8x18" OZ Ultraleggera on RS Cup

[Guggeman]

Does anyone know the ET for the 18" rims on Red Bull Edition, and the width of these (8")?

Does anyone have experience of, how the 8" width, with ET55 affect the racing performance, versus the standard 7.5" and ET68?

Anyone who have experience about the difference in the racing performance between 215/40/18 and 225/40-18.

I have plans to mount OZ Ultraleggera 8x18 ET55 with Michelin Pilot Super Sport 215/40-18 on my RS Cup. These wheels broadens (outwards) 1/4 inch + 13mm (68-55). Will it work without any issue?

Or is 7,5x18 ET55 a better choise?

 

[X82]

For the tyre size I would recommend a 225/35 18, 215/40 is a little too small and 225/40 a little too big.