> For example, if the shifter of a modern bike breaks after some years of use, a replacement part will probably no longer be available. I had this happen to me

> For example, if the shifter of a modern bike breaks after some years of use, a replacement part will probably no longer be available. I had this happen to me - the people in the store said that they don't carry six-speed shifters anymore. Meanwhile my bike mechanic said, with visible irritation, "Just use a seven speed and lock the last gear."