Tyre pressure indicator caps

[ghostbiker]

Unless it gets an impact it shouldn't leak, I used them for a couple of years without issue.
That was untill I did a track day and 4th session the extra weight of the cap sheared the valve stem and dumped all the air from the stem.
So the cap itself I would say is fine but the extra weight it adds to your stem at speed and Gforce in corners could be a problem.

Just my experience and opinion but I will never use one again.