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post #1 of 22 (permalink) Old 17-05-2013, 12:33 PM Thread Starter
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Tyre pressures

My Peugeot Boxer 335LWB campervan has what is politely termed a rather firm ride. Going by the sticker inside the driver's door I should be inflating the tyres to 70psi. My tyres are Bridgestone Duravis 220/70/15c light truck not specialist camper tyres.
I took the van fully loaded ready to go on holiday to a weighbridge yesterday. The front axle weight was 1720kg and the rear 1420kg.
According to the Tyresafe website I should have the front tyres at about 48psi and the rears at about 38psi. I have emailed Bridgestone for their advice but no reply as yet.
Does anyone have any advice on this?
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post #2 of 22 (permalink) Old 17-05-2013, 01:03 PM
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Each van is different and so an exact answer is virtually imposssible to give. I am suprised that Bridgestone have not replied. I am fitting Michelin Agilis Camper tyres this weekend and e-mailed Michelin for advice on pressures. They responded promptly and quoted that the suggested pressure for the rears is 80psi and 55psi on the front ( 2000kgs rear axle, !700kgs front)

They quote "The suggested tyre pressure for the rear of a motorhome running on the Agilis Camping is 80psi. This is due to the construction of the tyre with 2 casing plies enabling the use of higher pressures. Its construction and the use of higher pressures is designed to cope with continual heavy loads sometimes found on Motorhomes and can help with wear pattern issues if lower pressures are used particularly on the rear axle."
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post #3 of 22 (permalink) Old 17-05-2013, 01:44 PM Thread Starter
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Tyre pressures

I noticed on the Tyresafe website that Camper tyres are inflated to a much higher level than standard light truck tyres. As you say this reflects the greater load carrying capacity of these tyres. It seems that most coachbuilts and some A class motorhomes tend to be loaded to the maximum weight capacity. My campervan still has a spare payload reserve of about 350kg and most of that available at the rear. I have always inflated the rear tyres to a higher pressure than the front but it seems I may have to rethink that.

PS
I noticed on one of the tyre related sites I was browsing that tyre fitters are recommended that tyres with an inflation capacity above 50psi should be inflated behind a safety cage.
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post #4 of 22 (permalink) Old 17-05-2013, 01:47 PM
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Michelin changed their advice some time ago re rear tyres.
Prior to that they used to recommend a lower rear tyre pressure.
Mine is 50 front and 55 rear as recommended by them.

They would now say 70 or 80 for the rear tyres!

This PDF gives a good indication:-

http://www.motorcaravanning.com/tyre...h_tyres_08.pdf

Ted.
I try and state simple facts in a nice way.
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post #5 of 22 (permalink) Old 17-05-2013, 01:54 PM Thread Starter
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Tyre pressures

That's the same leaflet I've been quoting. I think the higher pressures are only for Camper rated tyres. If motorhomes use these higher pressures on standard light truck tyres as fitted to my Autocruise Rythym campervan there could be be a safety issue with over inflation.
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post #6 of 22 (permalink) Old 17-05-2013, 02:13 PM
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The quote was definitely for Camper tyres.
As for the high pressures, we have had the van for 3 years and done approx 10000 miles. It is presently fitted with XC Camper tyres at 80 psi on rear and in all that time , although frequently checked, I have never once had to top up the pressure. This to me is another advantage of Camper tyres
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post #7 of 22 (permalink) Old 17-05-2013, 03:50 PM
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Re: Tyre pressures

Quote:
Originally Posted by ksblair
My Peugeot Boxer 335LWB campervan has what is politely termed a rather firm ride. Going by the sticker inside the driver's door I should be inflating the tyres to 70psi. My tyres are Bridgestone Duravis 220/70/15c light truck not specialist camper tyres.
I took the van fully loaded ready to go on holiday to a weighbridge yesterday. The front axle weight was 1720kg and the rear 1420kg.
According to the Tyresafe website I should have the front tyres at about 48psi and the rears at about 38psi. I have emailed Bridgestone for their advice but no reply as yet.
Does anyone have any advice on this?
Are you sure they are 220 width ( not 215 or 225 ), that would be unusual.

check size again and post here including load index and I will tell you what Continental say pressures would be for their van tyres of your size. At a guess I would say that 48/38 is about right though.
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post #8 of 22 (permalink) Old 17-05-2013, 04:16 PM
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KSBLAIR, I have reduced my pressures similar to the ones you have quoted and the steering is vastly improved, especially when going roundabouts in the wet. On the recommeneded higher pressures I had terrible understeer and had I continued at those pressures I am sure it would have resulted in an accident.
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post #9 of 22 (permalink) Old 17-05-2013, 04:17 PM
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Re: Tyre pressures

Quote:
Originally Posted by BrianJP

check size again and post here including load index and I will tell you what Continental say pressures would be for their van tyres of your size. At a guess I would say that 48/38 is about right though.
Please be advised this information may be of no value to you and possibly down right dangerous as the information from Continental is for their tyres only.
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post #10 of 22 (permalink) Old 17-05-2013, 04:55 PM
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Re: Tyre pressures

Quote:
Originally Posted by ksblair
My Peugeot Boxer 335LWB campervan has what is politely termed a rather firm ride. Going by the sticker inside the driver's door I should be inflating the tyres to 70psi. My tyres are Bridgestone Duravis 220/70/15c light truck not specialist camper tyres.
I took the van fully loaded ready to go on holiday to a weighbridge yesterday. The front axle weight was 1720kg and the rear 1420kg.
According to the Tyresafe website I should have the front tyres at about 48psi and the rears at about 38psi. I have emailed Bridgestone for their advice but no reply as yet.
Does anyone have any advice on this?
If you can give me the load index rating and the maximum tyre pressure off the tyre wall I have a spreadsheet that seems to produce pretty good results.
Worth a try?

Andy
My Aire galleries HERE
Use of the tab will get you more answers

Excusez-moi si mon message est perdu dans la traduction
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