I use the Wheels Manufacturing sleeves on my trike with 20" wheels and they work fine. They are a tight fit through the Schrader hole. They do stick up a bit so I am thinking about trimming them down the next time I have the tires off. I have also used stepped nuts for presta valves. These come with Schwalbe and Continental tubes. The diameter of the step fits into the Schrader hole to stabilise the stem.