Just got around to checking the tyre pressures on the Zed, and they're set to 32psi all round. The sticker in the door jamb recommends 2.3bar (34psi) but that's for 225mm all round. I have 235s at the front and 265s at the back.

 

I did a few back of envelope sums and to get the same aspect ratio contact patch, given the Zed's weight distribution, I come up with 31 front/25 rear. Sounds a bit low at the back, anybody out there running similar rubber? If so what pressures do you run?

 

Cheers,

 

Chris

Yeah I run 32 psi on all four with 225/45R18 and 265/35R18

Thanks. It certainly feels well balanced at 32 all round so I'll probably keep it like that! Cheers

I've always run tyres at 32, be it 16's,17's,18's or 19's whatever the width.

It just feels more in tune with the road.

Without getting my handbook out of the car, IIRC the stock UK pressures are something like 34 front and 36 rear - I have run on 33 front and 35 rear on 235/40/18 and 265/35/18 for years now and that feels about right.

 

You don't want to be running at high speed with the pressures too low; as the rubber will flex more, causing heat build-up which could lead to a blow-out. Also as speed increases, so too does the load on the tyres - hence why most vehicle hand-books tell you to increase tyre pressures to their higher recommended setting for sustained high-speed driving:wink:

i run 36 on everything, no exact science for me i always have had 36 in every car ive had more force of habit

Thanks Richard those are exactly the tyre sizes I'm running. I'll try upping mine and see how it feels.