Abstract: A slip form paving machine including a main frame supported by a front driven steering wheel and a pair of rear wheels that straddle the fore-and-aft center line of the main frame. An open top hopper is mounted on the frame and the lower end of the hopper communicates with an open bottom slip form, so that paving material, such as concrete fed into the hopper, will flow downwardly and be discharged from the slip form as the machine moves over the terrain. An outrigger frame is pivoted to the main frame about a horizontal axis and is located laterally of the rear wheels. The outrigger frame carries an outrigger wheel which is located laterally outwardly of the slip form and an inclined scraper blade is mounted forwardly of the outrigger wheel. When using a relatively wide slip form, the outrigger wheel is engaged with the terrain, and the rear wheel closest to the outrigger wheel is raised above the terrain so that the machine is supported on the outrigger wheel and the other of the rear wheels.