Bafang M620 Ultra (G510) Explained: 2000W vs 2500W and UART vs CANBUS
The Bafang M620 Ultra, also sold as the Bafang G510, is the mid-drive platform behind several of the highest-power bikes we build at Hi Power Cycles. If you are searching for an M620 Bafang motor, you will find two power levels and two communication protocols to choose from. This page is a single reference for how they differ, what each choice means for wiring and displays, and which HPC bikes use the platform.
M620 Ultra and G510: same platform, two names
M620 is the name most riders know, and G510 is the designation that appears alongside it on our product pages, for example "M620 Ultra (G510)". Our upgraded versions are described as having all-metal gearing, an integrated torque sensor, throttle capability and a large, robust motor core. They are sold as bare motors, and they are available in 48V or 52V versions. You tell us which firmware you want flashed before the motor ships.
2000W vs 2500W: what changes
We offer the upgraded M620 Ultra at two performance levels. The specifications below come straight from the product pages.
- 2000W version: 200Nm of torque and a maximum power output of 2000W. The page describes this as over a 33% increase from stock.
- 2500W version: 230Nm of torque and a maximum power output of 2500W. The page describes this as over a 60% increase from stock, and it requires a battery capable of discharging 50A.
That battery requirement is the practical difference to plan around. The 2500W motor is a very powerful system, so the battery, wiring and the rest of the drivetrain need to be matched to it. If you are building your own bike, decide on the battery first and then pick the motor level it can support.
Both versions are bare motors. A wiring harness, speed sensor, display and crank arms are not included and are purchased separately.
UART vs CANBUS: what changes
The protocol is how the motor, controller and display talk to each other. The two are not interchangeable, so you need to know which one your system uses before you order.
- How to tell them apart: look at the display connector. A round connector is UART. A triangular connector means CANBUS.
- Displays: the DPC18 color LCD comes in a UART version for round-plug systems and a CANBUS version for triangle-plug systems. We program the display for you at no charge to match your system. The DP C245 display is a CANBUS option that also lists Bafang Ultra compatibility.
- Controllers: the OEM M620/G510 controllers are also sold in CAN and UART versions, and a CAN controller will not work with a UART system. Our controller guide covers this in detail, including 48V vs 52V.
Why we prefer CANBUS
We recommend CANBUS for most builds. Our product page states that, compared with the UART version, the CANBUS version offers a far superior power delivery and overall experience. In our earlier write-up on Bafang M620 CANBUS vs UART we go through the reasons in more depth: more consistent torque delivery, lower communication error rates with multiple devices connected, and the ability to communicate with compatible smart battery systems.
UART is still a valid choice if you are matching an existing bike or display that already uses the round connector. In that case the motor, controller and display all need to be UART, so the choice is really about what you already own.
Choose your motor
There are four motors, one for each combination of power level and protocol:
- 2000W M620 Ultra (G510), CANBUS (recommended protocol)
- 2000W M620 Ultra (G510), UART
- 2500W M620 Ultra (G510), CANBUS (recommended protocol)
- 2500W M620 Ultra (G510), UART
The motor pages note that these will also fit other brands as an upgraded motor, such as Bakcou, QuietKat, Frey and Nireeka, provided you know whether your bike is UART or CAN.
Which HPC bikes run the M620 platform
These are the HPC bikes that use the M620 mid-drive. Product pages list current power options and availability, so check them for your build.
- Scout: a hand-welded aluminum hardtail offered in 750W Class 1, 1500W and 2000W configurations.
- Scout Pro: a 27.5+ hardtail with a mid-drive rated up to 3000W.
- Titan: a fat-tire hardtail with a mid-drive up to 2000W.
- Titan Pro: a fat-tire hardtail listed at up to 74V and 3,000W.
- MPUV: our utility platform, which runs the Bafang M620 and M630 mid-drive systems in 750W, 2500W and 3500W tiers. The product page currently shows a pre-order offer, so check it for delivery timing.
Our Scout, Scout Pro, Titan and Titan Pro are described in our CANBUS article as running CANBUS. The Trailblazer line is a different platform, built around the M560, and we compare the two motors in Bafang M620 vs M560.
Building your own bike
If you would rather start from a complete integrated system than assemble motor, controller and display yourself, our 2000W mid-drive conversion kit is a separate HPC system. It includes a 48V 17.5Ah USA-made battery, an LCD display, throttle, crank arms and wiring harness. The product page does not state that it uses the Bafang M620, so treat it as an alternative to a bare-motor build rather than the same hardware.
For M620 builds you may also want the 155mm crank arms and the 104bcd spider listed for the Ultra platform.
A note on use
Bikes at these power levels are intended for private land and off-road use. Laws vary by location, so check your local regulations before riding on public roads or trails.
Ready to pick a motor
For most new builds, choose CANBUS, then choose the 2000W or 2500W level based on the battery you can support. If you are unsure whether your existing bike is UART or CAN, email us and we will help you confirm before you order.
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