As time passes and your skill level increases you will find that you need specific tools. A Tire Gauge like this BSRT Scale Auto item (Item No HT381) is a must have item for the serious racer. You can measure tire diameter while the rim and tire are still on the car.
A BSRT Scale Auto Pro Wheel Puller (item No HT384). If you run silicone-sponge rear tires or flanged rear hubs you need this tool in order to remove such items in order that they may be transferred (without damage) to another axle.
If you have a Wheel Puller you definitely need a Wheel Press (BSRT Scale Auto Item No HT382). An essential tool for mounting silicone-sponge rear tires and/or flanged rear hubs to an axle without causing damage.
A Set Up Block. This can be as simple as a piece of Tomy AFX track.Specialty vendors and some of the majors offer precision machined units.These are great for judging clearance of magnets, pickup shoes etc, and mounting lexan bodies.