[scotty]

Originally Posted by SilverSurfer

A number of issues really. Speedo accuracy and depending on wheel offset - outer arch clearance, inner arch clearance and tyre to shock clearance.

Classic Standard tyres on the 16's were 205/50 x 16, so to match the rolling radius this equates to :

Preferred sizes :
215/40x17 (will give a speedo error of +1.2%)
215/35x18 (will give a speedo error of +0.61%)
225/35x18 (will give a speedo error of -0.54%)

Non-Preferred sizes :
215/45x17 (will give a speedo error of -2.2%)
225/45x17 (will give a speedo error of -3.6%)

45 profiles normally end up on Classics if they have moved from a Newage, as these use 45 profiles on their 17's and 40 profile on the 18's.

Wow that is good info to know Scott