Tyre Pressures

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IslandBlue
Posts: 287
Joined: Wed Nov 27, 2013 1:58 pm
Location: Mid Sussex

Tyre Pressures

Post by IslandBlue »

My modern car is doing my head in with its tyre pressures, not just the slow puncture courtesy of our rotten roads but the variability of different measuring devices:

1. The onboard monitoring system
2. My Halfords digital pressure gauge (nifty gadget with a digital tread gauge too: https://www.halfords.com/tools/garage-e ... 39116.html )
3. Ring electric pump
4. Large bicycle pump

These all give different readings and I wonder which is most trustworthy? I'd tend to take 3 & 4 with a pinch of salt but both 1 & 2 read psi to one decimal place. Helpfully the Halfords specification doesn't include any accuracy range :roll: but how accurate are these on board monitors? (Car is a Bini btw.)

To cap it all I had the car serviced today and they've obviously topped up the pressures but either they didn't check the manual or their gauge reads rather low as the on board monitor is now reading about 4-5 psi higher than when I dropped it off this morning!
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Rolandino
Posts: 253
Joined: Sat Oct 22, 2016 11:37 pm
Location: Wokingham, Berkshire

Re: Tyre Pressures

Post by Rolandino »

Hi,

I use a Venhill Tyre pressure gauge, see it at https://www.demon-tweeks.com/uk/venhill ... i-vhpvt32/

Whenever I go o a Mini7 race meeting and the Dunlop truck is there (and I remember to bring the gauge with me) , I get the pressure gauge checked. Its never been wrong!
IslandBlue
Posts: 287
Joined: Wed Nov 27, 2013 1:58 pm
Location: Mid Sussex

Re: Tyre Pressures

Post by IslandBlue »

Thanks, that looks like something to add to my birthday present list!
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Spider
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Location: Big Red, Australia

Re: Tyre Pressures

Post by Spider »

I'd suggest using the gauge that gives the most consistent readings, observing your tyres over time for they way they wear and maintaining that pressure as according to your repeatable gauge. The value of the numbers don't matter so much as achieving the same number each time.

I'm sure you are aware, but just to be sure that base is covered, the tyre pressures will vary with temperature, both ambient (only by a small amount) but more so from being driven.

They are all somewhat cheap and never the most accurately calibrated items. If you really wanted the scale to read correctly, you could send it off for calibration, though, that'll likely cost 5 times what you would have paid for the gauge.
floormanager
Posts: 308
Joined: Thu Feb 19, 2015 10:16 pm
Location: West Sussex

Re: Tyre Pressures

Post by floormanager »

Best gauge I've found is an oldie but goldie
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IslandBlue
Posts: 287
Joined: Wed Nov 27, 2013 1:58 pm
Location: Mid Sussex

Re: Tyre Pressures

Post by IslandBlue »

Spider wrote: Wed Feb 24, 2021 7:39 pm I'd suggest using the gauge that gives the most consistent readings, observing your tyres over time for they way they wear and maintaining that pressure as according to your repeatable gauge. The value of the numbers don't matter so much as achieving the same number each time.

I'm sure you are aware, but just to be sure that base is covered, the tyre pressures will vary with temperature, both ambient (only by a small amount) but more so from being driven.

They are all somewhat cheap and never the most accurately calibrated items. If you really wanted the scale to read correctly, you could send it off for calibration, though, that'll likely cost 5 times what you would have paid for the gauge.
I've probably bigged up my confusion to be honest topped off by the garage adding to the mix but whether that's because their gauge is wrong or they were working to the wrong data I don't know (although it's all on a sticker in the door shut!) which reminds me I must let some air out of the tyres now.

I was aware of the temperature variation and with the on board monitoring it is possible to see how the pressures rise as the tyres warm up, but as you say the main thing is that the wear is even which it pretty much is so I've not been far off so far.
IslandBlue
Posts: 287
Joined: Wed Nov 27, 2013 1:58 pm
Location: Mid Sussex

Re: Tyre Pressures

Post by IslandBlue »

floormanager wrote: Wed Feb 24, 2021 8:05 pm Best gauge I've found is an oldie but goldie
Ah yes, my dad used to have one of them although he'd lost the lid and the end of the tube was all bent so you had to shake it to get the thing out!
floormanager
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Location: West Sussex

Re: Tyre Pressures

Post by floormanager »

IslandBlue wrote: Wed Feb 24, 2021 8:19 pm
Ah yes, my dad used to have one of them although he'd lost the lid and the end of the tube was all bent so you had to shake it to get the thing out!
Ditto, my Dad also. Perhaps they were given away when they left school?? :D
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Andrew1967
Posts: 6382
Joined: Thu Jun 24, 2010 6:35 pm
Location: Usually in my garage on the east coast of Norfolk, UK

Re: Tyre Pressures

Post by Andrew1967 »

My Dad is the same. Always checks tyres with one of those and swears they are more accurate.

The problem with garage ones is that they get chucked on the floor which messes up the calibration.
Polarsilver
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Joined: Fri Jan 15, 2016 1:22 pm
Location: Silverstone not far away

Re: Tyre Pressures

Post by Polarsilver »

Go Period ..Just give the Tyres a "Kicking" .. works for me ;)
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