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:
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.
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.
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.
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)
Max wattage: 5000
Max motor current: 92 amps
Max torque: 7+ nm
Max torque output: 100nm
Pulley: GT3, Sprag engagement
Clutch: 10t, Sprag engagement
Parts: Aluminum GT3 40t pulley, all steel internal gears, gun-blued 4130 clutch
Make: Accelerated Systems
Max Voltage: 72v
Max wattage: 5000w
Max battery current: 90 amps
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
Notes: Can be bolted on, or strapped on for easy swapability/portability.