The How to Draw CARS Stencil is a great addition to the CARS Sketchbook. There are three perspective layouts to choose that will help you with the basic proportions. As you become more efficient, try using the ellipse template shapes to set up your own wheels in perspective.
Made from a clear durable plastic thats thin enough and flexible enough to work with most types of pencils, markers and pens. Fits perfectly inside the sketchbook so you can take it with you wherever you go.