@Mehrad@Lluis_Revilla Imagine on a bike ride, you buy a new inner tube to change a flat. Instead of just Presta and Schrader valves which are the standard, you have 10 different standards and need adaptors all the time to inflate the tube and sometimes the adaptors don't work. Many of those valves don't fit in your rim. Isn't that annoying? Rims and tubes conform to Presta or Schrader standards not to give creators of Presta and Schrader valves extra credit. The patents have long expired.