Tyre PSI, Tyrepal settings for hot tyres and when to get new tyres

[DDJC]

Last week, I was checking tyres (VancoCamper 215/70 R15 109R CP) and re-fitting my Tyrepal sensors. Also, just got back from a weekend on the coast.
I’ve got three questions, that I am hoping that the clever tyre folk can answer.

1. Tyre pressures
I think we run pretty much to the maximum weight. No weigh bridge anywhere near me, so I am working on the assumption that we max at 3500kg and have 1900kg on the back axle and 1600kg on the front. According to the tyre pressure info supplied by Conti, that means that I should have Front tyres at 3.5 bar/51 psi and Rear tyres at 5 bar/72 psi. This seems to me to be very low on the front, but what do funsters think?

2. I had previously set the Tyrepal controller to beep if the tyres topped 80psi. It being March, I was surprised to see that the tyre temps were causing the PSI to go up by 10 or 12 and set the alarm off as they went over 80. In the past when we have been in Italy, we’ve seen tyre pressures go up by what seems to me high amounts. Has anyone got any advice on how high can the PSI of tyres go when they get hot? And is there a hot PSI that is simply too high?

3. Last question is that the manufacturers date is 13th week of 2018. They’ve only done 9000 miles and have 6mm on the front and 7mm on the back. I am looking at going up to 225/70 R15 112R from 215/70 R15 109R at some stage. Do funsters look at the manufacturers date, or just go by the tread depth?

Thanks very much.

 

[Jev88]

Tyres. 7 years, get changed, tread irrelevant.

Tyre pal recommend temperature and pressure alarms set to XX percentage - see booklet. Yes they do go up in temperature and pressure quite a bit in motion.

Pressure, I use www.tyresafe.org

 

[Hettie's Crew]

1 - It doesn’t matter what us Funsters think, if that’s what Continental say.
2 - I had this when I had 215/70 15’s and it concerned me too.
3 - When I checked with Continental they said up to 10 years old was fine but check more regularly after 5 years for cracking.
I changed to 225/70 15’s and the temperature / pressure changes reduced significantly on the Tyre Pal.

 

[pappajohn]

Tyres degrade with age, just like cambelts.
Even a tyre kept in storage and never fitted will degrade with age.
Five years is recommended for van tyres regardless of tread wear, car tyres can be higher.

 

[spikehcm681]

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[Wabs]

Some cracking can’t been seen around the bead,ask me how I know,,change after 5 years irrespective of wear/ tread,, big risk to take for the money involved.

 

[DDJC]

Motorhome Tyre Pressure Calculator | TyreSafe

Our motorhome tyre pressure calculator gives you the correct pressures for your motorhome. Check your tyres regularly for your safety.

www.tyresafe.org

Crikey that says 80psi / 5.5 bar on the rear tyres !!

The tyre says max cold is 69 psi, but if on a campervan that can go up to 5.5bar / 80 psi

So, I've gotta go with Continental who say 5 bar / 72 psi. They made the tyre, surely they know what their tyres can do!

 

[Wabs]

Continental could make bicycle tyres,, they’d still say 5.5bar

 

[DDJC]

Tyres. 7 years, get changed, tread irrelevant.

Tyre pal recommend temperature and pressure alarms set to XX percentage - see booklet. Yes they do go up in temperature and pressure quite a bit in motion.

Pressure, I use www.tyresafe.org

Thanks for this. I downloaded the booklet.

Tyrepal recommend a High Pressure setting of 25% ABOVE the cold PSI and 15% LOWER than the cold PSI for the Low Pressure setting. Max temperature should be set to 70 deg c