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Got air leaking from bottom of valve? Tyres sealed nicely, just a constant stream of air coming from bottom of valve? What have I done/not done?
Probably a lifted or damaged bit of rim tape. Air escaping from the biggest hole at the valve. Take it all off and have a look.
Tightened the valve enough?
Try pushing down on the valve from inside the rim as you tighten.
In the past I've put an o-ring between the rim and valve nut thingy..
Cheers
Most likely; leaking through tape into rim cavity, then out through valve hole. Leak is not necessarily anywhere near the valve.
Less likely; a leak around valve itself, but not impossible.
Least likely; valve itself damaged.
Its a brand new valve so I'll try retaping I think
I had that, made a gasket using an old thick tube puncture repair patch with a hole cut in it for valve
Fitting an o ring is easier than reaping so I'd try that first