Originally Posted by
Dan515
I'm out of the loop - could you explain to me how this works? It's an internal gearing system or something?
Yes, it's a
planetary gear train inside the rear hub, shifted by a cable. The first commercially successful one was introduced in
1896. Current models made by Rohloff, Schwinn, Shimano, SRAM-Sachs and SunRace Sturmey-Archer in 2, 3, 5, 7, 8, 9 and 14-speed versions.
tcs