In the last couple of weeks my rear tub has been going flat overnight. Pumping it up to 120psi of an evening, riding the next day then that evening it's probably at 50psi - very soft.
I've used a zipp valve extender ( pair) for ages but for some reasons the rear extender seems to be allowing air to escape.
I've just tested this by fitting tub with a valve extender and pumping to 100psi, you can simply hear the air escaping !! Inflating the tub without a valve extender it holds air fine. Put the wheel in the floor and push down on it to replicate a riders weight and it's gushes out.
So it looks as if I need a new valve extender.
I have a continental one spare but that for some reason doesn't screw into the valve !!!
Any suggestions on what is going on or recommendations for extenders... Need to get this sorted for the ride London 100 in a week. ( that's now a massive cock up too)
Story of my life.
HELP