Tyre pressure advice please help

TedDuf

TedDuf

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Aug 24, 2018
Posts
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Location
Colchester,Essex
Funster No
55,828
MH
Autocruise Starblazer 04
Exp
I’m a newbie
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Hi everyone, we are proud owners of our first motorhome - a Peugeot Boxer 330 Autocruise Starblazer 2004 gross weight 3850kg.
Been trying to google what the correct tyre pressure should be and having a nightmare?
The tyres are all Michelin 215/70R15 CP 109Q.
I will try and attach photos of the plate inside the door, which I understand means 79psi all round ?
I have checked the current pressure and the front are saying 52 psi and the rear 72 psi!
Any thoughts would be gratefully received
 
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Thankyou, I attach a photo of the vehicle plate. Am I right in thinking this means it’s 1750kg on the front and 1900kg on the rear?

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Just a note, the vehicle plate showsGVW at 3400kg not 3850

Is there a later plate added?

VOSA not interested in the V5
 
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Look for the converters plate (Autocruise) which should show the 3850kg, then use the weights from 1 & 2. 1 being the front axle.
Cheers
Ed
 
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You need to load the MH with your normal bits and pieces including water etc. And head off down to your local weigh bridge. Get the weight on the front axle and the weight on the rear axle. You can then find out what the tyre pressures should be from the manufacturers. If you try 79psi you will rattle your teeth out especially on the front.

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I wouldn't go as low as 52psi myself, but I do think it runs better with slightly lower pressures. I am also less concerned about the pressures getting too high when it gets hot.
 
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Agreed that the weigh bridge is the only option, 109 rated tyres are good for 2060kg per axle so pressures are going to be reasonably high if you are anywhere near your axle weights.

Martin

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@Sheddy @Hettie's Crew
Interesting conflict of opinion. Used the same size & weight information but
Continental link recommends 58F & 76R
The tyresafe link says 63F & 82R
 
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Michelin always recommend the max pressure in the rear tyres to take account of the maxium load so it's always 5.5 bar (79 psi) but 5.5 bar in the front is way too high.
Best pressure to run at depends on the vehicle & max loading, I'm on a 4500 kg chassis with recommended pressures of 65 psi front & 79 rear, boneshaker ride so I dropped them to 60 front, 65 rear. It did not make any difference to the ride at all, so now running at 65 & 75.
 
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The pressures are more variable than any stated plate. You might have "cheaper" lower ply rating tyres, as well as many other factors that could influence the "correct" pressure to use.
Best bet is try a sensible middle ground, see how it handles and how it wears.
Personally I like running them in bone shaking territory on 10 ply 114 R contis at 80 psi all round. Same 3850kg (ducato) for the better mpg
 
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Always thought of tyre safe as good general guide but would be happier with the manufacturers recommendations, if on Continental tyres that is, as Michelin don’t produce a technical guide to help their customers.
 
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Hettie's Crew said:
Always thought of tyre safe as good general guide but would be happier with the manufacturers recommendations, if on Continental tyres that is, as Michelin don’t produce a technical guide to help their customers.
Click to expand...

Think I might split the difference & try
60F & 80R

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DP_JAY said:
@Sheddy @Hettie's Crew
Interesting conflict of opinion. Used the same size & weight information but
Continental link recommends 58F & 76R
The tyresafe link says 63F & 82R
Click to expand...
The advice from Continental is specific to their tyres. The other website is generic and is a good starting point for other makes but it still conflicts with Michelin's advice for their tyres. :)

This whole subject is a bit of a muddle and is why I've stuck with Continental as their recommended pressures for our van work well.
 
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When I contacted Continental with our axle weights they sent an attachment covering all their tyres. This is the one that covers the 215/70 R15 -109 cp tyres.
 

Attachments

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The tyre manufacturers recommended pressures are the way to go.
 
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DBK said:
This whole subject is a bit of a muddle and is why I've stuck with Continental as their recommended pressures for our van work well.
Click to expand...

Same here - but when it goes in for service the tyres are always inflated to the maximum as shown on the tyre sticker so we have to adjust them all again. I did show the mechanic the Continental tyre pressure chart but he just pointed to the Fiat sticker and even though I told him that was for the base vehicle in delivery van guise he said he had to go with that. I gave up trying to explain about different tyres and loads and just went to the nearest garage to let air out.
 
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Puddleduck said:
Same here - but when it goes in for service the tyres are always inflated to the maximum as shown on the tyre sticker so we have to adjust them all again. I did show the mechanic the Continental tyre pressure chart but he just pointed to the Fiat sticker and even though I told him that was for the base vehicle in delivery van guise he said he had to go with that. I gave up trying to explain about different tyres and loads and just went to the nearest garage to let air out.
Click to expand...

Where I get mine serviced they just write in the service sheet ( tyre pressures set by customer)

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I have the same Michelin tyres and very similar max axle weights.
I wrote to Michelin.
They advised 80psi rear and 65psi front.
The 80psi on the rear is due to the tyre being at max load so presure should not be reduced.
 
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Hello,

Slight variation to the on going thread. My local garage's pressure machine only goes up to 60 psi and I need 80 psi. Where do you all go to do your tyre pressures?


Thanks


Stephen
 
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TheBows said:
Hello,

Slight variation to the on going thread. My local garage's pressure machine only goes up to 60 psi and I need 80 psi. Where do you all go to do your tyre pressures?


Thanks


Stephen
Click to expand...
I use one of these,

topeak-joe-blow-max-hp-track-pump-black-EV162330-8500-30.jpg


It's a cycle track pump and will go to 160psi so 80 is no problem, If you don't want the exercise I would suggest one of the electric pumps that plug into your cigarette lighter socket.

Martin
 
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I've got three of these type of things plumbed together in the garage (you dont need three, I was just being greedy as they were on offer and my shotblaster eats air for breakfast) got mine from aldi but the same thing as long as its 8 Bar / 116 psi

Broken Link Removed
 
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TheBows said:
Hello,

Slight variation to the on going thread. My local garage's pressure machine only goes up to 60 psi and I need 80 psi. Where do you all go to do your tyre pressures?


Thanks


Stephen
Click to expand...

Some of the newer air pumps at garages do go to 80psi.
The one I use has this as a max setting.
After checking it with a gauge afterwards it only actually gets to about 75psi and I put the rest in with a cheapo 12v pump , works out at about 1minute per psi cos it's working hard at this pressure.

I don't compromise on this, I think I read somewhere that 5psi deficit equals the equivalent of about a 100kg overload
 
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