Motorbike Write-Off Categories Explained

What Are Motorbike Write-Off Categories?

Motorbike write-off categories are used by UK insurance companies to classify motorcycles that have been damaged in an accident. These categories help buyers understand whether a bike is safe, repairable, or legal to return to the road.

UK Motorbike Write-Off Categories

Category A – Scrap Only

Category A motorbikes are severely damaged and must be completely scrapped. No parts can be salvaged or reused, and the bike can never return to the road.

Category B – Break for Parts

Category B motorcycles cannot be repaired for road use, but some parts may be salvaged. The frame must be destroyed, and the bike cannot be re-registered.

Category B: Should be used when any one of the following applies: (i) A machine that has suffered serious damage and is beyond any form of safe repair. (ii) Frame has suffered non-cosmetic damage (*when frame/chassis construction is an alloy or composite) (iii) Where the frame/engine Vin/identification has been tampered with i.e. removed or false identification implanted (iv) Where two or more of the following listed major assemblies cannot be safely repaired: • Fork assembly complete • Power Unit • Swinging Arm assembly – including suspension unit(s) Note: Where Category B (Break) is applied the disposal criteria is the same as the monocoque bodyshell/ chassis/frame

Category S – Structural Damage (Repairable)

Category S*: Will NOT APPLY to any machine with a damaged frame/chassis constructed from alloy or composite materials.
Category S**: Motorcycles and derivatives including quadbikes and all-terrain vehicles (ATV’s). (**When frame/chassis construction is mild steel and can be safely repaired in accordance with manufacturers specification and repair method Category S maybe applied).
Category S indicates structural damage such as to the frame or chassis. However, the motorbike can be professionally repaired and legally returned to the road.

Category N – Non-Structural Damage (Repairable)

Category N bikes have no structural damage. Repairs usually involve cosmetic or electrical components, making these bikes the least severe write-offs.

Category N: If none of the above definitions apply, then categorise as Category N (Non-structural). • Frame damage that is cosmetic and can be repaired paint only (*when frame/chassis construction is an alloy or composite).

Why Write-Off Categories Matter When Buying a Used Motorbike

• Safety: Understanding damage severity helps avoid unsafe bikes.
• Insurance: Some insurers charge higher premiums or refuse cover.
• Resale Value: Previously written-off bikes often sell for less.

Motorcyle VIN (Vehicle Idenification Number) Check

A motorcycle VIN check uses the 17-character Vehicle Identification Number (VIN) to reveal a bikes details like make, model, year, and history (theft, damage, ownership). It is found on the frame normally stamped on the steering neck or head stock.
It will also appear on the bike's registration document (V5C) and when buying a used motorcycle, it is essential to check that the VIN that is physically stamped on the bike's frame matches against the number printed on the V5C, any mismatch will indicate the motorbike is illegitimate and probably stolen or cloned.(find out more about ringing and cloning from the link above)