DVLA Rules for Motorcycle and Tricycle number plates
All motorcycles and tricycles must display a number plate at the
rear of the vehicle. Motorcycles and tricycles registered before 1st September 2001
may display a number plate at the front of the vehicle but are not required to.
If you have a two or three wheeled motorcycle or tricycle that has a body type of a four-wheeled vehicle, you MUST display a number plate at the front
and back of the vehicle.
Motorcycles registered on or after 1st September 2001 must display a two-line number plate. Motorcycles registered before 1st September 2001 may display a three-line number plate.
One-line number plates are
illegal, regardless of the date of registration.
Here are the character sizes:
Character Height
64 mm
Character Width (except the figure 1 or letter I)
44 mm
Character stroke
10 mm
Space between characters
10 mm
Space between groups
30 mm
Top, bottom, and side margins (minimum)
11 mm
Space between vertical lines
13 mm