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Tyre pressures for road use



I've just had to replace two tyres on my truck. It's running Dunlop Grand Treks and has the "wide" tyres (is it 275/55 R16? Can't remember off-hand).
Anyway, I've had over 40,000 miles out of them, so no complaints there, but looking at the wear they are worse at the edges than at the centre. Therefore it seems to me that they should be running at a higher pressure than the handbook's 32 psi regardless of load.
Does anyone have any views about this?
Christopher Bell
Devon, UK
1996 1HD-FT
Those tires are the default factory ones on teh Patrol GR here in
Portugal... Big piece of crap... Yeah they are very confrotable and good
only on dry tarmac - only!... Anyay the Patrol I had had same problem those
tires... Regard that sometime it "looks" that its wear on edges but is
normal. Anyawy try 35psi. Be aware that the pressure it counts is on HOT.
Ex: you put 32psi but after 30min ride this pressure is 36 now.
Since I used non standard measures of tires I kind of "developed" a
techinque to mett my tire pressure. I fill with 36 or 38 psi all tires, the
after roading with them or after come from work I measure (usualy get 40 -
42psi) and extract (only extract) the excess of air until I get 36psi (or
other you want), remember never to add air because the diferent air temps.
This give you the correct 4 well air pressure of roanding. Next day , when
cold, if you want you can check in cold to see the pressure you have.
In my case I regarded that the tire where I sit is as allways a bit more
pressure on cold, but when hot I have all 4 equal.
305/70/16 GoodYear MTR, 35Psi on cold, 37 on hot. Hot after running at
minimum 30min
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If it's taken 40,000 miles to wear noticeably more on the edges they can
only be very slightly under pressure or maybe another cause, tracking a
fraction out or something like that? At 40,000 miles is it worth
worrying about it?
Best Regards,
Hi Christopher,
If you are talking about the fronts it is quite common for the outer
edge to wear quicker than the inner edge or centre, but this is more
down to the steering geometry.
I was following a thread on this the other day, and some were
suggesting periodically getting the tyres swapped around on the rims
(as long as you don't have a unidirectional pattern) to try to even the
wear/prolong life.
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
1994 HDJ80, 2.5" OME Lift, ARB
Toyota have spent fortunes testing and measuring etc. so if they recommend
32 psi I'd stick to that and look for other causes for your tyre wear.
As Julian asks are we talking about front tyres?If so it is not unusual for
edges to wear.
I am now on my third 80 and can remember the 80's list people used to talk
of running 40 or more psi.I have always used 32psi with no problems.
If you are towing a lot or have extra weight in the back then increase by 2
psi but remember if you go too high you could skid as too much air makes for
poor grip.
Also worth remembering that if your vehicle is ever involved in fatal
accident the police may impound your vehicle and check it over,especially
tyre pressures!!
I also agree with these tyres being pants, but 40k is good going.
Mine currently has some cheap and nasty(noisy) tyres and they have very
weird wear patterns and handling characteristics, like feathering on the
rear tyres.
Its never been in an accident and drives perfectly straight but does get
sucked in by the road camber.These also are wearing at the front edges but
having checked everything I am happy its the tyres at fault.
Dave Harris
[Email address removed]
97 VX 1HDFT Devon UK
----- Original Message -----
From: "Christopher Bell" <[Email address removed]>
To: <[Email address removed]>; "elco" <[Email address removed]>
Sent: Wednesday, September 29, 2004 10:36 AM
Subject: [ELCO] Tyre pressures for road use
Thanks everyone for the input.
The tyres have been on the back for the last 25k miles, and I do a fair bit of towing, so I think adding maybe 2psi would be in order. The wear was absolutely even side to side, so no tracking issues. I had the fronts re-balanced too, and the ride is now far smoother.
I'm very happy with the Dunlops since I spend 99.99% of my time on road - heresy, sorry! They are not too noisy, but I'm beginning to think that some sound-proofing material under the rear carpet might not be a bad idea.
MOT time for me next month too...
Christopher Bell
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