Cap appears completely GREEN when tire is properly inflated
A YELLOW ring appears if the tire pressure is low (approx. -25%)
A RED ring appears if the tire pressure is DANGEROUSLY low (approx. -30% or more)
Be sure to choose the BikeMaster Tire Pressure Indicator Caps (T-PIC) that match the tire pressure recommendations of your vehicle manufacturer. Proper tire pressure values can be found in your vehicle instruction manual
