A thermoplastic endless belt (100, 150) has a smooth outer surface (105) substantially free of discontinuities and an inner surface (108) with a plurality of teeth (108) at a given belt pitch (112). The teeth (108) are adapted to engage a sprocket (102, 152) with circumferentially spaced sheaves (104, 154) at a sprocket pitch (116) greater than the belt pitch (112). The belt (100, 150) is slightly stretchable so that the sprocket (102, 152) can drive the endless belt (100, 150) when engaging the teeth (108) within a range of load on the belt (100, 150). The belt (100, 150) is preferred for use in conveyors in food processing industries where the smooth outer surface (105) can transport food items and is easier to clean and keep free of impurities.