4D motorbike number plates carry laser-cut 3mm solid black acrylic characters on a 9" × 7" (approx. 230mm × 178mm) reflective yellow BS AU 145e plate, the size we make for motorcycles, quad bikes and scooters, with the registration set over two lines. It is sold as a single plate: a motorcycle carries a rear plate only, while a road-registered quad needs a front plate as well. 3mm is the only 4D depth we offer on a bike plate. Made in County Durham by a DVLA-registered number plate supplier. Order before 2pm on a working day with your documents approved and we make it the same day.
How it is made
Each character is cut on a laser from 3mm black acrylic in Charles Wright at the size and spacing prescribed for a motorcycle plate, and bonded with a high-strength adhesive to a reflective yellow plate carrying our supplier name, postcode and the BS AU 145e mark. The acrylic does not yellow or dull in sunlight and can be pressure washed. For the same plate with glossy domed characters see the 3D gel motorbike plate; for a flat plate see the printed motorbike plate. Our 4D number plates guide compares every 4D style we make.
Is it road legal?
Yes, when the finished plate meets BS AU 145e and the number plate regulations, which allow a smaller character size on motorcycles registered from September 2001. Every 4D motorbike plate we make is built to them: Charles Wright characters, a single shade of non-reflective black, a reflective yellow background with no tint or pattern, and a registered supplier's mark. What stops a camera reading a plate is tint, a patterned background, a non-standard font or spacing, or damage, not raised characters. Our guide to 3D and 4D number plate legality covers the rules, ANPR and infrared.
A proposed BSI amendment that would stop the production of raised-character plates was consulted on until 13 December 2025 and is still under consideration; nothing has been adopted, BS AU 145e:2018 remains the current standard, and 4D plates remain legal to make, sell and fit. We have not been told when any change would take effect or how plates already fitted would be treated, and we will say so here as soon as we are. Checked 8 September 2026.
Care
Wash it with the bike, by hand or with a pressure washer held at a sensible distance, and keep solvents and abrasive polish off the characters. See cleaning your 3D or 4D number plates.
Warranty
36 months against manufacturing defects, which covers the plate, the print and the bond between character and plate. It does not cover damage from fitting, impact or chemicals.
What to order
In the plate builder choose 4D 3mm and the motorbike size; for a motorcycle set the front plate to none, for a road-registered quad order a front plate as well. Proof of registration is required first (valid documents); postage is under delivery options. If your bracket has holes, use a screw kit; if it is a flat surface, use sticky pads.
