Review on 🚗 INCART Car Tire Valve Cup: 36 PSI 2.4 Bar Air Alert Sensor - 4 Pcs by Chris Fisher

They work and are cheaper than the red, green and yellow tricolors. I wish I had spent money on 3 color ones. When the tire is green, you know everything is fine. However, it can be at least 6 pounds lower and still be green. I haven't tried lowering the pressure to see how far it has to drop before it blushes, but 6lbs is a lot. For example, when I noticed my tire was red, there was barely 20 pounds of air in it. Well, I may have just overlooked it before, but you can see that a yellow color for the problem alert makes sense. I will get a 3 color look to replace them.