Tyre pressures?
Author
Discussion

Ray Singh

Original Poster:

3,084 posts

261 months

Wednesday 7th April 2010
quotequote all
How do you know what pressure to fill your car tyre up too?

Strange question, but i have just returned from having new tyres fitted to my car. the garage that replaced them showed me work inside and outside edges. "These were under inflated mate".
"But i filled them to what is quoted on the inside of the fuel filler cap" i said.
"Dont go by them mate, its 38psi all round".

On the way out, i asked the boss at the cash desk about what pressures to fill these to. He responded with 32 psi all round....

What do i fill these up to? Tyres in question are Pirelli P6000. 205/55/R16 (ditch finders I know!!).


sleep envy

62,260 posts

280 months

Wednesday 7th April 2010
quotequote all
are you checking the pressures hot or cold?

Ray Singh

Original Poster:

3,084 posts

261 months

Wednesday 7th April 2010
quotequote all
sleep envy said:
are you checking the pressures hot or cold?
cold.

Ray Singh

Original Poster:

3,084 posts

261 months

Wednesday 7th April 2010
quotequote all
doogz said:
Go with what it says in the manual/on the plate on the car. And check them regularly to make sure they're correct, and not soft.

And don't listen to the tyre monkey.

What sort of car is it? Because 38psi seems rather high for most things.
Its a VW touran tdi on a 04 plate.

Fastra

4,289 posts

240 months

Wednesday 7th April 2010
quotequote all
I go off the manual I got with the car.
For my tyre size (205/50 x16) 32 front & 29 rear and do them cold.

MX7

7,902 posts

205 months

Wednesday 7th April 2010
quotequote all
I'd say 38 is too high. I've seen it suggested that part of the reason for 'standard' pressures is that it gives a comfortable ride. Adding a few more psi over standard does seem to make most cars drive slightly better in my opinion.

Fastra

4,289 posts

240 months

Wednesday 7th April 2010
quotequote all
Ray Singh said:
doogz said:
Go with what it says in the manual/on the plate on the car. And check them regularly to make sure they're correct, and not soft.

And don't listen to the tyre monkey.

What sort of car is it? Because 38psi seems rather high for most things.
Its a VW touran tdi on a 04 plate.
According to this:

http://www.thetyrepressuremonitor.com/locate.asp?a...

...you should be doing 34 all round.

Simbu

1,916 posts

205 months

Wednesday 7th April 2010
quotequote all
It makes the steering lighter because there's less rubber in contact with the road. This reduces friction and the effort you need to steer. The obvious flipside is a reduced surface area reduces grip as less rubber is touching the road.

I'd always go by the manufacturer's recommendations - the car has been designed to handle with those pressures in mind.

mcflurry

9,192 posts

284 months

Wednesday 7th April 2010
quotequote all
Simbu said:
I'd always go by the manufacturer's recommendations - the car has been designed to handle with those pressures in mind.
I would too, if the garage air gauges weren't so inaccurate. Last week I put in 34 psi all round, now it reckons I have 38 psi in there confused


dylan0451

1,040 posts

222 months

Wednesday 7th April 2010
quotequote all
whats the load rating? maybe they quoted you higher pressures because its a van/mpv and capable of taking quite a payload

in contrast, i'm dropping pressures into the 20's, but that's only because my max payload is a weeks shopping for 2 and a passenger

iirc my mates trailer tyres inflate to something like 80psi max, and are run at 50-60 something like that, but it weighs 1.5 tonne and is setup to carry something like 3