Tyre pressures too low

[herald_400rl]

Hi all,

Tyres looked a little flatter than usual so it's time to check the pressures. The handbook/manual (some 23 years old) has written in pen 55psi front/rear. I'm not sure if this is manufacturer or Bob decided that was best in 2011. Does anyone know where I'd even look to confirm this?

Thanks

 

[David and Sally]

Sometimes there is that info on a door pillar. Do you have a manual?
There is a website - I will try to find a link - that you input the weights and tyre details to get the right pressures to use.

Motorhome Tyre Pressure Calculator | TyreSafe

Our motorhome tyre pressure calculator gives you the correct pressures for your motorhome. Check your tyres regularly for your safety.

www.tyresafe.org

 

[herald_400rl]

Sometimes there is that info on a door pillar. Do you have a manual?
There is a website - I will try to find a link - that you input the weights and tyre details to get the right pressures to use.

Thanks, nothing on the door pillars or "usual" car places, the manual I'm not sure is the original but rather a replacement copy and tbe values written in the front. I can go with them for now, but normally I see people throwing 70+psi around.

 

[David and Sally]

Thanks, nothing on the door pillars or "usual" car places, the manual I'm not sure is the original but rather a replacement copy and tbe values written in the front. I can go with them for now, but normally I see people throwing 70+psi around.

See #2

 

[Otter Spotter]

Hi all,

Tyres looked a little flatter than usual so it's time to check the pressures. The handbook/manual (some 23 years old) has written in pen 55psi front/rear. I'm not sure if this is manufacturer or Bob decided that was best in 2011. Does anyone know where I'd even look to confirm this?

Thanks

Check the tyre manufacturer if you tell them the axle weights they should be able to confirm the correct pressures.

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[Badknee]

55psi front and 65psi rears for me. Tried the 70+ and 80+ and the ride was terrible, nearly rattled my fillings out on anything less than snooker table smooth.

 

[Tigger-Tim]

The best way is to go to a weighbridge in normal touring trim. Get front and rear axle weights.

Then contact the tyre manufacturer for their recommendation.

 

[Langtoftlad]

Bridgestone advised 53psi all round based on actual axle weights

 

[Jo May]

Sometimes there is that info on a door pillar. Do you have a manual?
There is a website - I will try to find a link - that you input the weights and tyre details to get the right pressures to use.

Motorhome Tyre Pressure Calculator | TyreSafe

Our motorhome tyre pressure calculator gives you the correct pressures for your motorhome. Check your tyres regularly for your safety.

www.tyresafe.org

That calculator comes up with different results to the ones I worked out after contacting my specific manufacturer (Continental).
The front pressures were similar, my calcs gave me 47 PSI, as did TyreSafe, near enough.
But the rear were way different. Again, my Continental result gave me 47 psi but according to Tyresafe my rears should be 80 (which is not only 33 psi over what I have in but also 11 over my stated maximum as stamped on the tyre wall).
I wonder if the discrepancy is because mine is PVC (CV 20) and not a Motorhome. On the Tyresafe site there isn't a PVC option. Still, it seems a hell of a difference.

 

[BouncyBoatFolk]

That calculator comes up with different results to the ones I worked out after contacting my specific manufacturer (Continental).
The front pressures were similar, my calcs gave me 47 PSI, as did TyreSafe, near enough.
But the rear were way different. Again, my Continental result gave me 47 psi but according to Tyresafe my rears should be 80 (which is not only 33 psi over what I have in but also 11 over my stated maximum as stamped on the tyre wall).
I wonder if the discrepancy is because mine is PVC (CV 20) and not a Motorhome. On the Tyresafe site there isn't a PVC option. Still, it seems a hell of a difference.

Do your rims have the high pressure valves fitted, [ all metal construction?].
From what I've read on this forum,the tyre pressures stamping limit is for the American market, but worth checking with Continental.
Mike.

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[Otter Spotter]

That calculator comes up with different results to the ones I worked out after contacting my specific manufacturer (Continental).
The front pressures were similar, my calcs gave me 47 PSI, as did TyreSafe, near enough.
But the rear were way different. Again, my Continental result gave me 47 psi but according to Tyresafe my rears should be 80 (which is not only 33 psi over what I have in but also 11 over my stated maximum as stamped on the tyre wall).
I wonder if the discrepancy is because mine is PVC (CV 20) and not a Motorhome. On the Tyresafe site there isn't a PVC option. Still, it seems a hell of a difference.

