Motorbikes are generally treated as units of infantry except where noted below. Bikers can dismount and fight on foot as infantry, from which point none of these rules apply. To facilitate this, players will need mounted and foot versions of biker models.
A motorbike unit moves at 12” at an Advance and 24” at a Run with the same movement rules and restrictions for wheeled vehicles, except that bikes are allowed to make any number of turns as they move. Also, we do not allow motorbikes that have not yet dismounted to enter buildings, nor to board transport vehicles. Motorbike units cannot react to enemy attacks by going Down. However, they can react by making an immediate escape move in the same way as a recce vehicle (at normal speed, not double speed).
A motorbike unit can dismount as part of any Advance move. Once dismounted riders move and fight as infantry. Troops cannot remount once dismounted. Bike riders can carry infantry small-arms but cannot shoot whilst moving. All weaponry can only be fired when stationary, i.e. with a Fire action, in which case we assume riders momentarily halt or get off their machines to shoot.
Bikes are not allowed to make an assault, and if assaulted they can make an immediate escape move as for recce vehicles. If attacked at close quarters, motorbikes fight as infantry. Each man fights. We imagine any bike riders unlucky enough to be fighting at close quarters will abandon their machines to fight and then remount should they survive. Should they win the combat they can regroup 2D6" rather than D6". Sidecar riders are simply treated like two models mounted on a multiple base.