Tyre pressure (1 Viewer)

DBSilverfox

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Can I just make sure I have this right?

i have an Autoquest 100, maximum load on each axle is 1600 kg. The van is fitted with the standard tyres, 195/70R 15C, 104/102R

In the handbook it says tyre pressures front and rear should be 44psi.

If i check out this website Link Removed

It says it should be 57 psi. On the inside of the door there is a sticker saying the tyre pressure should be 58.

So am I right to ignore the handbook and go with the 57psi? It just seems to be a really big difference between the two "versions of the truth"

Thanks

David
 

paulmold

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I also have such a discrepancy between the handbook and the sticker/tyresafe website. I have been advised to always go by the sticker on the door post which is what I do.
 

icantremember

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The only sure way to get correct pressures is to contact the tyre manufacurer by tel or email with the details of your tyres ( size & rating etc all on the tyre sidewall) together with maximum axle loadings.

To get accurate axle loading it is worth using a public weighbridge with the m/h fully loaded.

I did this with Michelin and they replied very quickly with correct pressures.

Hope this helps

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GJH

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We run our Autoquest 100 on 44psi (as per Explorer Group recommendations) and it handles, noticeably, much better than at the higher pressure.

I downloaded a small HTML data sheet from the Explorer web site not long after we got our van. It has since been deleted from the Explorer site (they only maintain newer documents) but I will be happy to send it as an e-mail attachment if you wish David, just send me your e-mail address in a PM.
 
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DBSilverfox

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To get accurate axle loading it is worth using a public weighbridge with the m/h fully loaded.


Hope this helps

Thanks, yes, i took it over a weighbridge to check if i needed to go on a diet ::bigsmile:

We run our Autoquest 100 on 44psi (as per Explorer Group recommendations) and it handles, noticeably, much better than at the higher pressure.

.

I adjusted mine yesterday before going out and dropped them from the 50+ they were, down to 44. I agree the ride was much smoother and not so "bouncy". Then I discovered the web site, and that got me concerned...

Might check with the tyre suppliers. don't understand why it can't be simple :Angry:

David
 

poppys

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I have a Elddis Firestom,which is the same as the Autoquest on a Peugeot boxer base,with standard tyres.The door pillar sticker says 58 psi,it does seem to be a hard ride so I think I shall reduce the pressure to 50 and see how it goes.But if anyone gets the definitive answer could they please post it. Chris

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nannyjan

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Can I just make sure I have this right?

i have an Autoquest 100, maximum load on each axle is 1600 kg. The van is fitted with the standard tyres, 195/70R 15C, 104/102R

In the handbook it says tyre pressures front and rear should be 44psi.

If i check out this website Link Removed

It says it should be 57 psi. On the inside of the door there is a sticker saying the tyre pressure should be 58.

So am I right to ignore the handbook and go with the 57psi? It just seems to be a really big difference between the two "versions of the truth"

Thanks

David

Hi David, I have an Autoquest 130 and I was so confused with conflicting advice on tyre pressures so I telephoned the tyre manufacturers and they were so helpful. They advised me to drive to a weigh bridge station and get the front, rear and total axle weight and to telephone them back with these details and whilst on the telephone they advised me of the correct tyres for front and rear tyres. The front tyre pressure advised was 55 with maximum weight of 1516 and the rear was 66 with maximum weight 1755. Hope this is of help to you. I dont have their telephone number to hand but you will find it on their website www.conti-online.com Keep Smiling Nannyjan
 

GJH

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I've just had a look at the Explorer web site and found that they now have the Motorhome Handbooks in the Link Removed.

In the 2005 edition they say:
Q: WHAT ARE THE CORRECT TYRE SIZES/PRESSURES FOR MY MOTORHOME?
A: Tyre pressures for Explorer Group motorhome can be found by looking in the latest model section, or the Product Archive section on our website or by referring to the relevant Technical Specification section of this handbook.

