Tyre pressures for 15" wheels/tyres?

[vintageb3]

Happy New Year Folks!
Or as I would normally say...Happy Wednesday! Never understood people celebrating the change of a calendar page....and I'm a Scot!

I have a Fiat Ducato based motorhome. (3500Kg) It has 16" Fiat alloys which have running pressures of around 80PSI. I bought a set of 15" steel wheels a few years ago to sit the van on over winter if required...or just to have options. The 15" steel wheels came off a Fiat Ducato campervan. (3500Kg) I'm not near the 15" wheels just now but I remember the tyres load rating was ample for the axle weight of my motorhome. But, I did note the tyre pressures were a max of say 65PSI (from memory) but I note a lot lower than the alloy wheels at around 80PSI.

Can I ask what others with 15" steel wheels run the tyre pressures at?

I do understand that tyre pressures relate to the load being carried by the vehicle, but I'd like a rough guide to what others are running with. Does 65PSI sound low? I need to get my alloys refurbed and wondered if i could use the van with the 15" wheels for short trips over the winter.

Thanks for any advice offered!

 

[Phill D]

First, the 68 psi on the tyre walls is irrelevant for uk, it’s a US standard.

Is 65 psi enough? Depends on the axle loads and the tyre type and manufacturer.

I had 15” on my 2012 Ducato and ran at that sort of pressure s but k had Toyo observe tyres fitted.

Ps: conti tyres and Michelin camper tyres at 15” were often recommended to run at 80 psi on the rear

 

[LesW]

We have an Autosleeper Inca with a 3500kg weight 'listing', after 'experimenting' I run with 55psi front, 65psi rear, (it's fitted with Falken van tyres).

 

[vintageb3]

First, the 68 psi on the tyre walls is irrelevant for uk, it’s a US standard.

Is 65 psi enough? Depends on the axle loads and the tyre type and manufacturer.

I had 15” on my 2012 Ducato and ran at that sort of pressure s but k had Toyo observe tyres fitted.

Ps: conti tyres and Michelin camper tyres at 15” were often recommended to run at 80 psi on the rear

Thats great advice Phill! Thanks for taking the time to reply!

 

[L' Hobo]

First, the 68 psi on the tyre walls is irrelevant for uk, it’s a US standard.

Is 65 psi enough? Depends on the axle loads and the tyre type and manufacturer.

I had 15” on my 2012 Ducato and ran at that sort of pressure s but k had Toyo observe tyres fitted.

Ps: conti tyres and Michelin camper tyres at 15” were often recommended to run at 80 psi on the rear

IMO that's far too high for a PVC.

I have a MURVI 3500kg and run my 15" tyres at 60psi all round.

After reading on the forum a few years ago how some Funster pressured tyres to the range you are advising, I tried it and found it far too high and could feel every small bump in the road that nearly shook my fillings out.

High pressures might be right for Coach-built, I've never owned one, but for PVC's I would advise against it?

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[Phill D]

IMO that's far too high for a PVC.

I have a MURVI 3500kg and run my 15" tyres at 60psi all round.

After reading on the forum a few years ago how some Funster pressured tyres to the range you are advising, I tried it and found it far too high and could feel every small bump in the road that nearly shook my fillings out.

High pressures might be right for Coach-built, I've never owned one, but for PVC's I would advise against it?

The correct answer is it depends on tyre size and load rating and the actual axle weight on a weigh bridge.

The type of motorhome wether coach build or pvc is irrelevant.

Give the above information to the tyre manufacturer customer service who will give you the correct running pressures.

 

[vintageb3]

We have an Autosleeper Inca with a 3500kg weight 'listing', after 'experimenting' I run with 55psi front, 65psi rear, (it's fitted with Falken van tyres).

Thanks Les! Two of these tyres are Falken van tyres, the other two are budget van tyres. That gives me something to work from. I have a TMPS system so i will stick those on these tyres and watch for any issues running near those pressures whilst I do a test drive.

 

[vintageb3]

The correct answer is it depends on tyre size and load rating and the actual axle weight on a weigh bridge.

The type of motorhome wether coach build or pvc is irrelevant.

Give the above information to the tyre manufacturer customer service who will give you the correct running pressures.

This, I've always understood to be the best course of action but i just needed a double check that 65PSI'ish was in the ballpark. Thanks guys!

 

[BillyBear]

I have to ask.
Will the 15in wheels fit on your van?

 

[Phill D]

I have to ask.
Will the 15in wheels fit on your van?

thats a good question as many Ducatos upto a few years ago had different pitch circle measurements for 15" and 16"

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[vintageb3]

I have to ask.
Will the 15in wheels fit on your van?

They did last time i had them on the van.

Yes, they fit perfectly.