Forumslader Pro V6 [updated] -

to monitor battery levels, speed, and energy balance through a dedicated app. Pros and Cons

Since it attaches to the frame and uses magnets on any crank, you can move it between bikes easily (provided you glue a new strain gauge pad to each bike). It works on rim brakes, disc brakes, 1x, 2x, or even hub gears. forumslader pro v6