The High-Drive Ebike system

The High-Drive (patent pending) is a fully modular ebike motorization system utilizing a drivetrain independent of the bottom bracket of the bicycle. The High-Drive instead runs the power of the motorization system through a special frame component called an "upper bracket." The system offers four major advantages in comparison to mid-drives:

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1. Serviceability: Because the High-Drive is modular, you can work on or upgrade one of its components without having to take apart the whole system. This makes it relatively easy to work on.

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2. Customizability: The first-stage of the reduction system is easily accessible on the side of the bike, and can be adjusted to change the overall top speed/max torque of the bike. All you need is a single M3 allen wrench. Also, the bottom bracket can be made to common bicycle standards on a High-Drive. So can the rear dropouts. This makes High-Drive bikes compatible with your favorite off-the-shelf cranks, chainwheels, hubs, chains, etc.

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3. High efficiency: The unique drivetrain requires far less motor reduction than mid-drive designs. All else being equal, the lower the reduction ratio, the higher the mechanical efficiency.

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4. High power-to-weight ratio: The High-Drive allows a lighter weight reduction system than mid-drives in the same power range, and also does not require the additional weight of encasement, given that it is encased within the custom frame design itself. This results in a lighter weight system overall. We routinely run our BMX High-Drive at 3800 watts max, ~1500 watts continuous, and yet the entire system is 6.9lbs including the 1/8" chain.

Our High-Drive on a BMX

Max power: 3800 watts
Total motor reduction:
15.9:1
Max wheel torque (stock):
110+nm
Weight of system:
6.9lbs (including chain)

Motor

Design: Inrunner
Magnets: Neodymium
Max wattage: 5000
Max motor current: 92 amps
Kv: 120
Kt: .07662
Max torque: 7+ nm
Weatherproofing: IP53
Weight: 3.3lbs

Transmission

Design: 2-Stage
Max torque output:
100nm
Pulley:
GT3, Sprag engagement
Clutch: 10t, Sprag engagement
Weatherproofing:
IP65
Weight:
2.7lbs
Parts: Aluminum GT3 40t pulley, all steel internal gears, gun-blued 4130 clutch

Controller

Make: Accelerated Systems
Model:
BAC855
Max Voltage:
72v
Max wattage:
5000w
Max battery current:
90 amps
Weatherproofing:
IP65
Weight:
0.73lbs

Battery

Nominal Voltage: 52v
Max current:
90 amps
Amp hours:
8.4ah/494 watt hours
Cells:
Molicel P42a
Connection:
Overmolded XT-90
Materials:
Potted/aluminum encased
Weatherproofing:
IP65
Weight:
6.9lbs

Notes:
CanĀ  be bolted on, or strapped on for easy swapability/portability.