I bought a 6-speed even though where I live the terrain is flat. I got the 6-speed because at the time I traveled. Later I bought a used 2-speed rear wheel. I went with that because I retired and travel less. I was only using the mid gears as a 6-speed. I liked the simplicity of the two speed. I later added a Bikegang 2-speed to 3-speed kit. When you have a rear flat changing the tire is easier. It weighs a little less and may feel a little faster.