Size of registration markMotorcycles only need to exhibit on the rear of the machine of course and have a choice as to the dimensions. These dimensions are set out below. The larger ones being generally applicable and the smaller ones being the alternative available to bikes.
Must conform to:
BSAU145A
SAU145D (from 01.Sept.01)
Must have black characters on yellow background.
Only authorised font (or substantially similar).
Characters:
Height: 64mm x 44w
Stroke Width: 10mm
Space Between Characters: 10mm
Space Between Groups: 30mm
All Margins: 11mm
Symbols: Eurostars or GB – only ones permitted.
Hope this stops the confusion on the size of your numberplate legistration.