[OnlyOneCannolo]

Assuming you know how to work them, and are comfortable enough riding to reach down and fiddle with them.

[ldiracdelta]

And the entire market of 10-speeds figured it out before the new complex shifter systems became mainstream in th 90s. Fixees for the rest, I guess.

[OnlyOneCannolo]

Or automatic shifting for the untapped market of people who wouldn't figure it out but also wouldn't ride a fixie. I can see the concept getting more popular as the price of electric bicycles decreases.