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Did an 24 mile ride this evening on one of my usual routes. It had about 85°F and the airstream while riding was nice.
A quarter mile after a pretty fast descent I've noticed that my rear tyre had lost all of its air.
I didn't notice anything during the descent itself and was happy that I didn't crash during the decent and that I've had a spare inner tube and a CO2 cartridge with me. Neither the tyre nor the old inner tube showed anything unusual and I suspect the valve itself as the cause. I run the tyres at 70psi which I don't view as too much pressure for a 25mm tyre.