6 replies to this topic

[electricjim]

ive just upgraded my wheels from 12x4.5 (145 tyres) to 12x5 (165 tyres)

does anyone know what the tyre pressure should be, i asked the wheel supplier and they wernt very helpful, should i assume its the same pressure as with the 12 x 4.5s?

Thank you in advance

[AndyMiniMad.]

I would say you are correct...Same as the old ones...30psi should do it..So long as the flat bit at the bottom goes away..

[me madjoe 90]

I run 24-26 psi in mine.

24 in the rear and 26 up front.

Edited by me madjoe 90, 28 March 2011 - 09:05 PM.

[Cooperman]

I usually run 30 to 32 psi in all Minis.

[charie t]

You have not changed the weight of your car. Same pressures as originally designed. (unless stated differently by tyre manufacturer)
What you run them at is your choice, but radically different from what the book says can affect your braking, handling and tyre's wearing life

[Cooperman]

It's generally accepted that the manufacturer's standard pessures are for comfort, rather than shapr steering response. in some cars (my BMW for example) there are standard pressures for comfort and higher pressures for more high-speed driving.
For comfort I agree that the lower pressures are fine, but for better steering response and road-holding the figure of 30 to 32 psi always seems best.

[Tinkerbelle]

The high speed pressure on the BMWs and other cars with very low profile tyres is to limit any sidewall flexing, albeit minute to start with, to keep the tyre cool at high speeds (Autobahn speeds in summer can make them hot quickly), hence why they are the same for high loads also. As Cooperman said, this also has the effect of tightening the ride up.

My opinion, I run 30psi in the mini as I only really go anywhere with the Mini fully loaded with family and kit to runs etc. I've only really noticed a difference when they drop to 25psi or are over inflated to 35psi. Higher pressures also equals less tyre on the road and alledgedly less fuel consumption as less rolling resistance, not sure myself, I think Mini engines are sufficiently inefficient to hide that anyway

Matt