The Michelin Man "BIB" Key chain gauge is a handy gauge that is always ready to go and as convenient as your car keys. It is easy to use and easy to read. With a pressure range up to 99 PSI this gauge is perfect for the daily commuter or the 1 ton pick-up truck. Driving with correctly inflated tires is important for several reasons: increased safety, reduced tread wear, improved handling and ride performance and better fuel economy.