Tyre Pressures

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Post by PedairOlwyn on Mon Mar 26, 2018 1:02 pm

Thanks for the thread on tyre pressures.

What is the recommended pressures for F&R on a 2017 Broadway FB on a Peugeot Boxer please? I'm getting mixed advice.....
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Post by Cymro on Mon Mar 26, 2018 1:16 pm

Henffych!  What make of tyre? What size tyre? what is your front axle weight in fully loaded mode? Ditto for rear axle?

Only by knowing those facts can one look up the tyre pressures chart from the tyre manufacturer to determine the right pressure for your unique situation. 

If you serach the Forum, you'll find that Tyre Pressure is a recurring theme!

Cymro

For my Peugeot NuevoES (having weighed the axles) the Continental tyre chart suggests about 44 psi for the front, and 70-ish for rears. I've been too wary of dropping fronts to 44 (and having to pay Peugeot £40 to reset the TPMS to show a warning at say 40psi). And I am not happy of having a difference of some 25 psi between front and rears.

So I chickened out, and am running at about 53 Front : 73 Rears.  [TPMS was reset for 50:69] That has seemed fine.  Wish I had Peugeot reset lower, to - say - 40: 60, which would have allowed me to run at 45: 65, but I ain't going to pay another £40!


Last edited by Cymro on Mon Mar 26, 2018 1:19 pm; edited 1 time in total (Reason for editing : Added PS)
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Post by chrisk on Mon Mar 26, 2018 2:44 pm

I think most confusing about tyre pressures are in our car we have them inflated to a set pressure, which is different if more than one passengers, if you have a van full up every day for work we would use the tyre setting for a full loaded van pressures for that van. Now for a motorhome if you set pressures for max load chances are it will be a bumpy ride, thats why you weight the vehicle as loaded for going away then consult tyre pressures for make of tyre for each axel.

When we bought our van tyre pressure were wrote down as 50 front rear 70 i have new tyres fitted checked pressure from continental i now have 45 f and 60 r a much better ride.
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Post by Molly3 on Tue Mar 27, 2018 1:52 pm

When I collected my nuevo ek I was told to use the tyre pressure as stated on ns side door frame  .5 bar and 5.5 bar not variable for different loads .?.
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Post by PedairOlwyn on Tue Mar 27, 2018 2:19 pm

That would seem to be the correct advice, but members talk about the need to weigh  the 'van, contact the tyre manufacturer etc. Most confusing for a motorhome newbie! Caravan and car tyre pressure seemed much more straight forward!

Our Broadway FB seems to have the same tyre pressures as your Nuevo EK even though it's a slightly bigger 'van! Even more confusing!

I'm awaiting a response from Continental Tyres at the moment..... Shall post their reply.....
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Post by chrisk on Tue Mar 27, 2018 2:30 pm

Here is my reply from Continental




Hello Chris,

Many thanks for sending across the relevant tyre details it is most appreciated.

I have had a look at my current database and can see the options you have seen but they are now older models and have stopped production (you may still find stock of these tyres). Having said this the 235/65 R16 C 121/119 R VanContact 4 Season is one of our newest tyres and should meet all your requirements. It has directly replaced the Vanco Four Season 2.   

I have attached a product fact book highlighting this tyre.  



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.
 
Based on the following:

235/65 R16 C 121/119 R VanContact 4 Season tyres.
 
(*C- Commercial) (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 for when you have had the vehicle weighed accordingly.  

[You must be registered and logged in to see this image.]


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
[You must be registered and logged in to see this link.]
Alex Wilson

Product Support Engineer

Visitors Address:
Continental Tyre Group Ltd
DC2 Castle Mound Way
Rugby
United Kingdom
CV23 0WB
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Post by Cymro on Tue Mar 27, 2018 2:46 pm

All of which very helpfully and authoritatively confirms the procedure which has been long recommended on the Forum.
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Post by PLOUGHLIN on Tue Mar 27, 2018 3:37 pm

Here is the complete Continental Tyres Pressure book. The above is an extract page 88 & 89.

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Post by Peter Brown on Tue Mar 27, 2018 3:43 pm

Its six years since I last experimented with pressures, since then I've been running 52/70 and very happy. With leaf springs in mind, I've dropped to 45/60. I was out in the van last night for the first time, I found the steering heavy and jerky and all the speed bumps and potholes felt as jarring as before.

I determined to leave them at these pressures for the next month or so as I'm not venturing too far but extrapolating from the table posted by chrisk, I think the back is to low so am going to go to 46/66 for my experiment.

