[/COLOR][/B] (APRIL 2006 BUILD)

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                • #68
                  Originally posted by Hughda View Post
                  Somewhere else on Pradopoint is what I recall as being the Pirelli rule. If your tyres are at the right pressures cold, then they will increase by 4psi when hot. If they increase by more they were too low to start, and if they increase by less they were too high to start. Basically, this seems to work for me. It applies to black-top rather than gravel & sand.
                  Hughda
                  I also used this rule before i had the higher load rated BFG A/T's. On our resent WA trip across the Kimberly ran 20-25 on gravel. Pressures would increase by 7-10 psi and temperatures would also increase. We also run TPMS, temp and press. The sidewalls are so thick that we had to drop a lot lower than we did with the lower rated BFG A/T to maintain ride quality and control. Where we would use 25 psi we now use 22 psi. All tyres will behave differently on gravel and what shocks you have will be another variant.
                  Even when blacktop running, starting at 40 the tyres would increase to 46. So started running 36 and increase to 42. Same temperature as well. Around town we use 34 psi and after doing many tests with higher and lower pressures no difference in fuel usage. Just more comfort and better control in the wet.

                  Rusty.
                  08 VX D4D, Lift, Safari Snorkle, Trailblazer Fridge, Custom Storeage System, BFG, ARB Safari Bar, Wife, Kids, Codan NGT HF Radio, Debt.
                  06 100 Series Sahara, Bilteins, Kings, Beaudesert 3", Diff drop, Unichip Q4, Safari Intercooler, EGR delete, 20ft Bushtracker, Codan Envoy more coming.
                  Sometimes i wake up Grumpy, most times i leave her sleep.

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                  • #69
                    Just back from a 9000km trip circling the Simpson from Brisbane, and I'm at a loss with tyre pressures. Of the 3 vehicles, I was the only one to puncture a tyre (4!) but I was the only one who reduced the pressure on rocky/corrugated tracks.

                    We were all fully loaded and towing Kimberley Kampers (approx 200kg ball weight).
                    On dirt, I would reduce my Bridgstone 697s to about 25psi in the front, 27-28 in the rear. Once underway, the rears would increase to about 31/32 psi and 28/29 psi in the front.
                    I had 3 punctures in the rear-right tyre, one in the trailer, and have just noticed another slow leak, right next to where I patched my first puncture, so really 5 all up.
                    The other two (Prado with virtually identical age D697s and LC with brand new BFG KO2's) kept their pressures high (35-50psi) and had no troubles at all.

                    My two rear tyres are cut up to shit, but the front 2 are in fairly good nic.

                    The tyres had about 15-20k on them before the trip, and it looks like I'll need to replace the 2 rears.
                    I suspect the px was too low in the rear. Thoughts?
                    [SIZE=1]2010 150 GXL Ebony Diesel | ARB Delux Bar | ARB Bashplates | GME 3450 UHF | Bilstein/Dobinson lift | SA LED Lighting 185W Spotties | Bridgestone D697LT | Wet Seat covers | LeighW's Voltage booster | Tin75 Pet barrier | 3D Mats'n'boot protector | Onboard ARB CKMA12 Compressor | Rhino Pioneer Platform | Roadsafe Recovery Points | Airtec Snorkel[/SIZE]

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                    • #70
                      Sometimes you can be unlucky. Pic of the rear tyres on my Prado after Kimberly's, Gibb River, Mitchel Plateau, Bungles, Tanami and Sandover Hwy's this year.
                      Trip from home (Brisvegas) return was just over 10,000 km. These tyres now have approx 100,000 on them when this pic was taken.
                      Road 36
                      Gravel 20-25 depending on conditions, the rougher the lower pressures. Did keep speed to 4 x PSI most of the time (20 psi x 4 = 80kph).



                      Trailers and cars (both Prado's) all same tyre 265-70-17 BFG A/T. Mixture of load ratings and no punctures at all. Only tyre failure we had was the spare on brothers trailer fell off on the Tanami Hwy and we didn't see it.

                      Rusty.
                      08 VX D4D, Lift, Safari Snorkle, Trailblazer Fridge, Custom Storeage System, BFG, ARB Safari Bar, Wife, Kids, Codan NGT HF Radio, Debt.
                      06 100 Series Sahara, Bilteins, Kings, Beaudesert 3", Diff drop, Unichip Q4, Safari Intercooler, EGR delete, 20ft Bushtracker, Codan Envoy more coming.
                      Sometimes i wake up Grumpy, most times i leave her sleep.

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                      • #71
                        I am just back from a Windorah, Birdsville, Marree, Lake Eyre then south trip.

                        As I am new at this and still have the Original Dunlop ATs on I asked the locals and got just as many different answers as there are on here

                        At Windorah they said "the only time we let them down is on sand, otherwise Toyotas run on 36-38 all the time"

                        At Birdsville they said " Softer is better" and another said "It depends on the tyres and the vehicle, the main thing is to have a belly in them" after he came and had a look he said "they are about right go at that"

                        So I left Windorah on 37 and found it a bit rough out to Birdsville, doing about 80k mostly, I dropped them to 33 at Birdsville before asking around and when the NPWS bloke reckoned they looked alright to him I went down the track at 33.

                        I did the find the 33 a better ride and less noisy so I think that was a good move, probably stay at that pressure on gravel while I have the Dunlops on as they do bag a bit.

                        The blokes with light truck tyres were down in the 20s, some were 22 and 26 so that is a big difference, they all spoke about getting a baggy look to the tyre but not so much that the sidewalls can get cut.

                        I was also told to check them each morning when cold and if right, then all good for the day ( if the road surface stays the same)
                        Fortunately no punctures at all but I was not towing and not that heavy a load on board
                        Last edited by ozimacca; 12-10-2015, 06:28 PM.

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                        • #72
                          2005 VX V6
                          Brand: 285/70/17 BFG KM2 Muddies
                          Lifted: 2" Fox
                          Road: currently at 38psi
                          Beach: 12psi. Less with secondair bead locker rims
                          Gravel: 28psi
                          Mud: 18-20psi
                          2005 Prado 120 VX 4.0 V6, Fox Performance 2.0 Coilovers/Rear Shocks/King Rear Springs, Blackhawk UCA's, 285/70/17 BFG KM2's on 17x8 TRD Rims (FJ Offset), Safari Snorkel, Drivetech Transmission Cooler, Scangauge II, ARB Winch Bar, ARB UVP Bash Plates, Tigerz11 22" LED Lightbar

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                          • #73
                            2003 Prado GX 3.0 Turbo Diesel
                            Brand: 245/70R17 Goodride SL367 A/T light truck 10 ply
                            Lift: no
                            Road: 40
                            Gravel: 30 - and Tanami Track=Corrugations
                            Mud: not yet

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