Alloy wheel options?

My Cougar reads dead-on, achieved by the trial and error method of constant speed straight-line runs with the dash apart, using the sat nav for reference and several re-positionings of the needles. (Tyres are 225/45/17)

The Fiesta consistently reads exactly 1 MPH over at all speeds, achieved by nothing more than changing from 195/45/16 wheels and tyres to 205/40/17s on ST200 alloys.
 
Mine reads spot on to the sat nav since I put the 18's on, for ref. The tyre size is 225/40/18
 
My speedo reads absolutely bang on the mark thanks to Uncle Al aka Pid_16v. Reads absolutely on the nail with the satnav - and that's running with my BK alloys which run 215/45/17 Falken tyres.
 
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