Originally Posted by gotchiguy
Think it was Martini that told me that a while back, he's always topping up/ letting air out his tubes so he ought to know
I think you may be confusing me with someone else
I'm often topping up because my tubes (a couple of chambers at least) leak like sieves.
I don't have pressure relief valves so if I top up prior to an early morning 50 mile passage, I'll let a bit out when I get to my sheltered harbour destination in anticipation of the 30 degree heat that'll be beating down on the black tubes for the rest of the day. Common sense really.
If you've got prv's then assuming they're functioning you never need to worry, you could connect a 100psi airline to the tubes, it'll p**s out as quick as you can get it in.
Black isn't the ideal colour for tubes depending on climate, if you regularly see over 30ish celsius then you might get fed up with burnt legs and flat tubes on cold mornings after hot afternoons.
As far as UV resistance goes, grey has the most resistant pigments, red has the least resistant