Question on rim sizes

[glenf]

Hello out there

I have a 2001 Porsche boxster base 17'' rims

does anyone know if I can change rim size over to 18'' without any modifications at all?
will this effect performance or RPM etc?

[Ciao]

Yes as long as you remain within standards for the 986. Performance will determine on type and size of tires.

[glenf]

much appreciated!