The Tire Pressure Caps are great for keeping a track your tires air pressure indicating red, yellow or green. Properly inflated tires will give you better gas mileage and is better for the environment. The threads are universal with a outer diameter of 7.7mm.
- Works with most cars with stock tires - not trucks
- Tracking tire when pressure of 35PSI to 42PSI
- Red=Low, Yellow=Medium, Green=Good Pressure
- Universal Schrader threads 7.7mm OD
- Comes with 4 valve caps
A Schrader valve consists of a valve stem with an outer diameter of 7.7mm. Schrader valve are universal and used on virtually every car, truck, ATV, motorcycle, and most bicycles.