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Paul Daniel is the owner and builder behind Green Pea Bikes of Ashland, Oregon. His company philosophy is simple – combining his passion of cycling with green energy systems, and creating performance electric bicycles. Paul’s NAHBS bike features a unique frame design, along with an innovative front suspension system, and of course an electric motor…

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The suspension design utilizes a linkage pivot that resides forward of the “headtube” and below the stem. An elastomer beneath the stem provides spring force and damping with one inch of travel. The bike’s fork is supported by two flextubes running either side of the downtube, which also form the seat stays of the bike.

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The bike’s frame tubes are constructed from straight gauge 4130 chromoly, with the build centered around a Shimano Alfine Di2 8 speed system. The battery driving the bike is 36V, 418WH. Maximum speed is 20mph, range depending on terrain, speed and rider weight. Expect about 30 – 50 miles depending on pedaling effort.

greenpea-bikes-nahbs-new-builder-201504Paul’s background as a mechanical engineer, and his work with Brammo Inc, developing electric motorcycles and lithium ion battery systems for electric vehicles, have clearly influenced his bicycle designs.

Photos and article by Gravel Cyclist.
Jayson O’Mahoney is the Gravel Cyclist: A website about the Gravel Cycling Experience.

Green Pea Bicycles

14 COMMENTS

  1. Genius!

    Love the idea. All in house tubing.
    Loose the elektric motor and u have a winner!

    Very practical with motor.

    Spring rate and load will have to depend on seat stay material and curve.
    Impressive! Good job

  2. WK – I think the spring rate will be primarily determined by the elastomer which appears to be just in front of the “headtube”. Or I am mistaken and it’s a torsional spring.

    The seat stay appears to be more of a lateral locator and should be flexible enough as to not offer significant vertical support. The design is kind of like a Telelever.

  3. If Paul Daniel would like to comment, I’d be interested to know if effective HT angle increases or decreases through the travel range.
    At first I thought it would surely increase, but after looking at it more, it is hard to say given the length of the lower “arm” vs the upper a-arm.
    Interesting

  4. Love NAHBS bikes. That looks like an amazing amount of work for front suspension, how about the back? I honestly think all bikes will have some amount of full suspension (maybe not track bikes) within the next 10 years, so I love seeing new takes on the idea.

  5. @JBikes I clearly aint PD but if it works like any similar system found on say some moto’s or other mtb parallelogram forks, the theory is the HA should stay the same though the range of travel.

  6. Very unique looking bike and impressive from a design/engineering standpoint.
    Is there a reason behind making the head-tube angle so steep though? Or does it just look that way?

  7. This would be frighteningly flexy. The lower “link” has little lateral stiffness, and that flex would be compounded by the fork’s length.

    Linkage designs need shorter, triangulated lower links, as seen in the moto world.

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