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Interesting figures Bertie?

new van,1300kg and 58psi

old one 1180kg and 53psi

Both S/A on 175x13 8ply tyres, 1460 max between them at 65psi

hi can some 1 tell me wot psi  should be in mine twin axle mtplm 1700 tyre 155/80/13

Quote: Originally posted by wizzo1968 on 26/4/2007

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hi can some 1 tell me wot psi  should be in mine twin axle mtplm 1700 tyre 155/80/13

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Hi gary they or all the same firestorm 155/80r13 79t max load 437 kgs (965lbs)

max infl.press 300kpa (44psi

Well the answer would be 43psi but I've not got a tyre listed of that size rated at 44psi?, the 79 load index = 437kg so that's right but at 35psi in my book!. I've no idea why that should be?

That aside for a moment, what it also shows is your tyres are working at their maximum, for caravan use the tyre manufactures recommend you don't get closer than 90% of the stated maximum.

So whatever tyres you have then their only recommended for a safe maximum mtplm of 1590kg between the four of them rather than the stated 1748kg. You would therefore be better with the same size tyre as either a 'Reinforced'  or 'Commercial' grade 6ply or if possible move up to 165/80x13. At 90% the reinforced carries 1750kg so just nicely in, the 6ply though is a little better still at 1850kg and the standard type 165/80x13 1753kg