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  1. #1
    Senior Member
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    Soma cyclocross with Bionx PL500HS
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    Are there any pedal sensing chain driven kits?

    The one thing I love about my Bionx is that the riding experience is still like a bicycle. I don't have to use a throttle to get the assist. It senses my pedalling effort and multiplies that. However, it still has the drawbacks inherent in hub motors - cogging effect (drag), weight, and efficiency.

    Chain driven motors add no drag in the wheels, their motors are a few pounds lighter and smaller, and they can operate at peak efficiency at any speed my gears allow (that translates to longer range).

    For my next e-bike, I'd like to find a chain driven kit that can also multiply my pedalling effort like Bionx. Does anyone know of such a kit that's out there?

  2. #2
    Administrator Allen's Avatar
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    Salsa La Raza, Panasonic Electric, Bria, Bamboo touring, Bamboo cargo
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    That's what I love best about the Panasonic drive on my Giant. No twist throttle at all, it's all from the pedal sensor and it gives more the more I put to the pedal. And the fact it's a chain drive is cake too.

    Other than Bionx I haven't seen a kit with a pedal sensor. Maybe if you can source just the sensor from Panasonic or Bionx and then use that as the throttle to a motor.

    One thing about chain drives is you need quite long chainstays to have room to mount the motor between the seat tube and the rear wheel.

  3. #3
    Senior Member
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    Hmm... we also have a Giant LaFree e-bike. It's about a couple of years old. Although the assist is pedal activated, it definitely does not vary according to my pedaling effort. I assume it also uses the Panasonic drive. If so, did they add a variable assist sensor based on pedaling effort?

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