4 x Car Valve Tyre Caps - Monitor Wheel Pressure 30-32-34 PSI Tyre Air Sensor Alert Indicator Stem Cover Stainless Steel

Came across these whilst searching for something else. . . what a great idea.I have a very slow puncture in one tyre (not bad enough to pay for an expensive repair) and these are ideal to monitor for that (and keep an eye on the other 3 tyres). Very simple, nothing to do except look at them every time we use the car. (an ideal role for my young son to undertake).

Absolute rubbish,they replaced the first set once because one was faulty and let all the air out of my tyre., I went away for a week leaving the car in my garage and returned to find yet another flat tyre (different wheel). i inflated the tyre a week ago and its stayed inflated without these caps on, don't waste your money, in fact I've got 7 of the things I will never use again!!

They protude a bit further from the valve than I expected but I'm not that surprised. Only 3 of the 4 valve caps work and I'm not going to order another set just for one more valve cap. The other 3 seem to work quite well, I just hope I don't get a slow puncture on the 4th wheel. It's a pity the don't test the valves before shipping or maybe I was just unlucky.

Do not seem to work that well - the different colours that are supposed to appear as the pressure declines are indistinct and inconsistent in terms of when they appear and how far they stick out. Also cover gets dirty very quickly and so need to keep wiping them to be able to see anything at all.

Rubbish, hit a curb, tyre went flat, still registered green, not very reliable, plus the garage that put a new tyre on, recommend, not to put these, on. Recommend, plastic dust cap, as these tend to rust, which will cause issues.

These are brilliant at letting you know which of your tyres is down when your in car alarm goes off that a tyre is losing pressure but doesn't tell you which one it is, at least with these you can see at a glance which has lost pressure.

Only just started using them upto now they are perfectBut have to be careful not to hit the kerb as they protrudeBeyond the wheel rim

As this product is a recent purchase,I cannot give a true assessment but they were easy to fit appear to be working Iam happy.