Originally Posted by
I-Like-To-Bike
Used 'em for years on my German made bikes. They seem to have less need for topping up with pressure and I could go weeks before noticing any loss of pressure. Also kept an adapter screwed in the valve to at least one tube per bike so that I could use any pump or compressor fitting. Kept an adapter in my patch kit too. Think I paid about 1DM/pair for the adapters.
That may speak to the quality of the tubes themselves... the Schwalbe tubes I prefer for Shrader have excellent threaded stems and are very well sealed as are Continental tubes.