Dave Kaufmann prefers using an RST R One
downhill fork, with 7 inches of travel on the front
of his hardtail EdgeRunner. The fork was a definite plus in ride quality.
Dave was worried about chain control, so he made this
chain idler by combining an old V-brake and a derailleur.
Sonny’s white bike uses a Crystalyte HS3548R direct-drive hub motor, and Kaufmann chose a 9 Continents
motor for his black one. The controllers are Infineon 6
FET 25A units, which are known for their reliability. The
battery packs are made up of four Turnigy 22.2-volt,
5000mah, 25c, 6s Lipoly packs to make a 44-volt, 10Ah
pack. These battery packs require care in handling and
charging. They are reasonable in price and pack a lot of
power, but Kaufmann stores his in the refrigerator and
Sonny in a locked, steel, fireproof box. Both use Cycle
Analyst cycle computers by Grin Tech. Once the CNC mill
was programmed, it made sense to crank out more kits.
Sonny now has kits for the EdgeRunner, the Yuba Mundo
and the Surly Big Dummy cargo bikes that sell for $1599.
That price does not include the battery. You can get them
at www.urbancommuterstore.com. ■