Bafang M560 Mid Drive Motor Kit: A Sourcing Checklist That Covers Actuators, Roller Chain, and Spur Gears

In my role coordinating emergency parts for e-bike builds and small industrial lines, I’ve handled more than 200 rush parts calls in five years. Most don’t start with a failure. They start with a spec sheet that looks right but isn’t. The motor is correct. The shaft is wrong. The chain pitch is imperial. The actuator is a lead screw when the cycle time demands a ball screw. If that sounds familiar, this checklist is for you.

It’s six checks, in order. It works for a Bafang M560 mid drive motor or a warehouse conveyor sensor retrofit. I’ll use the M560 as the anchor because it’s the motor people ask about most right now, but the process applies to any “quick source” decision.

Check 1: Match the Motor Platform Before You Match the Price

Most buyers focus on torque numbers and completely miss the electrical interface. That’s the outsider blind spot. A bafang-motor drive unit like the M560 needs a matching controller, battery voltage, display protocol, and speed sensor magnet arrangement. The physical mount is only the first layer.

The question everyone asks is “Will this Bafang M560 mid drive motor fit my frame?” The question they should ask is “Does this kit include the controller and display, and are the connectors compatible with my existing harness?” That distinction has caused more than one 2 a.m. panic call.

If you see a Bafang mid drive motor kit for sale with a price that looks too good, check what’s missing. A bare motor is not a kit. A kit with the wrong display protocol is just inventory.

Why does this matter? Because the M560 is a complete system, and the motor is only half the system. Compatibility is the other half. In March 2024, 36 hours before a customer’s deadline, I watched a team unhook a brand-new motor they’d ordered with the correct frame mount but a controller that wouldn’t talk to their display. We cross-shipped another one. The motor was fine. The interface was wrong.

Rule I use: never order a mid-drive motor without confirmation that the control protocol matches the rest of the bike.

Check 2: Define the Motion, Then Choose the Actuator

Here’s where the “drive component” world splits. If you’re replacing a motor, you already know you need rotating power. But frequently the question underneath is linear motion. That’s why I keep a mental list of electric actuator types.

There are four common electric actuator types, and mixing them up costs real money:

• Ball screw actuators – high speed, high precision, lower back-driving resistance. Use when you need repeatable position and fast cycle time.
• Lead screw actuators – lower cost, self-locking when stationary, slower. Use for simple lifting or positioning where speed isn’t critical.
• Belt-driven actuators – fast, quiet, long stroke, limited thrust. Good for pick-and-place, not good for high force.
• Rodless actuators – compact, guided, useful where a rod won’t fit. Not a direct replacement for a rod-style unit.

If you’re building an e-bike, you don’t need an actuator. If you’re sourcing spare parts for a customer’s automated gate or conveyor, you do. I’ve had to ask customers to send a photo of the actuator before advising, because “linear actuator” alone doesn’t tell me if the thread is metric or imperial.

Check 3: Don’t Guess the Gear Type

Someone in the purchasing process is going to ask, “which gear is most likely to use a spur gear?” Usually it’s a maintenance tech trying to source a reduction gear without a part number. The answer is simple: a spur gear is the default in a parallel-shaft gearbox. If the output shaft is parallel to the motor shaft and no direction change is needed, the reducer almost always uses spur gears.

If the gearbox makes a 90-degree turn, you’re looking at a bevel or worm gear. If you need high reduction in a compact package, a planetary gear set. But spur gears show up in the low-speed reduction stages of many mid-drive motors too. That’s not a coincidence—they’re efficient, cheap, and quiet enough when made well.

I should note that “spur gear” doesn’t mean “one gear.” The term describes the tooth shape. So when you see the word on a parts list, check the tooth count and the center distance, not just the name.

Check 4: Choose the Roller Chain by Pitch, Not by Country

The keyword “USA roller chain” gets typed into search boxes a lot. I get it. In my experience, it usually means the buyer wants ANSI-standard roller chain made in the United States. But the reason the country matters is that US manufacturers tend to use ANSI B29.1 dimensions. That standard governs pitch, roller diameter, and width.

For a mid-drive e-bike, chain pitch matters because the chainline interacts with your motor sprocket and rear cassette. For industrial equipment, pitch is even more critical. A #40 chain has a 1/2-inch pitch. A #60 chain is 3/4-inch. If you order by “size” without the number, you’ll get what you get.

What I often tell customers: “USA roller chain” is a good start, but the spec you need is the ANSI chain number. If someone won’t tell you that, assume they don’t know their own inventory. That’s a red flag. At least, that’s the rule I use.

Check 5: Compare Total Cost, Because the Lowest Quote Usually Isn’t

My stance is straightforward: value over price. I’ve been in this role for six years, maybe seven—I’d have to check. The lowest quote has cost more in enough cases to make me stop searching by price first.

Consider the real cost:

• Base price of the Bafang mid drive motor kit for sale
• Shipping time and cost
• Missing parts you’ll need to buy separately
• The time you spend fixing a bad connector or bad bracket
• The cost of the project being late

Last quarter alone, we processed 47 rush orders with 95% on-time delivery. That 95% doesn’t happen because we bought the cheapest components. It happens because we verify compatibility before the order goes out. Sometimes the right part costs $80 more. A rework costs $400 and three days. Simple math.

That $80 difference matters if you’re buying office supplies. It doesn’t matter when a $4,000 install job is waiting on a $200 part.

Check 6: Plan for the Worst Case Before You Need It

This is the step most people skip. We didn’t have a formal fitment checklist for specialty motor orders until it cost us. The third time someone ordered a Bafang mid-drive motor kit without measuring the bottom bracket shell width, I created one. Should have done it after the first.

The checklist is not complicated:

• Bottom bracket shell width and threading
• Chainline offset
• Controller type and display protocol
• Battery voltage and connector polarity
• Throttle compatibility
• Frame clearance for the motor housing

If you’re ordering for a customer, take photos. If you’re ordering for yourself, measure twice. The motor will still be there tomorrow, but the job won’t.

Common Mistakes I See in Rush Orders

One more thing, because these almost never make it into the spec sheet:

Buying the bare motor when you need a kit. A “kit” often includes the display, wiring harness, sensors, and sometimes a thumb throttle. A bare “Bafang M560 mid drive motor” is not a kit. If the ad says “for sale” without “kit,” ask.

Assuming all electric actuator types use the same mounting hole pattern. They don’t. The first time I assumed a 24-volt actuator was a direct replacement for a 12-volt unit, it wasn’t. Different stroke, different feedback. The voltage was the only thing that matched.

Ordering a spur gear by module when the original was diametral pitch. This is a classic. If someone asks “which gear is most likely to use a spur gear?,” the next question has to be “what tooth system?” A module 1 spur gear and a 24-pitch spur gear are different animals.

Ignoring the chain’s width. “USA roller chain” is a phrase, not a width spec. Always get the pitch and strand number.

I knew I should ask for the chain’s exact designation before ordering a replacement once. I thought, “It’s a standard roller chain, what are the odds?” The odds caught up with me. It was a duplex chain, not single. Cost an extra day and a return fee.

That’s the checklist. Motor platform first, motion type second, gear geometry third, chain spec fourth, total cost fifth, and a fitment checklist sixth. Do those in order and most of your rush jobs will go from “adrenaline” to “boring.” I’ll take boring.