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Old 15-06-17, 09:05 PM   #1
dieselfumes
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Default Tyre Pressures

out of interest, i have a indespension plant trailer with a couple of tons of engine on, what pressure do you guys run in the tyres? it says max 65 this sounds a bit high to me? there only 13" they are 8 ply i suppose but even so...........
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Old 15-06-17, 09:21 PM   #2
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The tyre MAXIMUM RATING is given at the psi on the sidewall.

We have dual axle and 3-axle trailers with 1300kg per axle rating, they use 175R13C commercial tyres. The new trailer has 1500kg axle rating with the same tyres, we usually run them at 50psi.

These tyres are rated at 730kg per wheel, so the 6-wheel 3500kg trailer is well covered at 4380kg, the four-wheel close-coupled 2600kg trailer is well covered at 2920kg, the new 4-wheel trailer is slightly down on its 3000kg rating with 2920kg, so we may adjust the tyre rating to cope. In all cases we aim to run the tyres at less than their maximum.

Peter
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Old 15-06-17, 09:24 PM   #3
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my Ifor Williams trailer is rated at 2000kg's I run my tyres at 65psi as stated by the tyre wall.

Martin P
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Old 15-06-17, 09:30 PM   #4
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I'd go to a tyre centre and ask them, it seems high to me. I run 48psi on the caravan and 42psi on the home made trailer (10" mini wheels)
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Old 15-06-17, 10:00 PM   #5
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On my trailer there is a sticker listing all of the tyre types available for it and showing the operating pressures, my tyre is listed as 65 psi so that's why I use that pressure.

Martin P
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Old 15-06-17, 10:08 PM   #6
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Quote:
Originally Posted by Lister M View Post
On my trailer there is a sticker listing all of the tyre types available for it and showing the operating pressures, my tyre is listed as 65 psi so that's why I use that pressure.

Martin P
Agree with that.
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Old 15-06-17, 10:15 PM   #7
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Old Indespension tyre pressure chart, check if yours is listed?.
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File Type: jpg Trailer Pressures.jpg (67.2 KB, 21 views)
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Old 16-06-17, 01:23 PM   #8
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My Blueline 2600kg trailer is fitted with 4 165x13 tyres, rated at 65psi at 710kg per tyre - 2840kg total; 10% headroom above the trailer rating. The max pressure (65psi) is rated at the max load (710kg) - Blueline recommend 55psi for this trailer.

It shouldn't be forgotten that tyres get warm and the pressure increases whilst running. Running a tyre at the maximum stated pressure feels a bit like driving your car with the tacho at the red line - it's safe; that's why the manufacturer put the red line there, but unnecessary.

Having said that, I can completely understand why Ifor would have gone for the max pressure - most IW trailers will spend their life overloaded, and most IW trailers will never have their tyre pressures checked! (Farmers!)

MP
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Old 16-06-17, 07:39 PM   #9
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Quote:
Originally Posted by martinpaff View Post
It shouldn't be forgotten that tyres get warm and the pressure increases whilst running. Running a tyre at the maximum stated pressure feels a bit like driving your car with the tacho at the red line - it's safe; that's why the manufacturer put the red line there, but unnecessary.
MP
I've never taken anything to the red line so no problem there and in all the years I've had the IW trailer its only had two sets of tyres and not because they were worn out but because they had started to crack through age.

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Old 16-06-17, 08:21 PM   #10
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My twin axle caravan has commercial tyres that are marked as 54psi. However the caravan plate says 36psi. I suspect it's to give a little suspension.

So I wouldn't take the max on the tyre as the recommended pressure.
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