What tire presssures do you run?

[rafcom]

Hi All

As per usual, the internet is full of very contrasting figures when it comes to tire pressures, so how about, what is your ...

Tire size?
Pressure?
Use? (posing, commuting, canyons, track etc.)

Standard spec just seems way too high, and I've been told as much from a tire fitment place, but what do I know

 

[AnubisZed]

You'd imagine that a company that spans decades of knowledge in car manufacturing for road and track use just might know a bit more than a tyre monkey that's been taught how to fit a tyre!

And "way too high"?? I see them as typical with other cars I've owned, so no concern at all here with the spec plate pressures

 

[rafcom]

Yeah I get that, they didn't have to study to become tire fitters, but they do have something we "normal" people don't, a lot more tires under the belt.

And someone here once said something which seemed logical, those tire "specs" were based on tires from over a decade and a half ago and things have moved on since, so are they still relevant?

Personally, I dunno, I can see the logic behind both sides, which means what I lack is experience/data.

 

[Pondy]

You'd imagine that a company that spans decades of knowledge in car manufacturing for road and track use just might know a bit more than a tyre monkey that's been taught how to fit a tyre!

And "way too high"?? I see them as typical with other cars I've owned, so no concern at all here with the spec plate pressures

Absolutely agree.
There is SO much discussion about tyre pressures on car forums (this one is no exception). You would be forgiven for thinking many people are race engineers for F1 teams given the amount of knowledge they seem to have on the subject.

As said; the car manufacturers calculate the recommended pressures from many parameters, which they know far better than anyone else, so who are we to say we know better?

So my answer to the question is whatever it says on the label stuck on the car, for a given size.

 

[Busterboo]

What it say on the label at the bottom of the B pillar.

Then check them with a Draper dial gauge and so on monthly.

Find recommended pressures, although seemingly high, work well.

 

[rafcom]

So 225/35-19 @ 2.4 bar and 255/30-19 @ 2.8 bar

My profiles are 1 size up back and front, but presumably the pressure stays the same because pressure is what holds the weight and not volume (sort of).

 

[MarshMA10]

Pressure is presumably supplemented / altered by sidewall stiffness though, so can’t just assume….

I stick to manufacturers advice then adjust 1-2 psi either side until I find something I like. On motorbikes it’s much more common to deviate from manufacturer advice and the difference is HUGE so you become much more sensitive to it.

One thing I find odd on this subject is how few of us own a device to inflate our tyres at home. For the last 15 years I’ve more or less always used garage forecourts!!!

 

[Pondy]

One thing I find odd on this subject is how few of us own a device to inflate our tyres at home. For the last 15 years I’ve more or less always used garage forecourts!!!

I have three! And they all read differently for a given pressure.
Unless you have a calibrated gauge it's all estimated guesses, so discussing the finer points of 1 or 2 psig is a waste of time IMO. Pressures alter constantly inside a tyre, depending on a myriad of factors (not least the weather).

Bikes are different, as their tyre profiles are nothing like a car.

 

[jenniferlouise]

I’m a stickler for following manufacturers numbers, however I assume that those pressures were set for the OE tyre set (usually one or two makes) and on RFTs…?

I’ve stuck with the stickers’ pressures and it runs just fine, but did wonder if it would be happier on a little more or less.

Oh, and you’ll of course know already that police will take tyre pressure readings at the scene of a collision as a matter of basic evidence gathering. So if you’re miles off manufacturer ratings there may be some uncomfortable questions with your insurer. Just saying…

 

[matsmith749]

While it's possible for police to take tyre pressure readings (maybe if it's a huge / deadly collision) - it's not always.

I've had 3x collisions, I car, 2 bikes. Injuries in all 3, with court action in 2.

No tryre pressures taken or given in evidence.

But anyways, I think you are much more likely to run into problems running standard tyres instead of runflats if manufacturer recommendations were anything to do with the law

As for tyre pressure itself - if on runflats I would stick to roughly what the sticker says. I'm actually on non-runflats, so there is no manufacturer info to go on.

I run 38 rear, 34 front & it seems ok.

 

[B21]

So 225/35-19 @ 2.4 bar and 255/30-19 @ 2.8 bar

My profiles are 1 size up back and front, but presumably the pressure stays the same because pressure is what holds the weight and not volume (sort of).

So what make, type and model of tyres are you using?..I assume not the standard run flats…?

 

[Pondy]

I've had 3x collisions, I car, 2 bikes. Injuries in all 3, with court action in 2.

I won't ask for your advice then! :lol: :lol:

 

[flybobbie]

23i 18 inch GY Asy 5's xl.
40 psi all around and get even wear across the tread.
I'm happy with that.
I ignore the plate as non std. tyres and not the tyres supplied as new with probably 18 year old tech tyres.

 

[rafcom]

So 225/35-19 @ 2.4 bar and 255/30-19 @ 2.8 bar

My profiles are 1 size up back and front, but presumably the pressure stays the same because pressure is what holds the weight and not volume (sort of).

So what make, type and model of tyres are you using?..I assume not the standard run flats…?

I run non RFTs ...
Front: Falken FK520 225/40-19 Rear: Accelera PHI R 255/35-19

Will switch the rears to FK520s early next year as well.

I went up 1 size on the rears due to emergency repair, but decided to do that all round just for a smidge more "cushioning".

 

[B21]

So 225/35-19 @ 2.4 bar and 255/30-19 @ 2.8 bar

My profiles are 1 size up back and front, but presumably the pressure stays the same because pressure is what holds the weight and not volume (sort of).

So what make, type and model of tyres are you using?..I assume not the standard run flats…?

I run non RFTs ...
Front: Falken FK520 225/40-19 Rear: Accelera PHI R 255/35-19

Will switch the rears to FK520s early next year as well.

I went up 1 size on the rears due to emergency repair, but decided to do that all round just for a smidge more "cushioning".

With those tyres I won’t proffer any advice

 

[jenniferlouise]

I've had 3x collisions, I car, 2 bikes. Injuries in all 3, with court action in 2.

No tryre pressures taken or given in evidence.

But anyways, I think you are much more likely to run into problems running standard tyres instead of runflats if manufacturer recommendations were anything to do with the law

It’s just a view…