Help - have I made an expensive mistake?

[DevonZ4]

Just to give some closure to this - I changed the fronts to Kumhos too (non run flats) and it has totally solved the problem. It feels like a new car!

So basically if you're planning on going from run flats to non run flats - my advice is to change them all at the same time.

Thanks everyone for your input and help.

 

[Bing]

I usually have 36 on the rear and 33 on the front. Pretty sure the stock pressures with RFTs are quite a bit higher though... Seem to remember 38 or 39 rear and 36 front ?