Interesting that in the 2003 handbook the front and rear pressures are 44psi for all Autoquest/Avantgarde models but in the 2004 handbook they are 44psi for the 100 and 200 models but 66psi for the larger ones.

They don't have a contact e-mail address but there are geographic address and telephone/fax numbers Link Removed if anyone fancies contacting them.
 

motor roamin

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Hand books often give the wrong tyre pressure the reason being that this will usually give a better ride, but tyre pressures are so important to get correct for more than one reason, too lower pressure will cause overheating excessive tyre wear and poor fuel consumption, too higher pressure will cause excessive tyre wear poor handling, both can lead to a blow out and will cost money at best lives at worst.

icantremember is spot on with the best way to get the correct pressure and of course check them often, tyres are so often overlooked.

Hope this helps.

All the best Rick.

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GJH

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Hand books often give the wrong tyre pressure the reason being that this will usually give a better ride, but tyre pressures are so important to get correct for more than one reason, too lower pressure will cause overheating excessive tyre wear and poor fuel consumption, too higher pressure will cause excessive tyre wear poor handling, both can lead to a blow out and will cost money at best lives at worst.

icantremember is spot on with the best way to get the correct pressure and of course check them often, tyres are so often overlooked.

Hope this helps.

All the best Rick.
But surely if a handbook gave a pressure that (being wrong) was dangerous or even just if it led to excessive wear (= shorter life) wouldn't the company be liable for the consequences?
 
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DBSilverfox

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no phone number for Bridgestone, so email has been sent. Will let you know what they say :Smile:

David
 
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DBSilverfox

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Quick response from Bridgestone - very impressive:

Here was the question:

I have a Motorhome fitted with Bridgestone 195/70R 15C, 104/102R tyres. Handbook says inflate to 44psi, but door frame says 58psi. The van has been over a weighbridge and loading is as follows: Front: 1320kg (1600 max allowed), Rear: 1440 (1600 max). please can you advise optimum tyre pressure for safety and smooth ride for these loads? Thank you

Bridgestone Response:

Hello.
For the axle weights stated, the optimal pressure would be 57psi (based on 1400kg front and 1500kg rear)

Kind regards
BSUK Tech Dept

So there we go. Looks like i am spending another 20p to fill them up again. This hobby is all spend spend spend :ROFLMAO:

David

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motor roamin

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But surely if a handbook gave a pressure that (being wrong) was dangerous or even just if it led to excessive wear (= shorter life) wouldn't the company be liable for the consequences?

Correct that is why Ford are facing so many law suits in America over their Explorer model keeps turning over at speed, down to them giving wrong tyre pressures in the hand book to improve ride quality.

It could be that the hand book given with a motor home is the base vehicle before a body was put on it which of course would also be a lower pressure.

you wouldn't chuckle would you

All the best Rick
 
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DBSilverfox

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Hi Graham, yep that is the same manual I have. It makes no sense to me at all.

the difference between 44 and 57 is such a lot that it would seem that following the wrong advice could be dangerous. I might phone or email Explorer/Elddis/whoever to get an explanation. nothing to lose other than my patience...

David

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GJH

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Hi Graham, yep that is the same manual I have. It makes no sense to me at all.

the difference between 44 and 57 is such a lot that it would seem that following the wrong advice could be dangerous. I might phone or email Explorer/Elddis/whoever to get an explanation. nothing to lose other than my patience...

David

Good idea David - save me doing it :winky:
 
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DBSilverfox

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And the response from Elddis is "we would always say to go by the handbook".

OK decision made. Graham, if you have been running on 44psi safely, and if I think the ride feels smoother at 44 than at 57 (which it is) then I am leaving them at 44. Please update me if you have a blowout before I do though :winky: :ROFLMAO:

David
 

Terry

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You just got to ask yourself who knows more about tyres ? tyre manufacturers or M/H manufacturers :ROFLMAO::Eeek:
terry

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GJH

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You just got to ask yourself who knows more about tyres ? tyre manufacturers or M/H manufacturers :ROFLMAO::Eeek:
terry

But also, will tyre manufacturers have data for all types of use? :Smile:

For any product consisting of several parts it is reasonable to expect that the company putting those parts together understands their interaction and advises accordingly :Smile:

Just thought. I had the tyres replaced last year and the fitter was happy to go by the Explorer data sheet.
 

