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Surly Long Haul Trucker with installed StokeMonkey

On a long-tail bike the motor (in red) is installed behind the seat tube where it is less likely to run afoul of the rider's clothing. The motor is an adapted Crystalyte hub motor that runs like a giant outrunner. The entire motor spins while only the axle (attached to the stator that is not visible from the outside) is held fast. Note also the brake cable tensioner adjusted with the crossover cable hook.

Other brow-furrowing features include the rather thin phase and power cables that can't have been thicker than 18 gauge.

The drivetrain starts with a 16t freewheel connected to a 44t chainring on the left crank. After being passed through the bottom bracket the normal bicycle drivetrain on the right includes a 44t chainring and a 11-34t cassette on the rear wheel.

Despite my reservations, the system works well in practice and has lots of torque. But, the system's best selling point is the near-silent operation. Aside from some soft chain noise and low hum, the system generates little noise.

Exposure mode: program (auto)
Metering Mode: matrix
Exposure time: 0.033 s (1/30)
Aperture: f/2.8
Focal length: 8.0mm (35mm equivalent: 37mm)
ISO: 800
Flash: No
File size: 2423642 bytes
Camera maker: FUJIFILM
Camera model: FinePix F10
Resolution: 2848 x 1898

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