Tyre temperatures

I've no idea, but there are far hotter countries than ours where any tyre temp problems would show them selves sooner

See Here    I'm sure a bit more googling with more information will throw up actual figures for your particular brand and range of tyre.

Both rises seem excessive.  Usual reason would be under inflation but with TPMS you will be checking that.  Is the base figure you have correct - see above post.

Have you had the vehicle from new?   Could they be wrong tyres altogether?

 

 

Under inflation was my concern which is really why I posed the question. It seems from searching the net a 10C rise in temperature above ambient is not unusual after a half hours drive. Add in strong sunshinet and it can be much higher. Nevertheless it would be useful to read of the experience of others. Still not found anything about safe operating temperatures which would help in setting the alarm point. This brings me to another point. Tyres are marked with a max PSI. I presume this is a cold pressure?

peedee

My single axle caravan tyres running at 60psi cold (~25C) hit 60C and 69psi -72psi at motorway speeds in a UK summer as monitored by my Tyrepal with internal sensors. 

My towcar psi increases by 3- 6 but I guess that is because each tyres loaded with 300Kg rather than 750Kg on the van

Oops car is more like 500Kg per tyre.

Found this stating summer road temps can reach 50C so not suprising tyres get to 60-70C in summer

 

https://www.bbc.co.uk/news/magazine-23315384

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Already weighed it and used the handbook figures for the pressures for the actual weight. It would appear high temperatures are nothing unusual. I have certainly not seen anything like the temperature increases what Viatorem quotes although I regularly see increases in PSI of 10 from cold.

One article I have seen says that tyres should be inflated for the MTPLM given that most motorhomes run fully laden which is probably why if you consult Michelin they give a figure of 80psi for their camper tyres.

peedee

My Tyrepal TPMS is set to display  PSI not temperature. The rears that start off at 80 psi will go up to 94 psi on a long run. The fronts will go from 55 to 65. When setting up the system I followed their guidelines, The alarm did go off once in Germany which I never quite got to the bottom of.

David