QP-000045 Chrome Plated Brass 45 psi Tire Pressure Monitoring Valve Cap, (Pack of 4)

Bonne qualité.

One of the best low cost purchases I have made for my cycle. However, be careful. They read a little "delayed" meaning if you buy the 40# model and notice that a shade of the red is showing (90% green) then CHECK PRESSURE and ADD AIR. I bought another set of these 5# more than the pressure I actually maintain and it works perfect. Get ready for some of the mechanics to give you some smart ass comments. One guy tried to tell me that I was going to ruin my valve stems with the extra weight from the cap. I didn't feel like whipping out a dry erase board and explaining the force direction associated with centrifugal force to him. Anyway, they are super light as well. Seems like a little thing...but its a big time saver for cyclists like me to are methodical (for the most part) about checking moto tire pressure. Get a lot of positive comments from fellow cyclists and they ask how to find them

The only reason it gets one star is you cannot choose ZERO stars! Inaccurate! Even dangerous. I haul a lot of heavy stuff, such as scuba tanks (Hobby1) and lots of plywood and wood for woodworking (Hobby2) and concrete, stone, and more wood for Home Improvements (Hobby3). I air up my tires according to the Tire Manufacturing specs. My tires' max pressure is 41, so I keep my tires at 45 due to the often-heavy loads. Being rather particular about the maintenance of my vehicle, I believed this would be a quick and easy way to see when my tires need topped off. WRONG! Filled up to 45 psi exactly, according to three different air gages - two digital and one mechanical, with an error of + / - .25psi (they read to .5 psi), all four of the tire pressure gauge caps read 1/2 red & 1/2 green at 45 psi. Straight out of the package, they show 1/4 green and 3/4 red. To test them, I had to fill my tire to 57psi to get them to show all green! That is very dangerous! What one would expect is for them to show all-green at 45psi. This makes these devices totally worthless, potentially dangerous in that someone unknowing would continue to fill a tire until it shows all green --- DO NOT BUY.

I have used a Bluetooth product to track the pressure on my tire. The problem is that I had hit a curb and lost one of the sensors. The device in the car kept beeping at me because of that. So I decided to go with something simpler and less expensive. It works great.

Great item for both safety and convenience.