Tire hardness has a huge affect on your car's performance. A tire too hard won't bite and a tire too soft may wear quickly or even ball up. Also tire hardness changes during its life cycle. To run your best you must keep track of all your tire's hardnesses. This easy-to-use tool will help you do just that - quickly, accurately & easily.
For the most consistent results rock the durometer from angled back past straight up to angled forward. The pointer will move up to the highest (true) reading, then back down. Record the highest reading reached.
Some parts are not legal for use in California or other states with similar laws / regulations.