Terry

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That is why the loadings are given :thumb: Bear in mind your van is probably at max load all of the time where a commercial van is half full a lot of the time.Even then on some of the vans I used,they said something along the lines of more weight more pressure in the tyres :thumb:
Your choice but my money would be on the tyre maker knowing a lot more about tyres/pressures/loads than any van converter :thumb:
terry
If I were running at 44 I would be checking the tyre wear for signs of the shoulders wearing more than the middle
 

Geo

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Sorry boys
Tyre manf knows best, @ 44 I would expect excess heat build up and a blow out sooner rather than later
A tyre has only 4 jobs
Contact with the road
Weight carrying capacity
Speed rating
Stopping distance
all worked out and set by the Manf:thumb:
Your average white van 3.5t , if there is an average white van, runs at somewhere between 50 and 65
44 seem mighty low to me:Eeek:
But hey, I drive an RV, what do I know about Ice Cream vans:winky:

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Terry

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Sorry boys
Tyre manf knows best, @ 44 I would expect excess heat build up and a blow out sooner rather than later
A tyre has only 4 jobs
Contact with the road
Weight carrying capacity
Speed rating
Stopping distance
all worked out and set by the Manf:thumb:
Your average white van 3.5t , if there is an average white van, runs at somewhere between 50 and 65
44 seem mighty low to me:Eeek:
But hey, I drive an RV, what do I know about Ice Cream vans:winky:

You know they blow under inflated tyres out :ROFLMAO::winky:On the plus side M/H's only average a few miles per year ::bigsmile: and probably driven slow at that :thumb::ROFLMAO::ROFLMAO:
terry
 

motor roamin

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Sorry boys
Tyre manf knows best, @ 44 I would expect excess heat build up and a blow out sooner rather than later
A tyre has only 4 jobs
Contact with the road
Weight carrying capacity
Speed rating
Stopping distance
all worked out and set by the Manf:thumb:
Your average white van 3.5t , if there is an average white van, runs at somewhere between 50 and 65
44 seem mighty low to me:Eeek:
But hey, I drive an RV, what do I know about Ice Cream vans:winky:

Basically what I said, tyre manufacturers spend hundereds of thousands on research and development for a reason, that is to get it right.

All the best Rick

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Geo

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I'm getting more and more confused all the time :Smile:
Is that possible Graham
Don't forget the time you turned up at the round head reenactment with a Samurai sword and AK47, saying you like edge yer bets:Eeek::Doh:
 

GJH

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Is that possible Graham
Don't forget the time you turned up at the round head reenactment with a Samurai sword and AK47, saying you like edge yer bets:Eeek::Doh:

:ROFLMAO:

Our van had Goodyear Cargo G26 Van 195/70R15 Tyres fitted when we bought it and I had them replaced with the same last year. I've just sent an e-mail to Goodyear asking what they recommend. I've also asked for a brief explanation of why, if their answer differs from the Explorer recommendation.

Hopefully that will tell me whether I need to pack Cruise missiles or a bow and arrows for Newark :roflmto:
 

Geo

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:ROFLMAO:

Our van had Goodyear Cargo G26 Van 195/70R15 Tyres fitted when we bought it and I had them replaced with the same last year. I've just sent an e-mail to Goodyear asking what they recommend. I've also asked for a brief explanation of why, if their answer differs from the Explorer recommendation.

Hopefully that will tell me whether I need to pack Cruise missiles or a bow and arrows for Newark :roflmto:
We are talking new tec specialist tyres here Mr Graham not run o the mill van/commercials:Doh:
Be interesting to see what they say re running pressures
A tyre is a tyre is a tyre -------NOT

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