Specifications

Motors

Motor Type:
BMC: Brushless DC with external PWM controller
Powerpack: Brushless DC with external PWM controller

Rated Output Power*:
BMC Motor at 36V: 600W
Powerpack Motor at 36V: 750W

Maximum Output Power:
BMC Motor at 39V: 750W
Powerpack Motor at 39V: 1000W

Motor Operating Voltage Range:
BMC Motor: 21-44V
Powerpack Motor: 19-44V

Maximum Motor RPM:
BMC at 37V: 4000
Powerpack at 37V: 4000

Peak Power Motor RPM:
BMC : 2500
Powerpack: 2800

Startup Current Limit:
BMC: 17 Amps
Powerpack: 35 Amps

Running Current Limit:
BMC: 30 Amps
Powerpack: 35 Amps

Motor Efficiency: 87% max.

Weight including controller
6 lbs (2.7 kg)

* Rated power is what a motor can continuously put out under all operating conditions. Both the BMC and the Powerpack motors are capable of much more than rated power for long periods of time or even continuously in cool temperatures. The BMC runs cooler than the Powerpack and so can exceed its rated power for longer intervals. Exceeding rated power output for long periods in hot weather is likely to result in the controller shutting itself off to prevent damage. If this happens, it can take quite a long time for the controller to cool enough to come back to life. Expect to pedal some in this situation.

Drive Unit

Weight, typical
5 lbs (2.3 kg)

Maximum torque at center drive spindle:
approx 100 N-m

Gearing†

Mid-Drive Reduction Gearing:
Planetary Gear: 4.79:1
54T #25 sprocket: 2.84:1
48T #25 sprocket: 2.53:1
Overall: 13.6:1 (54T) or 12.1:1 (48T)

Mid-Freewheels:
Standard: 18T
Options: 16T,17T,19T,20T,21T, 22T,23T

Mid-Sprockets:
Standard (20" rear wheel): 26T
Standard (26", 700C rear wheel): 24T
Options: 28T, 30T

† Mid-Drive reduction gearing is from the motor shaft to the mid-drive spindle. The overall ratio is the ratio of motor shaft speed to mid-drive spindle speed. The mid-freewheel and mid-sprockets turn at spindle speed. The mid-freewheel is driven by the front chain which connects to the bike's crank assembly. The mid-sprocket drives the rear chain which connects to the rear derailleur or internal hub gear assembly. The ratio of mid-sprocket to mid-freewheel tooth counts is a step-up in gearing provided to the rider by the mid-drive which allows for more relaxed high speed cruising. Mid-sprockets and mid-freewheels are standard bike parts available at any bike shop allowing you to easily modify the factory gear ratios. For the fine points of gearing look here.

Battery Systems

Lithium Iron Phosphate

Type: Lithium Iron Phosphate 12-cell, cell balanced.

Capacity:
10, 15, or 20 Ah, rated at 0.2C when new. Actual useable capacity at high currents will be less. Some capacity loss with use and ageing is normal.

Battery Voltage, Fully charged:
approx 43.2V

Typical Voltage:
38.4V, no load

Minimum Battery Voltage:
36.0V, no load. †

Maximum Pulse Discharge Current:
10Ah: 30A
15Ah: 40A (fuse limited to 50A)
20Ah: 60A (fuse limited to 50A)

Continuous Discharge Current:
10Ah: 30A
15Ah: 45A
20Ah: 60A (fuse limited to 50A)

Battery Temperature Range:
Charge: 0C to 45C; Recommend charging at over 10C (50 deg. F)
Discharge: -20C to 70C

Battery Self Discharge:
less than 10% per month

Weight:
10Ah: approx 8 lbs (3.6 kg)
15Ah: approx 11 lbs (5.0 kg)
20Ah: approx 17 lbs (7.7 kg)

Sealed Lead Acid

Type:
Powersonic SLA, 3 12V 10Ah in series.

Capacity:
10.5Ah nominal

Battery Voltage, Fully charged:
approx 40.8V

Typical Voltage:
36.0 no load

Minimum Battery Voltage:
31.5V, no load

Maximum Discharge Current:
>50A

Continuous Discharge Current:
>35A

Battery Temperature Range:
Charge: 0C to 40C
Discharge: -20C to 40C

Battery Self Discharge:
less than 10% per month

Weight:
10Ah: approx 22 lbs (10 kg)