BAFANG Mid Drive 750W UART — 160Nm High-Torque Conversion Kit

The BBS02B Platform — Benchmark Mid Drive Performance

The BAFANG mid drive 750W UART runs on the BBS02B platform — the most widely deployed high-performance mid drive motor in the e-bike conversion market, and the benchmark every competing 750W system is measured against. Built around a 48V geared brushless motor producing up to 160Nm of maximum torque, it’s a compact, bottom-bracket-mounted conversion unit that uses your existing drivetrain and benefits from every gear ratio on your bike — a riding experience no hub motor at any comparable wattage can match. This is the full performance envelope of a mid drive conversion: tunable, powerful, proven, and built to last across years of hard use.

Why the BAFANG Mid Drive 750W UART

160Nm — The Torque Figure That Changes Everything

The headline specification here isn’t 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. That’s a direct result of the mid drive architecture: the geared motor operates at high RPM internally, steps that speed down through a 1:21.9 reduction ratio at the motor output, then sends the amplified torque through your bicycle’s own chainring, chain and cassette — adding another gear-multiplication stage before power reaches the rear wheel. The result climbs steeper gradients with heavier loads, accelerates harder from low speed, and keeps useful power output in conditions where hub motors overheat and fade. This isn’t a 750W motor that performs like a 750W hub motor — it performs well beyond what its rated wattage suggests.

UART Protocol — Full Programmability and Display Compatibility

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 motor can be adjusted: assist-level power curves, speed limits, current limits, PAS sensitivity, throttle response curves and wheel diameter calibration. That level of control turns the BBS02B from a fixed-output motor into a fully customisable power system tuned to your riding style, terrain and 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 showing speed, battery level, assist mode and trip data — or the 850C, a full-colour backlit display with richer data presentation for performance-oriented builds. Both connect directly to the BBS02B UART controller, no adapter required.

Bottom Bracket Compatibility

The BAFANG mid drive 750W UART fits bottom bracket shells 68–73mm wide using the JIS/BSA threaded standard — the most common format across road bikes, mountain bikes, hybrid frames, city bikes, and most steel and aluminium frames. For frames with bottom bracket widths exceeding 73mm, contact us before ordering to confirm fitment. The BBS02B axle diameter is 33.5mm, specific to the BAFANG BBS mid drive family.

Battery Options — 48V and 52V Compatible

The Bafang 750W BBS02B is a 48V system, fully compatible with 52V battery packs — the higher voltage increases peak power and sharpens throttle response while reducing current draw at equivalent output. 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. Available battery configurations for this kit:

For the full battery range and specifications, visit the Batteries category page.

Mid Drive Vs Hub Motor — Why It Matters at 750W

Gear Multiplication — The Technical Advantage

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 runs 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.

Weight Distribution and Handling

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 mass distribution rearward and affecting steering feel and traction under hard acceleration. Mid drive placement keeps the centre of gravity close to what a standard bicycle provides — the bike handles naturally even at 750W output.

Gear Sensor Integration

The BBS02B supports gear sensor functionality — it detects when the rider is changing gear and momentarily cuts motor power during the shift to protect the drivetrain from stress 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 what distinguishes a properly set-up Bafang 750W system from a basic hub motor installation.

Where the 750W UART Sits in the Bafang Range

The BBS02B 750W UART is the mid-tier performance unit in the Bafang mid drive family — substantially more powerful than the entry-level BAFANG mid drive 250W, and more compact and lighter than the top-tier BAFANG BBSHD 1000W. It’s 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.

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 750W conversion looks like — fully specified, fully tunable, and built to perform hard for years.