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Author Tyre pressures
Sam
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7th Nov 11 at 13:47   View User's Profile U2U Member Reply With Quote
I took my car to my local tyre place this morning because I kept losing air in one tyre (they said it had a "rim leak").

Anyways, I noticed he inflated that tyre to 35 PSI (they are 215/50/16 tyres) but the others were 28-29 PSI so I inflated them all to 35 PSI.

Steering seems much lighter now and they don't look like they are sagging much any more, but I'm wondering is it OK to over-inflate these tyres or should I drop them back down to 30 PSI (which is what I normally inflate them to)?
Daveskater
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7th Nov 11 at 13:49   View Garage View User's Profile U2U Member Reply With Quote
Depends on what the car's handbook says. If the tyres are over-inflated too much then you'll wear the middle of the tread out.

Numberwang!

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Sam
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7th Nov 11 at 13:50   View User's Profile U2U Member Reply With Quote
Handbook says 29 PSI for the front and 31 PSI for the back.

In snowy weather like beginning of this year I also drop them down to about 25 PSI for better grip on the road

[Edited on 07-11-2011 by Sam]
Ronson
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7th Nov 11 at 13:52   View User's Profile U2U Member Reply With Quote
Drop them to 30 PSI if the handbook says that.
gez bay
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7th Nov 11 at 13:52   View User's Profile U2U Member Reply With Quote
if they are over inflated, you should see the middle of the tyre wear first.
Ronson
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7th Nov 11 at 13:56   View User's Profile U2U Member Reply With Quote
Echo

quote:
Originally posted by Daveskater
Depends on what the car's handbook says. If the tyres are over-inflated too much then you'll wear the middle of the tread out.


Echo

quote:
Originally posted by gez bay
if they are over inflated, you should see the middle of the tyre wear first.


Echo
FAZ
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7th Nov 11 at 13:57   View Garage View User's Profile U2U Member Reply With Quote
i run 28 allround
Sam
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7th Nov 11 at 14:02   View User's Profile U2U Member Reply With Quote
One other question - as I've driven the car before inflating the tyres, won't the tyres be less than 35 PSI now that they are cold (and not driven for about 4 hours I reckon)?

Or is this just some Internet myth?
gez bay
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7th Nov 11 at 14:03   View User's Profile U2U Member Reply With Quote
wouldnt worry about that, some serious science stuff that. just leave them down to where they should be
FlaFFy_91
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7th Nov 11 at 14:26   View Garage View User's Profile U2U Member Reply With Quote
i Run 36 all around on mine as they are stretched and im always scared of them popping off round a corner haha
Ben G
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7th Nov 11 at 15:14   View User's Profile U2U Member Reply With Quote
always done 32 all round on my cars, never had a problem with wear in the middle. but then it varies with each car.
Sam
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7th Nov 11 at 16:14   View User's Profile U2U Member Reply With Quote
OK they are now running on 31/front and 33/back (handbook says 29/31 but I thought a couple of extra PSI would be OK).
John
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7th Nov 11 at 16:16   View User's Profile U2U Member Reply With Quote
Why not just go with what the handbook says?
Sam
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7th Nov 11 at 16:19   View User's Profile U2U Member Reply With Quote
Car is usually loaded up with stuff and most of the time (on the few occasions I do drive) I go long distances.
Dan295
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7th Nov 11 at 16:25   View User's Profile U2U Member Reply With Quote
handbook and tyre wear police

when i commute long distance my tyres are like 40psi. that was on 15's. you wont notice much difference on 16's really. so long as you hit the brakes and it doesnt lock up its fine
Robin
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7th Nov 11 at 16:28   View Garage View User's Profile U2U Member Reply With Quote
5PSI drop for snow will make no difference Sam, not worth the hassle
John
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7th Nov 11 at 16:28   View User's Profile U2U Member Reply With Quote
Apart from the uneven wear and dodgy handling?

That was to Dan, not Robin.

[Edited on 07-11-2011 by John]
sc0ott
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7th Nov 11 at 16:38   View User's Profile U2U Member Reply With Quote
Does the tyre wall not mention the psi limit?
Sam
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7th Nov 11 at 16:40   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Robin
5PSI drop for snow will make no difference Sam, not worth the hassle


I beg to differ - in my case, traction was much improved from what I remember.

The auto box and heavy V6 engine probably helps as well TBH
Sam
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7th Nov 11 at 16:40   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by sc0ott
Does the tyre wall not mention the psi limit?


Yeah something like 50 PSI or whatever but I've never run tyres at such a high pressure
Dan295
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7th Nov 11 at 16:41   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by John
Apart from the uneven wear and dodgy handling?

That was to Dan, not Robin.

[Edited on 07-11-2011 by John]


so to clarify, 16's being over-inflated by 6-7 psi will wear out his tyres instantly, or worse he wont be able to turn out the end of his road?
John
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7th Nov 11 at 16:43   View User's Profile U2U Member Reply With Quote
No, you driving at 40psi would wear the centre of the tyre pretty quickly though and handling would definitely be adversely affected.

I'm not saying you'll instantly die but your brakes not locking up isn't really a test for if it's fine or not.
Robin
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7th Nov 11 at 16:47   View Garage View User's Profile U2U Member Reply With Quote
It's a proven fact that overinflated tyres will wear quicker in the centre. Overinflated tyres will also affect steering input (if on the front) and have horrible effects on oversteer (lift off or otherwise, on the rear)

Underinflated tyres will wear quicker on the outer edges and make the steering sluggish and heavy, as well as knackering your fuel consumption and ability to dissipate rainwater.

There is no argunment here, that's all fact.

Nothing will cause them to wear out instantly or cause immediate death, not even inflating them to 80psi... but it will upset the behaiviour of the car.
Dan295
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7th Nov 11 at 16:51   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by John
No, you driving at 40psi would wear the centre of the tyre pretty quickly though and handling would definitely be adversely affected.

I'm not saying you'll instantly die but your brakes not locking up isn't really a test for if it's fine or not.


agreed it will upset the behaviour, but 6-7 psi will make fuck all difference to tyre wear and will make a minimal difference to steering and braking.

in real conditions hit the brakes hard and if it skids its probably overinflated. (in this situation)

[Edited on 07-11-2011 by Dan295]
johnhara1
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7th Nov 11 at 16:52   View User's Profile U2U Member Reply With Quote
mate of mine pumped his up with an airline at his work with no gauge on it

drove the car and it was impossible to keep steady, i made him go the nearest petrol station so we could see the pressures.

1 of them was around 60psi, the rest between 50 and 55

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