Posted: 22/05/2016 at 22:05
Normally I carry just one, but with sticky repair patches as back up. On IM races, two tubes.
Pressures? 90 front, 100 rear. (Conti GP4000 700c x23). Maybe plus 5psi on race day, but not when it's hot. Maybe minus 10psi if it's cold and wet. Minimum tyre pressure is important. I've had more punctures when the tyre is at 80 or lower.
I've found that a bike mounted pump can't get higher than 80 psi, and that is after an extended amount of pumping. The gas cans don't even get that far.
(At IMW I thought I'd hit the jackpot when I found a spare tube in the road. Only to discover that I'd lost my own spare#2). Oh well.
I know one guy who uses the tyre gloop from new. At one point he discovered that he's been riding on a multi-punctured tyre without knowledge. An interesting thought.