Motorcycle Number Plate Size in the UK: The Legal Rules Explained
There is no single legal size for a motorcycle number plate in the UK. The law sets the size, layout and style of the characters instead. Motorcycles registered on or after 1 September 2001 must display a two-line plate on the rear only, with characters 64mm tall and 44mm wide.
A lot of riders, and even some suppliers, assume a motorcycle plate has to be a set size, such as 7 x 5 inches or 9 x 7 inches. These are common sizes, but neither is a legal requirement. What matters is whether the characters, spacing, layout and markings meet the DVLA rules and the current British Standard. In this guide, uGroup UK explains exactly what the law requires, so you can supply or fit road-legal motorcycle plates with confidence.
The Legal Rules for UK Motorcycle Number Plates
The rules for motorcycle and motor tricycle number plates are set out in DVLA leaflet INF104 and the Road Vehicles (Display of Registration Marks) Regulations 2001. In short, a road-legal motorcycle plate must:
- Be displayed on the rear of the motorcycle (bikes registered on or after 1 September 2001)
- Show the registration on two lines
- Use characters 64mm tall and 44mm wide (the number 1 and the letter I are exceptions to the width rule)
- Use the mandatory Charles Wright font, with correct spacing between characters and groups
- Show black characters on a reflective yellow background
- Be made to British Standard BS AU 145e if fitted on or after 1 September 2021
- Carry the supplier’s name and postcode, along with the British Standard mark
Rear Plate Only: The 1 September 2001 Rule
Motorcycles and motor tricycles registered on or after 1 September 2001 must only display a number plate at the rear. Fitting a front plate to these bikes is not allowed.
If your motorcycle was registered before 1 September 2001, you can display a front plate as well, but you don’t have to. Many older bikes no longer use one, mainly because of rider safety concerns.
Character Size and Two-Line Layout
On a motorcycle plate, the characters are smaller than on a car plate. This allows the registration to fit the limited space at the back of a bike, while still being readable by other road users, the police and ANPR (automatic number plate recognition) cameras.
Motorcycle characters must be:
- 64mm tall
- 44mm wide, except the number 1 and the letter I
DVLA leaflet INF104 also sets the stroke width, the spacing between characters and groups, and the margins around the edge of the plate. The plate itself just needs to be large enough to fit all of these correctly.
The registration must be shown on two lines. Motorcycles registered before 1 September 2001 may use a three-line layout. A single-line plate is not legal on a motorcycle, whatever its registration date.
Why Character Size Matters More Than Plate Size
A number plate’s job is identification. Getting the character height, width, font and spacing right means your registration can be read accurately by the police and by ANPR cameras on motorways, at speed enforcement points and in car parks.
When characters are squashed, re-spaced or printed in a stylised font, the plate becomes harder to read. That is why the law focuses on the characters rather than the overall plate dimensions. A bigger plate doesn’t make a bike more legal, and a smaller plate is only acceptable if the legal characters and margins still fit.
Show Plates vs Road-Legal Plates
Small motorcycle plates, often 7 x 5 inches, are widely sold online. In most cases the characters on a plate that small are below the 64mm x 44mm requirement, which means it can only be used as a show plate.
Show plates are fine for shows, private land and display purposes, but they are not legal on public roads. If a plate is sold as “road legal”, check that it has the British Standard mark and the supplier’s details, and that the characters meet the legal dimensions.
BS AU 145e and Motorcycle Plates
All number plates fitted on or after 1 September 2021, including motorcycle plates, must meet British Standard BS AU 145e. The standard sets requirements for durability, reflectivity and how resistant the plate is to weather and damage. It also requires characters to be a single shade of black.
Every compliant plate must be supplied by a business registered with the DVLA Register of Number Plate Suppliers. The supplier has to check the customer’s identity and entitlement to the registration before making the plate. For more detail on the standard, see our guide to BS AU 145e and what it means for dealerships and fleets.
National Identifiers and Electric Motorcycles
You can choose to display the UK national identifier on a motorcycle plate. Some approved flags can also be shown alongside it. These are optional, and they don’t change any of the rules on character size, layout or colour.
Electric motorcycles follow exactly the same number plate rules as petrol bikes. There is no separate size or layout requirement for them.
Penalties for a Non-Compliant Motorcycle Plate
Riding with a plate that doesn’t meet the rules can lead to:
- A fine of up to £1,000
- An MOT failure
- In some cases, the DVLA withdrawing the registration number
The most common problems on motorcycles are undersized characters, single-line layouts, stylised fonts and plates with no supplier or British Standard markings.
Motorcycle Number Plate FAQs
What size is a legal motorcycle number plate in the UK?
No overall plate size is set by law. The characters must be 64mm tall and 44mm wide on two lines, and the plate must be big enough to fit them with the required spacing and margins.
Are 7 x 5 motorcycle number plates legal?
Generally, no. A 7 x 5 inch plate is usually too small to fit legally sized characters, so it can normally only be used as a show plate.
Do motorcycles need a front number plate?
Bikes registered on or after 1 September 2001 must only display a rear plate. Bikes registered before that date can display a front plate, but it is optional.
Can a motorcycle number plate be on one line?
No. Single-line plates are not legal on any motorcycle, whatever its registration date.
Compliant Motorcycle Number Plates From uGroup UK
uGroup UK supplies the motor trade with high-quality, fully compliant number plates, components and self-assembly systems. Through Hills Numberplates and Bestplate, we help dealerships, motorcycle retailers and plate resellers produce road-legal plates that meet BS AU 145e every time.
For the wider picture on plate law, read our complete guide to UK number plate legislation. If you’re unsure about a motorcycle plate format, or want to set up compliant plate production in-house, contact the uGroup UK team and we’ll be happy to help.
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