Sisu KB-24 is a two-axle lorry and special vehicle chassis made by the Finnish heavy vehicle manufacturer Suomen Autoteollisuus (SAT) from 1955 to 1960. It is a six-tonne delivery lorry planned to operate on narrow streets in Finnish cities.The marketing name for the vehicle was Nalle-Sisu, "Teddy-Bear-Sisu". The power options included petrol and diesel motors.