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 Topic: Tyre Pressure (yes I know...)!
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21/7/2021 at 3:30pm
Location: Wigan
Outfit: VWSharan. Sport 442.
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Sorry, but I would change the tyres: all three, but it is your decision.
Your present tyres, if rated at 98, (or 750 Kgs/tyre), are at the maximum load, hence the high tyre pressure, with no extra safety.
Your van has an MTPLM of 1,550 Kgs, and it is advisable to add 10% as a safety factor, so that brings it to 1,705 Kgs. Divide by 2 gives a load per tye of 852.5 kgs/tyre.
I would go with a minimum loading of 102 i.e. 850 Kgs per tyre.
This would reduce the tyre pressure to 59.26 psi, but it is your choice.
Post last edited on 21/07/2021 15:49:01
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21/7/2021 at 4:21pm
Location: London
Outfit: Lunar Cosmos 524
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There is another factor which the OP's original calculations overlook, which is weight distribution across the axle! My van, as I'm sure is common to many vans is inherently heavier one side than the other (no doubt due to kitchen, shower and door all being on same side), by 10's of Kgs, so the total weight distribution is NOT a simple 50:50 split! That would likely push one tyre to being overloaded, rather than just up to it's limit!
The thought of a tyre both up to it's weight and pressure limit is not a comfortable one for me! I certainly wouldn't be running it under recommended pressure as the extra heat generated by sidewall flexing would encourage failure more than the high pressure would. I'd also diligently replace them regularly, probably more frequently than the industry recommended every 5 years.
The suggestion of going for a higher load rating may not be an option, a quick check (a more thorough check may prove more fruitful) suggests that the highest load rating on offer for that tyre size is 99 (775Kg)!
All things considered, I think I'd personally only be happy towing a near empty van close to it's MIRO, rather than it's MTPLM, unless I could find higher load rated tyres.
I've little doubt, the bureaucratic needs would be satisfied by the 99 load rating and 65psi, but I just don't like pushing safety to the limits.
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via mobile 21/7/2021 at 3:08pm
