Roger

Both Eribamotters and I have 185 R14 C 102 tyres (see earlier posts). Mine came withe van from new in 2017. The C stands for a “commercial” grade tyre. Tyre pressures for these, as confirmed by Lowdhams and Leisure World, should be 48psi.

Hope this helps

Kevin

Quote: Randa france wrote in post #1

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I've decided to lose some tyre pressure however so rather than running them at 44psi I've dropped them to 38psi (hope that'll do?).

Randa

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Hmm, I understand the history, the need for side-wall suspension and the problem about availability but, ..... methinks tyre technology may have moved on in the last 10 years so I'd probably go with current figures.

Afer all, if you go back far enough you'll find "recommendations" for cross-ply pressures and before you say anything, yes, I do remember them (just!) :)

There is an on-line calculator here that may be useful

https://www.tyresafe.org/caravan-tyre-pr...FoaAmUKEALw_wcB

Though I will say it gives a slightly higher recommendation of 52psi for my 165R13C 94 tyres (for 1000kg MTPLM) whereas I tend to run slightly lower at around 48psi. That has given me no problems. I think Colin has hit the nail on the head when he referes to the use of commercail (van) tyres now

I'd be interested of other people opinions of the accuracy of the calculator..

Hugh

Hiya Roger just checked mine and unless I am not understanding the recommendations correctly the book is saying 55 psi or 3.8 bar the chassis upgrade to 1400. That is on our new Troll the tyres are 185 R 14 C 102/100 Q 65 PSI.
Mrphy

I think if your tyre pressure is too low, the tyre flexes more and this flexing causes the sidewalls to get hot which can lead to catastrophic failure.
https://www.caranddriver.com/features/a2...-tire-pressure/

This whole tyre thing has been going round and round for ages.
I don't like high pressures it takes the suspension element out of the tyre and creates very real problems to the interior fixings. I have a rear facing dash cam and playing that back I was astounded at the noise inside the van from bumps in the road, no wonder doors fall off.

I don't understand why car tyres are frowned upon. Surely its about the load index and if the tyre can take the load, how does it know it's a caravan not a car?

I currently have commercial tyres which have to be inflated to about 45 psi but they are now in their 6th year and should be replaced. I've looked at car tyres with the appropriate load index for my Triton and they come out at an inflation pressure of 36psi. What am I missing here?

Car tyres are not manufactured to accommodate the greater range of conditions a commercial tyre could face vis-a-vis loading and terrain.

For that reason they are more ruggedly constructed - eg 8 ply rather than 6 for (most) cars as I understand it.

Also, the caravan tyre is part of its supsension (most caravan axles relying on a torsion rubber and hydraulic damper unlike the more sophisticated arrangements found on cars, again as I understand it)

Sure, a car tyre will perform for a while (just like a spacesaver spare tyre will) but it will eventually fail if used if used extensively, at speed or over harsh terrain.

Van manufacturers recommend the tyres they do to mitigate legal claims for loss, injury and/or death: your safety and that of others must surely be the reason to fit them above anything else?

I went down the van tyre route as well when they were 6 years old, with having the Familia axle uprated to MTPLM 1050kg it was on the cusp for the car tyre rating that it was originally on.