Tyre Pressures

[Merlin]

Yup. Echoing everyone else, 32 PSI when cold all round.

[DaveyBa8]

To low of pressure will wear the outsides more as to high a pressure will wear the middle, considering that I still run 30 psi when cold, I prefer the extra traction and road handling.

[Merlin]

I always say cold as I talk about hot pressures a lot. I set my semi slicks to 25 cold and they get up to 34-35 hot, but they have very stiff sidewalls. 32 PSI cold for road driving on road tyres.

To low of pressure will wear the outsides more as to high a pressure will wear the middle, considering that I still run 30 psi when cold, I prefer the extra traction and road handling.

Running a lower PSI will reduce the rigidity of the tyre resulting in more tyre movement and body roll, reducing road handling.

[Dbo]

To low of pressure will wear the outsides more as to high a pressure will wear the middle, considering that I still run 30 psi when cold, I prefer the extra traction and road handling.

if your tacking is true then underinflation will cause inside and outside edges to wear as the tyre will splay, inside tyre wear indicates toe out on the camber and outside wear toe in on camber as overinflation will wear the middle.
size of tyre is irrelevent as 32psi in a larger tyre is just more air than in a smaller tyre to fill the air space required
running low pressure gives you more friction to the road surface and more friction just means more fuel, tyre wear and speed loss = more cost
only tyres that need overinflation are if they are being put under weight load, eg little 10" tyres on trailers can run upto 60psi to carry loads.
have even fitted some commercial supersingles on hgv's that only require 32psi when trailer was empty

[DaveyBa8]

I always say cold as I talk about hot pressures a lot. I set my semi slicks to 25 cold and they get up to 34-35 hot, but they have very stiff sidewalls. 32 PSI cold for road driving on road tyres.

To low of pressure will wear the outsides more as to high a pressure will wear the middle, considering that I still run 30 psi when cold, I prefer the extra traction and road handling.

Running a lower PSI will reduce the rigidity of the tyre resulting in more tyre movement and body roll, reducing road handling.

I don't think 30 psi when cold will ruin any kind of handlen but for ME it gives a better steering response on the road, the higher the pressure the harder the tire, I prefer a softer tyre, I'm not talking huge profile tyres and being badly under inflated, I feel more of the road and better response.

[DaveyBa8]

To low of pressure will wear the outsides more as to high a pressure will wear the middle, considering that I still run 30 psi when cold, I prefer the extra traction and road handling.

if your tacking is true then underinflation will cause inside and outside edges to wear as the tyre will splay, inside tyre wear indicates toe out on the camber and outside wear toe in on camber as overinflation will wear the middle.
size of tyre is irrelevent as 32psi in a larger tyre is just more air than in a smaller tyre to fill the air space required
running low pressure gives you more friction to the road surface and more friction just means more fuel, tyre wear and speed loss = more cost
only tyres that need overinflation are if they are being put under weight load, eg little 10" tyres on trailers can run upto 60psi to carry loads.
have even fitted some commercial supersingles on hgv's that only require 32psi when trailer was empty

Ok? You just explained more on what I already said?

[Dbo]

no i didn't i explained that you running 30psi means you have splayed out sidewalls, that increases the risk of them giving out, you are causing more friction that means your engine has to push harder to overcome. you are using more fuel to achive this and putting your steering rack under a heavy load to turn.
your steering would not feel more positive in fact the oppisite it would feel heavier but that just tells me you must like heavy steering and the feedback you get from it so that is easy fix delete your power steering and blow your tyres up

[DaveyBa8]

no i didn't i explained that you running 30psi means you have splayed out sidewalls, that increases the risk of them giving out, you are causing more friction that means your engine has to push harder to overcome. you are using more fuel to achive this and putting your steering rack under a heavy load to turn.
your steering would not feel more positive in fact the oppisite it would feel heavier but that just tells me you must like heavy steering and the feedback you get from it so that is easy fix delete your power steering and blow your tyres up

I'll blow them baby's right up hate light steering, but I still really don't see how 30psi when cold is going to do any damage at all, I've never had an issue, its also better for getting away in first if your bothered with drag racing.

30psi is what I will always run, its an all round happy medium for me, softer tyre, better feel, tighter steering, feels a lot better on the corners, 32psi is for people who are worried about manufactures mpg figures

[Dbo]

i am just glad i am not in your lude then
it is not just an mpg thing it is also a safty thing softer feel is achived with better suspension and a softer tyre compound in the rubber, tighter steering is achieved with strut bars and drag racing pull aways on low tyre pressure will result in splitting the engine mounts so i would get polybushed ones if i were you

in drag racing i thought the idea was to reduce as much weight and friction as possible never thought of achieving this by reducing the weight of air a lude carried wonder if i can reduce my 20 stone frame by holding my breath and sucking the air out of the cab and driving in a vacuem only joking

[judderod]

I run 34 - 36 psi on 205/55/15's because it handles better and feels sharper on my setup, and it's about the highest I can go without extra wear. Plus as said it gives better MPG. Win win.