It is hard not to like this idea: You replace your rear  bike wheel with this special FlyKly wheel which houses a motor, a controller, and some batteries. You set the speed with a smartphone or Pebble app.

flykly-specs

On the downside, you are also replacing your rear gear sprockets and shifting mechanism and it doesn’t seem like you can have too much control with a smartphone for changing speeds while biking.

FlyKly

Estimates look like the product will hit production late next year.

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