Bafang BBSHD to ASI BAC 855 Wiring Harness Kit – Phase & Hall Sensor Cables

This Bafang BBSHD to ASI BAC 855 wiring harness is a connection cable set built to link the Bafang BBSHD mid-drive motor to the ASI BAC 855 controller. The kit includes three motor phase cables and one Hall sensor signal cable. It fits the BBSHD motor and the BAC 855 controller specifically. Please note that this listing covers cables only – no motor and no controller are included.

The Bafang BBSHD is a 1000 W class mid-drive motor mounted at the bicycle bottom bracket. The ASI BAC 855 is a sinusoidal controller built by Accelerated Systems Inc. Because these two parts come from different manufacturers, their factory connectors do not match each other. That mismatch is exactly why this harness exists.

Consequently, these cables are aimed at e-bike builders and tuning enthusiasts. They are especially useful for riders replacing the stock BBSHD controller with a programmable ASI unit. Workshops assembling higher-power mid-drive systems also rely on this kit.

Key Benefits

• Exact pairing – made specifically for the Bafang BBSHD and ASI BAC 855 combination, not for universal use.
• Motor phase cables – carry three-phase power from the controller into the BBSHD motor windings.
• Hall sensor cable – passes rotor position signals from the motor to the ASI BAC 855 controller.
• No soldering required – connectors are factory fitted, so the stock BBSHD loom stays intact.
• Built for controller swaps – lets you drop the stock BBSHD controller and move to sinusoidal control.
• Complete cable set – every connecting lead ships in one package, so nothing needs sourcing separately.
• E-bike specific part – designed for bicycle electrification systems rather than motorcycles.
• Current headroom – the cables match the current demand of the BBSHD and BAC 855 pairing.

Who Is This For?

These cables join the Bafang BBSHD motor to the ASI BAC 855 controller. That is the single compatibility pairing this kit is built around. In addition, the harness suits closely related ASI BAC series controllers that share the same phase and signal connectors.

Riders converting a BBSHD build to sinusoidal control are the primary audience. Furthermore, the kit serves builders who want full parameter tuning on a mid-drive setup. Bike shops assembling custom high-power drivetrains use it as a standard fitting part.

The typical use case is a straightforward controller swap. You remove the factory BBSHD controller and fit the ASI BAC 855 instead. As a result, you gain higher current, smoother sinusoidal control and complete parameter adjustment. The motor then runs quieter and more evenly than it does on the stock controller.

Package Contents

• Motor phase cables – three leads running between the BBSHD motor and the ASI BAC 855.
• Hall sensor cable – one signal lead fitted with its connector.

Technical Specifications

Why Choose This Harness?

The factory BBSHD connectors simply do not line up with ASI BAC 855 connectors. Without the right cables, you would have to solder every joint by hand. This kit removes that work entirely.

Moreover, these leads target one specific pairing rather than any motor with any controller. The phase and Hall sensor connectors therefore match the terminals on both sides. That precision also prevents miswiring during installation.

The package covers both power and signal duties in a single purchase. However, these are not extension leads. They are adapter connection cables that sit between the motor and the controller.

Frequently Asked Questions

Which motor and controller do these cables fit?

• They connect the Bafang BBSHD mid-drive motor to the ASI BAC 855 controller.
• The BBSHD mounts at the bicycle bottom bracket.
• The BAC 855 is a sinusoidal controller from Accelerated Systems Inc.

Does this kit include the motor or the controller?

• No. The package contains cables only.
• The BBSHD motor is purchased separately.
• The ASI BAC 855 controller is purchased separately.

What exactly is in the package?

• Three motor phase cables for the three-phase connection.
• One Hall sensor signal cable with its connector.

Do I need to solder anything?

• No. The connectors are fitted at the factory.
• You do not need to cut the stock BBSHD wiring.

Will these cables work with other ASI BAC controllers?

• Yes, they suit nearby ASI BAC series controllers with identical phase and signal connectors.
• The ASI BAC 855 remains the pairing the kit is designed around.

Why do I need a harness at all?

• Bafang and ASI use different factory connectors.
• The two sides cannot be joined without an adapter set.
• This kit bridges the BBSHD motor outputs to the BAC 855 controller inputs.

What changes after the controller swap?

• Higher current becomes available to the motor.
• Sinusoidal control makes power delivery smoother.
• Full parameter tuning becomes possible.
• The motor runs quieter and more evenly than on the stock unit.

Are these extension cables?

• No. They are adapter connection leads between motor and controller.
• Their purpose is connector matching, not adding length.

This harness turns a BBSHD controller swap into a plug-in job rather than a soldering project. Both the three-phase power leads and the rotor position signal lead arrive in one package, matched to the terminals on the motor and on the ASI BAC 855. For anyone building a tunable mid-drive e-bike around the BBSHD, it is the connection layer that makes the pairing work.