I have Continental tyres and they told me to ignore Tyresafe it’s not accurate enough and may not have the up to date tyre specs. So go with Continental

 

[gus-lopez]

Give us a clue what size the tyres are?

 

[gus-lopez]

https://www.wheel-size.com/size/ford/transit/1999/


50 psi is what I used in a similar coachbuilt.

 

[rupert]

I check the wear across the tyre tread after a couple 000 miles if its more worn in the middle decrease pressure. if more wear on outer edge increase pressure. if worn on one edge only get it tracked

 

[Jo May]

Give us a clue what size the tyres are?

Who Me? 225/75 R16 CP
Attached is the table I was sent by Continental.......

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[herald_400rl]

Give us a clue what size the tyres are?

I'll have a gander when I get home. From the link you posted ours is on a 190 LWB chassis, 114 Bhp.

 

[herald_400rl]

So tyres are 225/70/15 and axle weights are 1600 front 2200 rear which gives 51/80 on the calculator.
I'll try for 51/70 and see how it goes.

 

[Hettie's Crew]

https://blobs.continental-tires.com/www8/servlet/blob/85806/71c96d7b7f5265e7fdacae088b19f8e6/download-technical-databook-data.pdf

 

[Speve]

The best way is to go to a weighbridge in normal touring trim. Get front and rear axle weights.

Then contact the tyre manufacturer for their recommendation.

And Michelin will always tell you 70psi

 

[cyberyacht]

I think you mean 80psi.

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[Deep Owl]

4 bar/ 56psi front, 4.5/ 64 rear for my Maxxis Vansmarts, and I’m happy with the ride and road holding.

 

[Tigger-Tim]

And Michelin will always tell you 70psi

Maybe not for a Herald 400RL (which is what the OP says they have).

 

[Speve]

I think you mean 80psi.

Yes you are right I was thinking of what I put in instead and they are still to hard a ride without much on board but with a loaded car trailer on the back it’s reasonable

 

[SSILVO]

Hi all,

Tyres looked a little flatter than usual so it's time to check the pressures. The handbook/manual (some 23 years old) has written in pen 55psi front/rear. I'm not sure if this is manufacturer or Bob decided that was best in 2011. Does anyone know where I'd even look to confirm this?

Thanks

So many variables what make, what size what sp rating ..if they are continentals there is a free tyre manual with off there site with all pressures vs axel weights and sp rating ..for example Michelin aglis ,Michelin recommend 80psi all around which rattles your fillings ,I changed to continental all season vanco 2s with a rating of sp 119/121 and the recommended pressure is 51psi front and 61 rear..on a 4 ton rating which has made so much difference.

 

[headlight]

My recommended pressures are 80psi front and back according to the sticker on the door pillar.
The ride was terrible.
I reduced the pressures to 70psi rear and 65psi front then 65psi rear and 60psi front which made the ride much much better.
I went on the mentioned tyre pressure calculator after doing that and it recommended 60psi rear and 55psi front.
I've left them at 65psi rear and 60psi front as I'm happy with the ride

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[bobnick]

I go off the tyre pressure warning light, if it comes on i put air in after checking with a manual gauge which is the lowest, it's worked me in the past, the light goes off (sometimes you have to re set the light).

 

[L' Hobo]

55psi front and 65psi rears for me. Tried the 70+ and 80+ and the ride was terrible, nearly rattled my fillings out on anything less than snooker table smooth.

I do 60 all round, it's easier to remember!

As you say, tried higher but too hard IMO.
now been using 60 for 5yrs+ and, in my professional opinion, tyre wear is correct on my 3500kg Murvi Morello.

 

[GerTee]

https://blobs.continental-tires.com/www8/servlet/blob/85806/71c96d7b7f5265e7fdacae088b19f8e6/download-technical-databook-data.pdf

Thanks for that. We've got the Conti 4 Seasons and have always felt the ride was a bit lumpy. According to this I can drop the rear from 75 to 65psi and the front from 72 to 58psi. Will see how it affects the ride and keep an eye on the tyre wear patterns.

 

[Hettie's Crew]

Thanks for that. We've got the Conti 4 Seasons and have always felt the ride was a bit lumpy. According to this I can drop the rear from 75 to 65psi and the front from 72 to 58psi. Will see how it affects the ride and keep an eye on the tyre wear patterns.

We’ve also got the 4 Season’s, recommended by Continental over their own CP tyre for ours in 225/70 15.

 

[georgio]

If you look on the side of the tyre it will tell you ther max pressure, then work down a bit.