Rookie error - tyre pressure

[kev54]

We left Newhaven in the cold (near 1°C) back in mid-March, having checked the tyre pressure per the instruction manual. Happily pootled 1,500 miles through France, Spain and Portugal, complaining regularly about the lumps and bumps in Spanish motorways. Arrived near Granada in the 40°C heatwave. Only then did I casually think - “maybe I’ll check the tyres, it’s been a while…”

What had been 5/5.5 Bar back at 1°C had turned into something waaay above 6.5!

And the annoying thing is that I’m not exactly a rookie!

Anyhow, unsurprisingly, the Spanish motorways have improved immensely since then. (I do also check the pressure every other fuel-fill, like a grown-up)

 

[kev54]

Apologies, this should probably be in Chat not Questions - but I am a rookie at this part of it!

 

[bigtwin]

5.5bar is very high, that’s 80psi!

What’s your rear axle weight?

Ian

 

[dunnah01]

Tons of tyre pressure threads but nobody knows what a cold tyre temperature is

 

[dunnah01]

5.5bar is very high, that’s 80psi!

What’s your rear axle weight?

Ian

Sweepstake on whether they're Michellin Agilis CPs

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[kev54]

5.5bar is very high, that’s 80psi!

What’s your rear axle weight?

Ian

MTPLM 3300 Kg. The badge on the door says 5 front, 5.5 rear. Now I’m discovering how much of a rookie I really am! Now it’s a question

 

[kev54]

Sweepstake on whether they're Michellin Agilis CPs

Continental Campers - came with the van

 

[Tigger-Tim]

Continental Campers - came with the van

I'd recommend putting the (loaded) van on a weighbridge and getting front/rear weights. Continental gave me recommendations much lower than 5.5 bar. The van runs a lot more smoothly now.

 

[dunnah01]

Continental Campers - came with the van

Darn it - I lose 1p. Continental will let you go way lower than 5.5bar

 

[bigtwin]

MTPLM 3300 Kg. The badge on the door says 5 front, 5.5 rear. Now I’m discovering how much of a rookie I really am! Now it’s a question

If you input the following information in the TyreSafe website, you’ll get the correct pressures for your van:

1. Front Axle Weight (as weighed on a weigh bridge)
2. Rear Axle Weight (as weighed on a weigh bridge)
3. Tyre size and load index

Please note that if you input the maximum plated axle weights instead of your actual weights then you will still be running slightly overpressure.

It’s likely that you should be running a lot closer to 4 bar/60 psi.

Ian

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[Googlebot]

I use Tyrepal, tells me the pressures all the time and saved me when I was about to cross the Channel. Worth every penny!

 

[Raul]

We left Newhaven in the cold (near 1°C) back in mid-March, having checked the tyre pressure per the instruction manual. Happily pootled 1,500 miles through France, Spain and Portugal, complaining regularly about the lumps and bumps in Spanish motorways. Arrived near Granada in the 40°C heatwave. Only then did I casually think - “maybe I’ll check the tyres, it’s been a while…”

What had been 5/5.5 Bar back at 1°C had turned into something waaay above 6.5!

And the annoying thing is that I’m not exactly a rookie!

Anyhow, unsurprisingly, the Spanish motorways have improved immensely since then. (I do also check the pressure every other fuel-fill, like a grown-up)

Surely those temperatures were not today.

 

[bigwood]

As a matter of interest I put our Transit coachbuild on the weigh bridge because I thought the ride was a bit harsh.
The Continental chart said 60 psi rear, 50 psi front as they are. I will have to live with the ride but it showed we are a lot under our weight capacity with a full fuel tank water tank and two up. Even muttly and his grub will give management packing room.

 

[Just smiffy]

This’ll help…

 

[bigtwin]

This’ll help…

View attachment 754590

Those seem like quite high axle weights. Nonetheless the table is handy reference though.

Ian

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[Just smiffy]

Those seem like quite high axle weights. Nonetheless the table is handy reference though.

Ian

They were for a previous van and owner but the chart still gives good advice…

 

[kev54]

Surely those temperatures were not today.

Granada was 12 days ago

 

[SpitzTM]

If you input the following information in the TyreSafe website, you’ll get the correct pressures for your van:

1. Front Axle Weight (as weighed on a weigh bridge)
2. Rear Axle Weight (as weighed on a weigh bridge)
3. Tyre size and load index

Please note that if you input the maximum plated axle weights instead of your actual weights then you will still be running slightly overpressure.

It’s likely that you should be running a lot closer to 4 bar/60 psi.

Ian

Out of curiosity I put the details into Tyresafe for our Benimar (Fiat maxi chassis, 1850kg front axle, 2000kg rear with 225/75 R16 CP 116 Agilis tyres) and while it came back at 80psi for the rears (which is what I have them at) it recommended only 55 psi for the fronts. Has anyone else followed a recommendation like this? And if so, did they see an improvement in ride quality?

Apologies for hijacking the thread.

 

[bigtwin]

Out of curiosity I put the details into Tyresafe for our Benimar (Fiat maxi chassis, 1850kg front axle, 2000kg rear with 225/75 R16 CP 116 Agilis tyres) and while it came back at 80psi for the rears (which is what I have them at) it recommended only 55 psi for the fronts. Has anyone else followed a recommendation like this? And if so, did they see an improvement in ride quality?

Apologies for hijacking the thread.

That’s pretty much what I run my fronts at.

Ian

 

[bladerunner]

I always struggle to get mine to 100%!