19" wheels tyre pressures?

[Flying Penguin]

Just got PS4S fitted all round (235/35/19 & 265/30/19).

Tyre shop recommended 30psi+
Decided on 24 front/ 26 rear, based on a long (& mainly inconclusive) PH research. The car is 4.0 & Nitrons; no track use.

What pressures do you gents use with 19" wheels?

[JonChalk]

Flying Penguin said:

Just got PS4S fitted all round (235/35/19 & 265/30/19).

Tyre shop recommended 30psi+
Decided on 24 front/ 26 rear, based on a long (& mainly inconclusive) PH research. The car is 4.0 & Nitrons; no track use.

What pressures do you gents use with 19" wheels?

Seems a bit low tbh; 255/35r19s PS4Ss on my S5 run at between 34 to 42, depending on front/rear, heavy load or not.

Granted, your TVR is about half the weight though.

[mk1fan]

TVR are pretty consistant on tyre psi from the Wedge through to the Sag at around 24psi even with differing tyre and wheel sizes.

I suggest going with the factory level for the 18s and adjust if they feel wrong. 30psi seems (to me) way to high unless you have super soft load rated 25/30 profile tyres!

[tofts]

Any more than 26psi makes the car feel very VERY nervous and quite a chore to drive. DO NOT put more than this in. Generally 24psi all round (cold) is a good start point and adjust as necessary to get even heat distribution across the tire.

[fredd1e]

Running the same 24/26psi combo on my PS4S 19" rimmed T350C. I use a 255x30/19 rear and 225x35/19 sizes as clearance is limited with the T350C arches front and rear. I'm tempted to go to 28psi on the rear.

[Flying Penguin]

fredd1e said:

I'm tempted to go to 28psi on the rear.

Pls explain?

[Speed 3]

I have 18" and don't go any higher than 22 psi. With the lower load index tyres now unavailable I'd be tempted lower rather than higher. I have Pilot Super Sports on the rears and PS3's on the front. I played with increments of 2psi down from 28 until I felt the car "right". 22-23 seemed to be the sweet spot. Not sure now much one inch bigger radius would come into play but doing your own testing would be the right route for me. I don't think anywhere within 22-28 is unsafe, it just comes down to feel. Tyre fitters have a blind spot with old school, lightweight cars. I'm sure tyre tech has some science but suspension behaviour does seem to still be a bit of a black art overlaying some sound principles.