tyre pressure question

marking_bad

Will kicking the tyres do?

LilacPixie

weekly with a digital handheld gauge thingy. My OH on the other hand never ever checks them, drives me nuts.

focae

ailuro2 wrote: »

Check them once a week with a plug in gauge.

If they need filling then do it next time you're at the garage. Beware their gauges are notorious for not being accurate

What makes you think your own gauge is any more accurate? You think you can spend a few quid and have a gauge that is accurate to half a gnats wotsit?

Bet if you compared a dozen gauges, whether they be garage or personal, I doubt you will get many that show the true reading. You may get lucky and get one that is correct at one pressure but I bet it will be wrong at others. Even then, they will probably vary with ambient temperature as well.

And don't be fooled into thinking that the digital ones are any better. They may show the pressure to resolutions of tenths of a PSI but in reality they are no more accurate.

thescouselander

vikingaero wrote: »

You should try checking your tyre pressures when the daytime temperature is in the teens and the nighttime air temperature is near freezing.

Yes but thats getting a bit silly. If you take that approach you'd need to adjust your tyre pressures continuously as the atmospheric pressure and ambient temperature changes though out the day.

A quick check once a month in the morning before going out works fine in my experience - I usually only see differences of about 1 psi from what the tyres should be at.

Here's another thing though. I do think smaller tyres lose pressure faster because they have less volume of air in them. My pushbike tyres need topping up every week and lose about 10 psi. It might be that you can get away with checking your tyres for longer if you have big tyres..

badabing

Anyone know what the correct tyre pressure should be for 225/40 r18 ?

It says in the manual 36 psi for front and 42 psi in back when fully loaded...(not me but the car):beer:

32 and 35 when 3 people.

I have checked various place and all seem to differ !!:j

Thanks

Problem solved....33 front and 30 rear...

vikingaero

thescouselander wrote: »

Yes but thats getting a bit silly. If you take that approach you'd need to adjust your tyre pressures continuously as the atmospheric pressure and ambient temperature changes though out the day.

OK it can be extreme, but on some cars you can find significant differences of 3-4 psi. Some manufacturers not only stipulate inflation from cold, but some go further and stipulate inflation at 0 degrees C. As ambient temperature increases then so will the tyre pressure, but you should never reduce tyre pressures which have been correctly inflated from cold.