All of a Chapter's Assault Marines, Scouts and the entire 6th Reserve Company are trained to fight as Bike Squadrons. These units are supplied with the ubiquitous Space Marine Bike. This robust machine is powerful enough to carry a fully armoured Space Marine rider and sports twin-linked bolt guns. The Bike Squadrons can be reinforced with Attack Bikes, modified Bikes with a two-man crew and a pintel mounted heavy weapon (a heavy bolter or multi-melta).

The Marine riders retain their normal Squad markings even whilst deployed as Bike Squadrons. The Bikes will display Chapter, Squad and tactical markings and may fly pennants or flags showing additional Squad and Chapter badges. Sergeants do not display their back banners when leading Bike Squadrons.

Bike Squadrons are often used for reconnaisance missions into enemy territory. When deployed as part of a larger battleforce, their speed and hitting power gives the Commander extra attack options. Attack bikes can be used to reinforce Bike Squadrons or fielded as Squadrons of their own. Attack Bike Squadrons can be deadly as their mobility enables them to hunt down enemy tanks and destroy them before the enemy can return fire.

Pennants are edged in Company colour	Tactical markings
Squad numbers appear on front cowling and pennant