Tyre pressure advice please (1 Viewer)

Affiliate links here may earn MHF compensation
Dec 18, 2011
759
514
Hull
Funster No
19,200
MH
Autotrail 634
Exp
Since 2006
I have had the pressures at about 69 psi from new on my 3.5 ton autotrail but read somewhere it should be nearer 80.I have increased the pressure to 80 and although the MPG seems to have improved the ride hasn't,and it feels hard,is you feel every bump.Any advice please on what pressure is best.Maybe somewhere between the 2?
 

Jaws

LIFE MEMBER
Sep 26, 2008
23,864
73,630
Thetford Norfolk
Funster No
4,189
MH
C class, Chieftain
Exp
since 2006 ( I think ! )
I have had the pressures at about 69 psi from new on my 3.5 ton autotrail but read somewhere it should be nearer 80.I have increased the pressure to 80 and although the MPG seems to have improved the ride hasn't,and it feels hard,is you feel every bump.Any advice please on what pressure is best.Maybe somewhere between the 2?
When we had a similar van we ran at 65 all the time as that is what the converters said.
Check in the Swift manual as it is the only place the info for your van will be correct
 

Riverbankannie

LIFE MEMBER
Mar 11, 2016
10,784
62,929
Bristol
Funster No
41,967
MH
IH 630 RL PVC
Exp
12
If you know your axle weights, you can ring the tyre manufactures help line and get accurate pressure information.
Mine are Continental Vanco and although running at 3400kg total, the pressure given were 45psi rear and 48psi front which actually we find a bit low so we do put 55 in.
 

Gellyneck

LIFE MEMBER
Jun 5, 2014
9,646
19,500
Scotland
Funster No
31,836
MH
C Class
Exp
More than toes wet now!
We've got a 2013 AT Frontier Savannah (4,250kg) and run at 69psi front and 80psi rear.
Whilst the handbook says 80psi all round that has to be generic as the handbook covers the full Frontier range, including the tag axle models.
So, and as @Riverbankannie says, I looked at the Continental technical databook and used those recommendations (adjusted slightly as the axle weights aren't exact matches and to trim the ride comfort).
I've attached an extract of the page \ data I used.
 

Attachments

  • Continental extract (wip).pdf
    72.7 KB · Views: 75

MikeD

Free Member
Dec 21, 2011
3,936
3,697
London
Funster No
19,230
MH
IH PVC
Exp
Since 2012
Our 3.65ton Tracker was 5 bar at the front and 5.5bar at the rear.

The manufacturers recommended pressures should be in the Autotrail manual.

Subscribers  do not see these advertisements

 
Sep 28, 2015
2,095
2,720
Kingston upon Hull, East Yorkshire.
Funster No
38,946
MH
Hymer B544
Exp
2001 Caravans 2011 Motorhomes
Tyre pressures are such an individual thing that depends on tyre/wheel size and axle weight which is variable from motorhome to motorhome according to what you carry, equipment, how many of you there are and tyre type.
Asking others with similar motorhomes isn’t any help really.
The only way to know is to get weighed, front and rear axle, when loaded as if ready for a trip.
Then you are either in the “motorhome tyres must be pumped up hard” club or not.
Personally I’m not and prefer to listen to Continentals advice so we are 3.25 bar front and 4.25 bar rear.
If you choose the “pump em up hard club” then it’ll be 65psi front and 80psi rear regardless of your weights.
 

TCG

Jul 6, 2017
1,377
2,076
Salford Priors
Funster No
49,363
MH
Autotrail Delaware
Exp
2016
We've got a 2013 AT Frontier Savannah (4,250kg) and run at 69psi front and 80psi rear.
Whilst the handbook says 80psi all round that has to be generic as the handbook covers the full Frontier range, including the tag axle models.
So, and as @Riverbankannie says, I looked at the Continental technical databook and used those recommendations (adjusted slightly as the axle weights aren't exact matches and to trim the ride comfort).
I've attached an extract of the page \ data I used.
agree with gellyneck.. AT delaware 70psi front 80psi rear - works for me
 

Camdoon

LIFE MEMBER
Sep 22, 2012
1,537
2,812
UK
Funster No
22,981
MH
Adria Matrix Supreme
Exp
2012
We found out our axle weights and wrote to Continental who were happy to tell us the recommended pressures. Mine are 3.75 and 5.25 which just happen to be floppy disk sizes (that is an aide memoire - I have not fitted floppy disks). :)
 

JFD

Apr 9, 2015
392
238
Crawley Down, West Sussex, UK
Funster No
35,784
MH
Pilote Aventura G730
Exp
since 2014!
I would follow Camdoon’s advice, and write to the manufacturers of your tyres, with details of your motorhome weights.

We have a letter from Continental, quoting pressures for our motorhome, including a surprising piece of advice, to increase the pressures in the front tyres, to counter the weight shift during braking!

Subscribers  do not see these advertisements

 

PeteH

Free Member
Nov 22, 2007
6,852
9,032
East Riding of Yorkshire
Funster No
900
MH
Rapido, 999M.
Exp
18+yrs plus 25+Towing
The suggested Front /Rear pressures for our Rapido is 47/55psi. However They currently run Front 60psi Rear 70psi Cold. (R235/65 R16) Continentals Tyre Pal Monitored.
 
D

DL42846

Deleted User
Our 3.5 ton fiat Ducato runs on 5 bar (72 psi) front and 5.5 bar ( 80 psi) rear. YOu should find the tyre pressure recommendations on the inside of the drivers or passenger door. I also emailed Michelin head office and double checked. They confirmed the above pressures were correct.
 

Augusta08

LIFE MEMBER
Aug 25, 2015
975
1,474
Morbihan
Funster No
37,886
MH
Autocruise Augusta
Exp
Since 2001
We've found temperature makes a profound impact. Our 4,500kg x250 has a "target" of 75psi front 80psi rear , on Michelin Agilis 225 75R16. The cold (5C) pressures are 67 & 73 respectively, when running they soon hit pressure. When it's warmer they quickly get up to 77 & 84. For me I need to adjust pressures to the environment and purpose. The 118 tyres are rated at 1250kgs at 75psi.

HTH

Gerry
 
Apr 27, 2008
11,872
14,146
Eastbourne East Sussex
Funster No
2,327
MH
Hymer low profile
Exp
Since 1972
I use the recommended pressures from the tyre manufacturer for our axle weights. 54psi front 69psi rear. I doubt if any two motorhomes have the same correct pressures which depends on the tyres and the actual loading. The tyre manufacturer will tell you what your pressure should be once you've weighed each axle.
 

denisejoe

LIFE MEMBER
Aug 6, 2014
5,687
12,468
Warden isle of sheppy
Funster No
32,702
MH
A Class
Exp
Since 2004
Check the tyres for the max pressure they can take our toyo’s Have a max pressure of 70 psi but we run at 50 psi

Subscribers  do not see these advertisements

 

pappajohn

LIFE MEMBER
Aug 26, 2007
43,504
50,968
Dark side of the moon
Funster No
172
Exp
Since 2005
Ask your insurers, after all if you have an accident and the assessor/loss adjuster decides they were over/under inflated they may hold you partly responsible so they must know the pressures. ;)
 

Join us or log in to post a reply.

To join in you must be a member of MotorhomeFun

Join MotorhomeFun

Join us, it quick and easy!

Log in

Already a member? Log in here.

Latest journal entries

Funsters who are viewing this thread

Back
Top