The BBS-HD 1000W kit bolts Bafang's heavy-duty mid-drive into an ordinary bottom bracket and drives the chain through your own gears. It comes in three shell widths, with or without a battery, and with a choice of display, so the order you place decides the bike you end up with.
Open a BBS-HD 1000W kit and the motor is the heavy lump, but the small parts decide whether the bike rides on day one. The kit carries the drive unit, a chainwheel, brake levers with motor cutoff, a thumb throttle, a speed sensor and a headlight. The tools to strip the old drivetrain come too: a wrench, a crank removal tool and a bottom bracket remover.
What changes between versions is power, voltage, shell width, display and battery. Pick carefully, because two of those choices swap the motor itself.
| Choice | Options | What it changes |
|---|---|---|
| Power | 500W, 750W, 1000W | 500W and 750W are the smaller BBS02B; only 1000W is the BBS-HD |
| Voltage | 36V, 48V, 52V | The HD runs on 48V or 52V; 36V belongs to the smaller motors |
| Shell width | 68–73mm, 100mm, 120mm | Axle length and mounting hardware |
| Display | None, CAN displays, C18 or 860C | Protocol and how you change settings |
| Battery | None, 48V 13–20Ah, 52V 20Ah | Whether the kit rides out of the box |
A UART kit bought without a display will not even switch on until you fit a bypass plug and program a fixed assist level, and you lose speed, battery and error readouts. For almost every build, order the display with the kit so the protocols match.
The 68mm version sold with a C18 or 860C display is the UART build, the classic system most aftermarket parts are made for. The CAN-bus kit is the newer protocol with app and on-screen programming.
| Spec | Value |
|---|---|
| Motor | Bafang BBS-HD (model G320), 1000W rated |
| Other power options | 500W and 750W, both BBS02B motors |
| Torque | Up to 160 N·m at 1000W; 120 N·m at 750W; 100 N·m at 500W |
| Top speed | Up to 45 km/h (maker figure) |
| Battery voltage | 48V or 52V; 36V on some smaller-motor versions |
| Battery connector | XT60 male on the motor lead |
| Battery options | None, 48V 13/16/18.2/20Ah or 52V 20Ah |
| Bottom bracket width | 68–73mm, 100mm or 120mm versions |
| Bottom bracket inner diameter | 33.5–36mm (JIS) |
| 73mm shells | Longer screws needed, not included in every version |
| Brake compatibility | Disc or V-brake; chain-driven bikes only |
| Riding modes | Throttle, pedal assist, unassisted cycling |
| Display | Optional: VD03, EKD01, VD04, VD618, VD18MT, DP C010, DPC080; C18 or 860C on the UART 68mm version |
| Controls in the box | Brake levers with motor cutoff, thumb throttle, speed sensor |
| Drivetrain parts | Chainwheel |
| Lighting | Headlight |
| Tools included | Wrench, crank removal tool, bottom bracket remover |
| Motor housing | Aluminium |
| Warranty | 365 days repair or replace |
Shell width is the decision you cannot fix later. The 68–73mm version covers most mountain, city and hybrid frames, while the 100mm and 120mm versions exist for fat bikes with wide shells. The inner diameter must fall between 33.5mm and 36mm, the JIS threaded size, so the motor's tube slides through the shell.
Take a caliper to the bare shell with the old bottom bracket removed. Measure the width across the faces and the bore inside the threads, then match both numbers to a version.
Most current 1000W versions pair the motor with Bafang's CAN display range. The 68mm version with a C18 or 860C screen is the UART one, and it opens the door to cheaper third-party displays, harnesses and light kits.
Garage steps, lockring torque and harness routing are laid out in order in the install guide. Fat-bike builders should read the 100mm and 120mm fit notes before ordering.
Rated at 1000W with up to 160 N·m of claimed torque, the BBS-HD pulls a loaded bike up grades where a hub motor slows to walking pace. The motor turns the chainring, so the power runs through your cassette, and a low gear keeps the motor spinning fast and cool on a long climb. That gearing advantage is the reason riders choose a mid-drive for hills and cargo.
Heat is the real limit. Bafang's 1000W HD boards are 30A units, and a 52V pack at 30A feeds well over 1000W into the motor on a fresh charge. Hold that on a twenty-minute grade in a high gear and the windings soak up heat faster than the case can shed it.
Battery pairing matters as much as the motor. The kit expects 48V or 52V through an XT60 plug, and the pack's BMS has to deliver 30A continuously without tripping. The optional packs run from 48V 13Ah to 52V 20Ah; the bigger ones give more range and less sag at the end of a ride.
The 48V vs 52V battery guide compares voltage and discharge ratings. Current limits, assist levels and throttle behaviour are covered in programming the BBSHD, and real power and top-speed figures sit in the 1000W explainer.
In the United States, most states follow the three-class e-bike system, and all three classes cap the motor at 750W. A 1000W BBS-HD falls outside those classes, so in most states it is not a legal e-bike on public roads and bike paths. Private land and off-road riding where motors are allowed are a different matter.
Some riders program the motor down to a lower current and limit its speed. That changes how the bike rides, but the motor is still rated 1000W, so whether a lower setting counts legally depends on your state. Check local rules before commuting on it.
Walk the donor bike through a short checklist first. Ten minutes with a caliper and a torch saves a return shipment of a heavy box.
If road legality outranks climbing power, the 750W BBS02B option inside this same family is the lawful choice, and the BBS02 vs BBSHD comparison weighs heat against weight. Riders who want a pack, display and motor from one box should look at the kit with battery.
Yes, the 68–73mm version covers it, but a 73mm shell needs longer screws that some versions leave out. Check your version or order the screws with the kit.
No. The 500W and 750W choices are BBS02B motors, a smaller unit. Only the 1000W option is the BBS-HD.
Yes, if it is 48V or 52V, has an XT60 plug or an adapter, and its BMS handles 30A continuous. Order the no-battery version.
In most states, no. The three-class e-bike laws cap the motor at 750W, so a 1000W kit is generally limited to private land or off-road areas where motors are permitted.
Match the protocol. CAN versions take Bafang CAN displays like the DP C010 or DPC080; the UART 68mm version comes with a C18 or 860C and works with other 5-pin UART screens.
