What is the stock tire size for a 94?

[Ybnormyl]

Begining to question if someone before me changed the tire/wheel size. Does any one know what came stock on a 94 Coupe? Thanks

[Luke@tirerack]

non ZR1
255/45-17 (F) 285/40-17 (R)

ZR1
275/40-17 (F) 315/35-17 (R)

[Ybnormyl]

Thanks,
Now how do I measure the offset on the wheel.
On a 94 I believe it should be 57cm
Is this correct?
Do I measure from the outer rim to the center flange plate on the OUTSIDE of the wheel or the Inside????
Thanks for your help.