Tire pressure

[driveace]

Well 1 bar =14 lbs per sq in .In motorsport a lot of competitors use filtered air ,or hydrogen,so the pressures are more stable as the temperature of the tyre increases,and they can rise quite a lot.I always run higher pressure on front wheel drive cars in the front tyres,so maybe 35/37 in front 30 in rear,on my Fiesta diesel.And 4 wheel drive Sorento is 35 all round,45 when towing caravan.and rear wheel drive Merc 30 front 34 rear.But its over 50 years since I was fitting over 20 tyres a day,and then radial tyres were only just coming onto the market ,so all tyres were cross ply,s

[Mark]

Heat in tyres produces wear. You don't want hot tyres in a road car.

[schmenke]

....In motorsport a lot of competitors use ...hydrogen...

You mean nitrogen?

[driveace]

and under inflated tyres get very hot .The guy who said he inflates his tyres to just below the pressure on the side wall is not well informed as the pressure on the side wall is the very Maximum pressure the tyre is designed to run at,and not the recommended pressure for the vehicle the tyres are on.The pressure on most car tyre sidewalls willusually be about 65lbs per sq in

[driveace]

You mean nitrogen?

Correct I am tired again !

[ioan]

Correct I am tired again !

Too many tires?

[wedge]

I usually go up a couple of PSI as I personally like sidewalls stiffened but not too stiff that it dramatically affects the slip angle.

On my dad's workhorse he goes up a couple of PSI, too.

[Zico]

I generally go up a couple of PSI in the summer too, makes the steering a bit more responsive and improves mpg a tad.

Re- lowering tyre pressures, I 100% agree that in normal conditions its certainly not desirable for many reasons.... however there are occasional road conditions (Winter- very slippy, wet, slimy, salt covered roads only) where lowering the tyres by around 3-4 PSI can make the car less edgy/nervous, give much more feedback of the available grip due to there being more sidewall roll and larger tyre contact patch lets you put the power down a bit better and makes acceleration/cornering grip a bit more progressive when grip levels are limited even beyond wet conditions.
Some of you may dissagree and that may be true of your car/tyres combo.. all I can say is that it certainly improved things with the old Pug GTI/Pirelli P700z ditch-finders.

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