Tire Pressure Monitoring Valve Caps Sensor Gauge - Advanced Detection System, 45 PSI Sensing Air Alert Indicator for Cars, Trailers, Bikes - Chrome-Plated, Pack of 4

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'm kind of mixed on these. These worked great for giving me a quick visual indicator on the tire pressure in my sports car. After about a year, one of my front tires went flat, and I was about to replace it, when I decided to check it with soapy water first. The pressure gauge had taken enough of a beating over a years time that it was leaking out all my air! The guy at the tire shop said that he'd seen that happen a lot. Instead of buying a new tire, and still losing all my air, I just replaced the pressure caps with some nice $3 anodized caps, and check my tire pressure once a month.

I ordered this product because it seemed like a convenient way to keep an eye on my tire pressure. It arrived within the given estimated parameters, but closer to the end.. No biggie. I followed all the directions for installation, even though I felt that just screwing them on would be fine... Two worked fine and two did not. On the two that didn't work, it was the indicator that tells you if you need air. Its like it would get stuck or jammed half-way between green and red. My tire pressure was fine so that wasn't the issue. I rotated them to two other tires with the same result. Same two worked, same two didn't work. Trashed em' and put the plastic covers back on.. Also I gotta say, I don't know what I was expecting for the price, but I kinda hoped they would looked better crafted.

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.

This is a quick way to check the tire pressure during a casual perimeter tour of the trailer and tow vehicles. I do verify the pressure with a tire pressure gauge before taking a long trip, but these make the daily checks much simpler. While they do not provide an "exact" reading, they do provide a visual alert if the pressure drops below the specified range (about 10%). This is helpful when moving to a lower altitude, or when the temperature drops significantly when traveling or as a result of seasonal variations.

Great item for both safety and convenience.

Usually I don’t worry a lot if the product arrives late to me because sometimes bad weather will affect the arrival time. But for this product beside the late arrival it : Came with a lot of scratches. It is useless, I filled the tires with 44 psi but nothing shows up “the glass did not became full green one”. I followed the instructions but sill nothing came. This product is waste of money.

Bonne qualité.