Original price was: £415.90.£369.90Current price is: £369.90.
The BAFANG mid drive 750W UART motor delivers strong performance, smooth pedal assist, and easy tuning through Bafang UART communication. Compatible with the BBS02B 750W system, it offers reliable power, efficient 48V operation, and simple installation for powerful e-bike upgrades.
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The BAFANG mid drive 750W UART is the BBS02B platform — the most widely deployed high-performance mid drive motor in the e-bike conversion market and the benchmark against which every competing 750W system is measured. Built around a 48V geared brushless motor producing up to 160Nm of maximum torque, the BAFANG mid drive 750W UART is a compact, bottom bracket mounted conversion unit that uses your existing drivetrain, benefits from every gear ratio on your bike, and delivers a riding experience that no hub motor at any comparable wattage can match. This is a Bafang 750W system for builders who want the full performance envelope of a mid drive conversion — tunable, powerful, proven, and built to last across years of hard use.
The headline specification for the BAFANG mid drive 750W UART is not the wattage — it’s the torque. At 160Nm maximum effective torque, the BBS02B produces more rotational force at the crank than virtually any hub motor regardless of power rating. This is a direct result of the mid drive architecture: the geared motor operates at high RPM internally, steps that speed down through a reduction ratio of 1:21.9 at the motor output, then sends that amplified torque through your bicycle’s own chainring, chain, and cassette — adding another gear multiplication stage before power reaches the rear wheel. The practical result is a Bafang mid drive system that climbs steeper gradients with heavier loads, accelerates harder from low speed, and maintains a useful power output in conditions where hub motors overheat and fade. This is not a 750W motor that performs like a 750W hub motor — it performs at a level that far exceeds its rated wattage suggests.
The UART communication protocol is what separates this BAFANG mid drive 750W UART from the CAN bus variant and defines its appeal to the DIY builder community. UART is the original Bafang serial communication standard — mature, widely supported, and compatible with the broadest range of third-party displays, programming cables, and configuration software. Using the Bafang configuration tool over a USB programming cable, every operational parameter of this Bafang motor can be adjusted: assist level power curves, speed limits, current limits, PAS sensitivity, throttle response curves, and wheel diameter calibration. The level of control available through UART programming transforms the BBS02B from a fixed-output motor into a fully customisable power system tuned precisely to your riding style, your terrain, and your battery configuration.
Display compatibility under UART covers the full range of Bafang display options. This kit is available with the DZ41 — a clean, functional LCD unit delivering speed, battery level, assist mode, and trip data — or the 850C, a full-colour backlit display with richer data presentation and a premium interface that suits performance-oriented builds. Both connect directly to the BBS02B UART controller with no adapter required.
The BAFANG mid drive 750W UART fits bottom bracket shells with a width of 68–73mm and uses the JIS/BSA threaded standard — the most common bottom bracket format across road bikes, mountain bikes, hybrid frames, city bikes, and most steel and aluminium frame platforms. For frames with bottom bracket widths exceeding 73mm, contact us before ordering to confirm fitment options. The BBS02B axle diameter of 33.5mm is specific to the BAFANG BBS mid drive family.
The Bafang ebike mid drive 750W BBS02B is a 48V system and is also fully compatible with 52V battery packs — the higher voltage increases peak power output and sharpens throttle response while reducing current draw at equivalent output levels. When ordering this kit, battery packs are available in the following configurations: Downtube 48V 20Ah, Downtube 52V 20Ah, Downtube 52V 25Ah, Triangle 48V 20Ah, Triangle 52V 20Ah, and Triangle 52V 28Ah. Triangle battery formats offer higher capacity in a frame-integrated profile that keeps the centre of gravity low and centralised — the ideal pairing for a mid drive system. For the full battery range and specifications, visit the Batteries category page.
The Bafang mid drive architecture sends motor power through the bicycle’s existing gears before it reaches the ground. In low gear on a steep climb, the motor benefits from the same mechanical advantage that makes the climb manageable for the rider — torque multiplication through the cassette ratios. In high gear on a fast flat road, the motor operates at higher RPM with lower current draw, keeping thermal load low and efficiency high. A hub motor has no access to these gear ratios. The mid drive uses all of them, which is why the BAFANG mid drive 750W UART climbs steeper hills, runs cooler under sustained load, and conserves battery capacity more effectively than a hub motor at the same or higher wattage rating.
At 4.8kg mounted at the bottom bracket — the lowest, most central point of the frame — the Bafang 750W BBS02B adds its weight in the optimal position for balanced handling. Hub motors add equivalent or greater weight to the rear axle, shifting the bike’s mass distribution rearward and affecting steering feel and traction under hard acceleration. The mid drive placement keeps both the centre of gravity and the weight distribution close to what a standard bicycle provides — the bike handles naturally even at 750W output.
The BBS02B supports gear sensor functionality — a component that detects when the rider is changing gear and momentarily cuts motor power during the shift to protect the drivetrain from the stress of shifting under full load. At 160Nm of motor torque, shifting without a gear sensor cut-off accelerates chain, cassette, and chainring wear significantly. Gear sensor integration extends drivetrain life substantially and is a feature that distinguishes a properly set-up Bafang ebike mid drive 750W system from a basic hub motor installation.
The BBS02B 750W UART is the mid-tier performance unit in the Bafang mid drive family — substantially more powerful than the entry-level BAFANG 250W, and more compact and lighter than the top-tier BAFANG BBSHD 1000W. It is the most versatile unit in the range — powerful enough for demanding terrain and heavy builds, compact enough to fit a wide range of frames without modification. For the complete overview of all mid drive and hub motor conversion options, visit the Conversion Kit category page.
| Spec | Detail |
|---|---|
| Motor Type | Geared brushless mid drive (BBS02B) |
| Protocol | UART |
| Rated Power | 750W |
| Peak Power | Up to 1470W |
| Nominal Voltage | 48V (52V compatible) |
| Max Torque | 160 Nm |
| Motor RPM | 130–150 RPM |
| Reduction Ratio | 1:21.9 |
| Efficiency | ≥85% |
| Weight | 4.8 kg |
| Bottom Bracket Width | 68–73mm (JIS/BSA) |
| Supported Wheel Size | 20–29 inch |
| IP Rating | IP65 |
| Noise | <55dB |
| E-Brake | Yes |
| Gear Sensor | Yes |
| Throttle | Yes |
| Display Options | DZ41 / 850C |
| Certifications | CE / UL / ROHS / EN 14764 |
The BAFANG mid drive 750W UART is the complete, high-performance conversion kit for builders who want the full mid drive advantage — 160Nm of torque, full UART programmability, IP65 weatherproofing, gear sensor support, and a proven Bafang motor platform trusted by builders worldwide. This is what a serious Bafang ebike mid drive 750W conversion looks like — fully specified, fully tunable, and built to perform hard for years.
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