Quote: Originally posted by marg6 on 19/8/2025
what does it state on the tyre? single axle would be around 60psi, twin would be around 35 psi, but always go by what it has on the tyre
Be careful with that thought!
The pressures shown on the sidewalls are normally the MAXIMUM pressure, not necessarily the recommended pressures!
As well is two words!
How does a sage know everything about everything? or does he? or does he just think he does?
Remember, if you buy something you bought it, not brought it.
MTPLM stands for Maximum Technically Permissible Laden Mass, which is the heaviest weight a caravan or trailer can be when fully loaded and on the road, including its own weight, all contents, and passengers.
Mrs B, no doubt hubby is making comparisons with car tyre pressures.
Well, they are arrived at by the same principles of pressure is relative to the load carried by them, a caravan has a similar weight to a car, BUT all that weight is carried on just two wheels (for a single axle van anyway), so the pressure needs to be higher than a car where the similar load is spread across four wheels.
My quite lightweight 1310Kg MTPLM Lunar van still runs on 59PSI tyre pressure!
The pressure markings on a tyre sidewall are purely the MAX safe set (when cold) pressure for the tyre, they do not reflect the correct running pressure for any particular vehicle, the same tyres could be fitted to a variety of vehicles of significantly different weights, they are not unique to a specific vehicle so the markings cannot be universal operating pressures as some erroneously suggest. The CORRECT pressure is what the caravan manufacturer stipulates, and has calculated for the load carried by the tyres.
A great many caravans are pushing their specified tyres to their safe/working limits on load, and consequently the pressures match! It's a good reason for checking tyres regularly and not abusing the replacement age recommendations. Those that dismiss them as "only caravan tyres - they don't go very fast" when buying and maintaining, are missing the very critical point of safety under heavy load, often near the tyre's limits!
If hubby is concerned about the static pressure, he better not see what happens when the van is on the road! I've got Tyrepal pressure/temp monitors fitted to my van wheels, my static/cold pressure of 59PSI rises by up to 8 or 9PSI (making it 67/68PSI) once the van has been rolling for only a mile or two! That's down to the rise in temperature due to the heat generated by flexing of the rubber when rolling. All perfectly normal, all perfectly safe (The MAX pressure - often 65PSI - marked on the tyre sidewall, is the max set pressure when COLD, allowance is made for it to rise above that in use, and it does NOT need adjusting to keep below marked pressure as some are inclined to believe.)
Monty (as always) is right, I always keep an eye on my TyrePal and have now got used to seeing the pressures showing around 75psi when I'm driving, even had to change the threshold by 3psi for the alarm going off on a trip back from France a few years ago 😂
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.
Topic: Coachman 575 Tyre pressure?
via mobile 19/8/2025 at 11:00am
