Join Date: Jan 2008
Location: Boston, Lincs
Re: Tyre pressure warning valve caps
I have a set of similar things on mine and I find them useful, a quick glance every morning is very reassuring - or otherwise !
Mine indicate Green for correct, Yellow down by, I think, 2 psi and Red for further down. All it is is three different colour sleeves within the cap so no hi tech stuff here. Got 'em from eBay for less than a tenner, of course you have to specify the psi range you want.
The only concern I have is that I suppose the tyre valve has to be permanently depressed for these to work so it seems to me you are depending on the cap itself to keep the air in. Having said that after two years they have been no problem except for one time when the valve was sticking open, a few quick depresses sorted that out OK though.
I reckon that they are worth having but of course I still check with a proper gauge every so often.