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Post by PedairOlwyn on Tue Mar 27, 2018 3:57 pm

The answer from AS themselves as of yesterday reads: "......the only advice I can give you on tyre pressures is to load the vehicle ready for a trip, have it weighed and speak to a tyre specialist and they will be able to work out the pressures for you."
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Post by Peter Brown on Tue Mar 27, 2018 3:58 pm

PedairOlwyn wrote:The answer from AS themselves as of yesterday reads: "......the only advice I can give you on tyre pressures is to load the vehicle ready for a trip, have it weighed and speak to a tyre specialist and they will be able to work out the pressures for you."

If you search this forum you will find that advice given about a thousand times.

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Post by chrisk on Tue Mar 27, 2018 4:01 pm

Peter Brown wrote:Its six years since I last experimented with pressures, since then I've been running 52/70 and very happy.  With leaf springs in mind, I've dropped to 45/60.  I was out in the van last night for the first time, I found the steering heavy and jerky and all the speed bumps and potholes felt as jarring as before.

I determined to leave them at these pressures for the next month or so as I'm not venturing too far but extrapolating from the table posted by chrisk, I think the back is to low so am going to go to 46/66 for my experiment.


Extrapolating  had to look that word up.
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Post by PLOUGHLIN on Tue Mar 27, 2018 4:07 pm

He probably meant Interpolating though? hugegrins

Interpolating between 2 values
Extrapolating beyond 1 value

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Post by Peter Brown on Tue Mar 27, 2018 4:28 pm

extrapolating (present participle)
extend the application of (a method or conclusion) to an unknown situation by assuming that existing trends will continue or similar methods will be applicable.

I think that's what I meant to say.

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Post by PLOUGHLIN on Tue Mar 27, 2018 4:35 pm

In the [You must be registered and logged in to see this link.] field of [You must be registered and logged in to see this link.], interpolation is a method of constructing new [You must be registered and logged in to see this link.] within the range of a [You must be registered and logged in to see this link.] of known data points.

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Post by Peter Brown on Tue Mar 27, 2018 4:48 pm

Got to go and cook tea.......

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Post by MikeJJ on Tue Mar 27, 2018 5:19 pm

What I am waiting for is the discussion to turn to "C" tyres versus "CP" tyres.

Arguably with C tyres there is greater scope to vary the pressure to match more closely the actual loading.  With CP tyres which were specifically designed to a specification with ETRTO to cater for heavily loaded rear axles of motorhomes (or even overloaded) and long periods of stationary loading there is a much stricter pressure recommendation.

I don't think the Continental Databook covers CP tyres.  To date Michelin will not budge from a standard pressure recommendation for the rear axle when using their CP tyres.
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Post by PedairOlwyn on Tue Mar 27, 2018 5:24 pm

Received this chart from Continental this pm re the tyres on our Broadway FB:
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Last edited by PedairOlwyn on Tue Mar 27, 2018 11:01 pm; edited 1 time in total
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Post by PLOUGHLIN on Tue Mar 27, 2018 5:56 pm

MikeJJ wrote:What I am waiting for is the discussion to turn to "C" tyres versus "CP" tyres.

Arguably with C tyres there is greater scope to vary the pressure to match more closely the actual loading.  With CP tyres which were specifically designed to a specification with ETRTO to cater for heavily loaded rear axles of motorhomes (or even overloaded) and long periods of stationary loading there is a much stricter pressure recommendation.

I don't think the Continental Databook covers CP tyres.  To date Michelin will not budge from a standard pressure recommendation for the rear axle when using their CP tyres.

The Continental VanContact Camper (page 76) is noted as CP standard. The Tyre book linked above covers all Continental Tyre types.

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Post by MikeJJ on Tue Mar 27, 2018 6:25 pm

Peter, thanks for correction had completely missed that.
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Post by MikeJJ on Wed Mar 28, 2018 10:11 am

So a few minutes looking at the Tables showed  that the equivalent "CP" tyre to my "C" rated (original fitment) would have to be run at 10psi higher pressure.  Additionally the C rated tyre has greater inherent load capacity as it is a 10ply tyre compared to an 8 ply tyre if that was required.  Makes one question whether the CP tyre is relevant - just wondering?
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Post by Peter Brown on Tue Apr 10, 2018 5:22 pm

I've now done about 300 miles on various types of road at 46/66 and am happy. The differences I've noted between the 52/70 I've been using for the last 6 years are:

Heavier steering took a little time to get used too but steering more precise at speed.

No reduction in rattles when hit pothole etc. but considerable reduction in road noise.

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Post by daisy mae on Tue Apr 10, 2018 6:32 pm

I go by the door plate  always have done so on all three MH `s I have had, never a problem, and a comfortable ride, my van is always loaded, never empty. jmho and suits me.
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Post by chrisk on Tue Apr 10, 2018 8:21 pm

Since I had my new tyres at 45 and 65 much better ride than 50 and 70
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Post by mikethebike on Tue Apr 10, 2018 9:07 pm

+1

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