The foot operated anti-tip is available in two versions. One for indoor frame and one for outdoor frame. The anti-tip increases the supporting surface or “footprint” of the frame and thus, decrease the risk of tipping. The anti-tip should be considered if the user is often positioned with the centre of gravity far back, for users where siblings or other children might, unintendedly, lean on the push brace or when used for transportation in a vehicle. The anti-tip for indoor frame can be used on frames with 75 mm or 100 mm castors.