Those valve cap tyre pressure indicators
Discussion
Demon Tweeks sell them too.
I had a set on my rally car for a while but decided against using them. They work by pushing open the tyre valve as they're tightened, so allowing the tyre pressure to register on the the colour coded plunger in the top of the cap. If they come even slightly loose then you'll have a slow (or not so slow puncture) as the valve is not able to close. I found I was becomming paranoid about it, so if you want a set of 32psi ones (and if I can find them) then they're free to a good home.
Just my two penneth.
I had a set on my rally car for a while but decided against using them. They work by pushing open the tyre valve as they're tightened, so allowing the tyre pressure to register on the the colour coded plunger in the top of the cap. If they come even slightly loose then you'll have a slow (or not so slow puncture) as the valve is not able to close. I found I was becomming paranoid about it, so if you want a set of 32psi ones (and if I can find them) then they're free to a good home.
Just my two penneth.
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