wheel question again

[montsta56 nz]

Hi
Im looking at buying some 18' schnitzer replica's off an E38 to go on myE34 I know they'll fit. but the rubber he has on them at the mo are 255/45/18 I suspect they be sweet on the rear but will there be a drama on the front.?

[GJPinAU]

Hi
Im looking at buying some 18' schnitzer replica's off an E38 to go on myE34 I know they'll fit. but the rubber he has on them at the mo are 255/45/18 I suspect they be sweet on the rear but will there be a drama on the front.?
I have 18's on my E34 with 235/40/18, which is the correct rolling diameter for our cars on 18" wheels.
The size you're quoting will muck up your speedo.