Capt. On a Bike?

[Dkoz]

Do any of the C:SM biker boxes contain the required parts to make a biker captain or is there a special part box needed?

[T10]

This plus a bog space marine on standard bike should do it.

http://www.games-workshop.com/gws/catalog/productDetail.jsp?prodId=prod1050240

Keep the bike and legs, use the commander bits for the rest.

[Mr_Rose]

Yeah, a basic biker (for the bike itself, plus legs and maybe one arm) with character parts will work. You can also use the "winged" fairing and/or robed biker legs from the ravenwing upgrade sprue to make your character more distinctive too.