Entire Bike in 2009
OwnerGregg Berkholtz
LocationPortland, Oregon United States map
Web/EmailWebPage email image
Vehicle2007 Giro 26
Motor Scorpion 4025-16 3-Phase AC
Brushless Outrunner R/C motor
DrivetrainRegular crank & Rohloff for the human-power. Brushless outrunner
pulling a belt around a Golden Eagles Drive Ring for the power-assist.
ControllerCastle Creations HV85
R/C Controller
Batteries1 Ping 24v/20a, 24.00 Volt, Lithium-Ion

Also using Headway and DeWalt packs.
System Voltage24 Volts
Charger Ping
Heaterwool clothes
InstrumentationCateye Bike Computer
Top Speed20 MPH (32 KPH)
Designed to reach top speed only when operator pedals. Could go
faster, but is geared for power-assisted hill-climbing, not road-racing.
AccelerationGood enough for ear-to-ear grins
Range40 Miles (64 Kilometers)
Realworld tests
Watt Hours/Mile12 Wh/Mile
On flat city roads.
EV Miles
Current:5,000 Miles (8,045 Kilometers)
Seating Capacity1 adult
Curb Weight50 Pounds (22 Kilograms)
Tires26" diameter Marathon Plus tires with Kenda airless inserts
Conversion TimeThree months to design, one evening to build, and another year of
tweaking :-)
Conversion Cost$900
Additional FeaturesAlso facilitates a combined drive-shaft that integrates a gasoline engine, which enables 246MPG
(validated through two round-trip rides from Portland Oregon to the coast and back). Intent of the
gas-assist is to cost-effectively enable long-distance trips.

Details on the MPG measurements:

code by jerry