Losing my fillings...

[Langtoftlad]

My Aclass 4t with Continental 4 seasons, front 52psi rear 69psi (Mercedes rear wheel drive) as recommended by continental

How many axles?

 

[chenderson1965]

Looks like the load rating is 116 - so the spreadsheet is accurate.
Can be tweaked if you get actual weights.

Cheers. I’m pretty certain we’re well under maximum payload and curious to understand the sensitivity to actual load. Could I possibly ask you rerun the numbers with 10% less on each - so 1800 front and 1350 rear?

Thanks. Chris

 

[Reallyretired]

How many axles?

Just the two

 

[Langtoftlad]

Cheers. I’m pretty certain we’re well under maximum payload and curious to understand the sensitivity to actual load. Could I possibly ask you rerun the numbers with 10% less on each - so 1800 front and 1350 rear?

Thanks. Chris

I'm by no means 'technically minded' but as well as maximum pressures, there must be a lower minimum

Just the two

OP has 3 - so the rear wheel drive & the extra axle might make all the difference ?

 

[chenderson1965]

View attachment 423736

I'm by no means 'technically minded' but as well as maximum pressures, there must be a lower minimum

OP has 3 - so the rear wheel drive & the extra axle might make all the difference ?

Thanks a lot.

Wow! 22 on the rears!! Don’t fancy going that low...

Sounds like I could go to 60 on the fronts and 50 on the rears reasonably comfortably. . I’ll try 65 and 55 initially and see how that goes - with another 5 psi in each in hand if I feel I need it.

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[Happy Jim]

22 on the rear isn’t as mental as it sounds for a twin axle at that weight. My kit car runs 20 PSI and has 500kg per axle - freaked me out originally but lots of nerdy temp checking of tyres says it’s about right.

Obviously the safest approach is to just drop 5psi at a time from where you are now and stop dropping pressure if you’re not comfortable doing it.

Rgds
Jim

 

[Bonkers the Dog]

Do what I have done recently, grow a "covid arse". It's broad, flat and padded, soaks up all but the heaviest potholes and I am still working on it!

I have a tri-axle Pilote, running weight about 5000kg. I run all my Michelins at or near 70 pissies. I find it a good ride generally, and a happy compromise between ride, noise, comfort, wear and fuel economy.

It really is a trial and error process but don't get too bogged down over it as the state of our God awful roads is the main culprit...

 

[funflair]

Our Rienza runs on Continentals. 65 psi rear, 55 psi front. It is a firm ride but not unbearable and it handles well for its size.
Whilst training on a Renault recovery vehicle my instructor said I am glad it’s a Renault not an Iveco. You need to invest in chewing gum to keep you’re teeth apart on the Iveco. The Renault had air suspension not leaf springs as per the Iveco.

I believe that all the IVECO daily chassis for motorhomes are a minimum of leaf springs rear and torsion bars on the front, most also offer the option of air suspension either just on the rear or front and rear with a further addition of active damping, the IVECO daily chassis is now the "go to" for virtually all motorhomes between 6000kg and 7495kg and to be fair the ride is very good.

And as we are talking tyre pressures etc the maximum front axle loading with 121 rated Continentals is 2900kg at 84psi.