Mockup with cardboard batteries
OwnerTommy Ausherman
Owner's Other EVs2008 KMX Typhoon Trike
2011 FFR Transition 311
The Model F
LocationAsheville, North Carolina United States map
Email email image
Vehicle1998 Trek 830 20 inch
I decided to use a Chromoly Trek 830 frame to build an electric bicycle around.
MotorBriggs and Stratton Brushless E-Tek Permanent Magnet DC
Drivetrain12T to 48T #35 chain. 4:1 reduction. Wheel sprocket mounted on center lock disc rotor.
ControllerSevcon Millipak PMAC
100 Amp max continous, 250 Amp max 10 sec burst.
Batteries3 B and B HR22-12, 12.00 Volt, Lead-Acid, AGM
I am currently working on a 48V 20 Ah Lithium pack that weighs 20lb instead of 45lbs.
System Voltage36 Volts
ChargerBass Pro XPS
3 bank x 5 Amp
InstrumentationSpecialized Turbo Bike Computer, Voltmeter, Ammeter
Top Speed44 MPH (70 KPH)
Top speed is limited by motor rpm, plenty more torque for more top speed with taller gearing. I would say it is capable of 50mph+.
AccelerationVery quick, not yet timed.
Range15 Miles (24 Kilometers)
EV Miles
Current:120 Miles (193 Kilometers)
Curb Weight140 Pounds (63 Kilograms)
Bike - 32 lbs
Motor - 22 lbs
Batteries - 45 lbs
Controller - 6.5 lbs
Cable - 5 lbs
Metal bracketry 29.5 lbs

I think I can lose 10-15 lbs whenever I get the time by duplicating the steel parts in aluminum.

Another 25 lbs will be shed with Lithium batteries from Makita packs.

The bike currently weighs 310 lbs with me on it.

Goal Weight:
TiresMaxxis Hookworm
Conversion Time3 months design, 1 month build time
Conversion Cost~$1200
I am very happy with how this turned out, It has tons of torque and can maintain over 20mph up very steep grades.

My final goal with this project is to achieve over 60mph to set the speed record for an electric-powered mountain bike.

Video of it running on the old AGM's, steel bracketry, 100Amp max continous at 36V:


code by jerry