Adria matrux 670sl owners (1 Viewer)

[Trout bum]

Just looking for some help , due to covid can't get onto local weighbridge to get axle weights to help find out tyre pressures, so can anyone help with what tyre pressures you are running with that I can use as a guide ,until I can get van weighed ,

 

[Camdoon]

"
Thank you for your email and I completely understand your concern.

It is extremely likely that the relevant information supplied with the chassis is documented for use as a commercial vehicle, therefore proposed before the conversion to a motor home. For this reason, Continental tyres would always recommend having the motor home weighed on a weigh bridge at your heaviest travelling weight, including liquids to achieve specific axle weights. In some cases the coach builder will also put their recommended pressures on the vehicle plate. However, the majority put this to the maximum inflation pressure of the tyre to cover all loads being applied and not specific loads which often, are not near the plated weight you actually travel at.

The volume and pressure of the inflation medium is what carries the load and if it is not sufficient then the tyre can suffer damage, hence why it is extremely important for the correct loads to be obtained, in order to inflate the tyre correctly.

Experience shows that due to the weight distribution of vehicles in the leisure industry such as motor homes the likelihood of overloading or uneven weight distribution tends to put a greater load on the rear axle rather than on the front axles, where the weight tends to remain more consistent. It is true that when braking occurs the weight transference is to the front, but this only tends to be for short periods, whereas overloading on the rear axle can be present over long periods, when the tyres are rotating at high speed.
This is the main reason that with CP Camper type tyres the inflation pressures at the rear is deliberately set higher. Although this also has a bearing on the contact area when negotiating grassy parking areas and also to the sidewall deflection, which influences the body roll.

The 69 psi written on the side of the tyre is for the Northern American market only and the inflation pressure of the tyre can exceed this value within its safety operating range.

Based on the following:

ContiVanco Camper 225/65 R16 (CP*) 112 R tyres.

Front Axle: 1850 Kg - 3.75 bar/ 47.1 psi (maximum weight for pressure given = 1855 kg)

Rear Axle: (single fitment) 2100 Kg - 5.25 bar/ 76.1 psi (maximum weight for pressure given = 2160 kg)

Rear Axle: (twinned fitment) 2100 Kg - 3.0 bar/ 43.5 psi (maximum weight for pressure given = 2870 kg)


(*CP- Camper) (Single fitment (S) = two wheels per axle, Twinned fitment (T) = four (or more) wheels per axle)

I have included the chart for these specific tyres to help with pressure vs. load if you need to change the weight!

I hope this helps and any further enquiries (no matter how small) please do not hesitate to ask, we are always happy to help!

Best Regards

Alex Wilson
Product Support Engineer

Visitors Address:
Continental Tyre Group Ltd
DC2 Castle Mound Way
Rugby
United Kingdom
CV23 0WB


Direct Line: +44 (0)1788 566240
Fax: +44 (0)1788 517731
E-Mail: administrator.technical @conti.de
Web: http:// <Broken link removed>
"

 

[Trout bum]

Thanks , but as I said can't get to weighbridge at the moment due to covid so doesn't help much

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[Camdoon]

I go with the majority.

"However, the majority put this to the maximum inflation pressure of the tyre to cover all loads being applied and not specific loads which often, are not near the plated weight you actually travel at."

 

[royandsharont]

If you get no answers from someone who knows then you could always look at your max axle weights and use that to give the tyre pressures but it really does depend on your make & size of tyres. On my Bessacarr E480G 4005kg I always had trouble getting more weight over the front axle to keep the 40% guide but always weighed the van before setting off on the continent. The regular weights were 1590kg front & 2330kg rear & I used to run 3.5 bar at the front & 5.25 bar at the rear. The fronts should have been 3.0 bar according to the tyre makers for that weight but I felt that was a little too soft so used 3.5. The rear max was 5.5 bar on Continental Vanco Camper tyres. Hope this helps.

 

[Trout bum]

If you get no answers from someone who knows then you could always look at your max axle weights and use that to give the tyre pressures but it really does depend on your make & size of tyres. On my Bessacarr E480G 4005kg I always had trouble getting more weight over the front axle to keep the 40% guide but always weighed the van before setting off on the continent. The regular weights were 1590kg front & 2330kg rear & I used to run 3.5 bar at the front & 5.25 bar at the rear. The fronts should have been 3.0 bar according to the tyre makers for that weight but I felt that was a little too soft so used 3.5. The rear max was 5.5 bar on Continental Vanco Camper tyres. Hope this helps.

Thank you really appreciate that advice

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