Putting some wind in the round black things this morning, got plenty in...took the compressor hose fitting off and there was the sound of rushing air....the bloody valve had come apart and the actual valve body had come clean out of the rubber surround......handling is aweful with only the rubber to hold the bike up, thankfully it was at the back, so steering was not too bad actually - got it down to the tyre place, only about 1km from home. Good start to the day. 
