Like my car, my van runs 265/75 R16 tyres, and when I replace the car's tyres I transfer the tyres that are on the car to the van to run them out. Tyres max load is 1550kg, max pressure is 80psi. Since I've been on the road I've been playing around with several different brands, looking for one that best suits.
Today I negotiated a very good price on 4 Toyo Open Country tyres, so first the dealer swapped the car's wheels (Maxxis . Poor) onto the van, as I had asked, but I then noticed that he was putting air into all 4 tyres.
When I asked about this he insisted that anything under 60psi was totally unsuitable, and he got quite toey when I told him "40 psi".
The van is dual axle and I run 3150kg GTM (weight on wheels) so put 40-42psi in tyres. This pressure is lowered on rough dirt roads, but there is no way that I was going to allow the dealer to put 60psi in my tyres, as he had suggested.
My concern is that he may be offering this incorrect advice to others who have no understanding of tyre pressures. Cheers
-- Edited by yobarr on Thursday 21st of September 2023 06:57:44 PM
I don't tow, so car only. 255/60r18 x 6 (2 spares).
When I got new All Terrain tyres. They pumped them up to 45psi. I said that is far too high. Reply was, 'everyone pumps them up that much'.
After some arguing, they were going to reduce the pressure. I said I will do it myself.
They really must have been totally blind to my air management set up, so obviously I don't take air seriously! as two wheels had to go in the boot, which they had to take out at the start of the job.
Dropped back to 32psi as car states when home, after bone jarring ride.
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A few months ago, I found the calculations for correct tyre pressure based on the actual wheel load, and the maximum allowable load at its maximum tyre pressure from the tyre's sidewall.
I recently purchased some Toyo Open Country tyres for my vehicle and after collecting the car, I checked the pressures and noticed that the pressures were a few psi higher than I ran the old tyres. But doing the tyre pressure calculations, even though the new tyres had a higher max load rating, that rating was a higher max allowable pressure. Based on vehicle wheel loads, it seemed that the tyre fitters pressures were about right. By coincidence, I suspect.
Also, simllarly I checked the van's recommended tyre pressures on its tyre placard, as compared to the tyre pressure calculations. Guess what, if I take account of the extra 20% factor for the van's independent suspension system that is fitted, the tyre placard pressures matched my calculations.
I use Cooper AT3 tyres on the BT50 which I run at 40psi when on sealed roads. I think the pressures must be about right because the pair on the front have done 108,000km so far (they were on the rear until 6 mths ago). Approx 5% of that towing.
I could probably legally get about another 10-15k km out of them, but I will replace very soon as with any tyre the grip decreases a lot when there's only a few mm left.
Rod
