BAFANG M625 48V 750W Mid Drive Kit review

Have you ever thought about turning your regular bike into a high-performance electric ride with a mid-drive kit that balances power and control?

My First Impressions of the BAFANG 48V 750W 100MM Mid Drive Kit M625 Ebike Conversion Kit with 46T Chainwheel Electric Bike Conversion Kit Mountain Bike Road Bike with Display Optional & Battery

I unboxed this kit with curiosity and a bit of excitement, because BAFANG has a strong reputation in the e-bike world. Right away I noticed that the kit aims to be powerful without being abrupt, thanks to the updated acceleration program BAFANG included for the M325/M625 motors.

I appreciated the thoughtful marketing that emphasized smoother starts and moderated power delivery. I felt reassured that the motor wouldn’t punch me forward the second I hit the throttle, but I could still feel the muscle when I needed to climb or accelerate.

Why I chose to test this kit

I wanted a conversion that could handle both my city commute and steeper weekend rides without requiring a full e-bike purchase. I needed something that would install on a typical mountain or hybrid frame and would allow me to keep a battery I already owned if that was preferable.

I also wanted the option to choose a display and battery configuration rather than being locked into a single proprietary ecosystem. This kit’s flexibility was one of the reasons I decided to give it a thorough test.

Specification Breakdown (Quick Reference)

I like having a compact spec sheet to reference; it helped me set expectations before riding. Below is a clear breakdown of the main specs as presented by the manufacturer and by my testing notes.

Feature	Details
Product Name	BAFANG 48V 750W 100MM Mid Drive Kit M625 Ebike Conversion Kit with 46T Chainwheel
Motor Options	M325 / M625 (48V/52V available; 500W / 750W / 1000W options)
Chainwheel	46T chainwheel included
Bottom Bracket Fit	68-73mm length; inner diameter 33.5-36mm; JIS standard
Compatibility	Chain-driven bikes only; disc or V-brake compatible
Battery Options	48V (13Ah/17.5Ah/19.2Ah/20Ah), 50.4V20Ah, 52V20Ah; allows third-party batteries
Top Speed	Up to ~45 km/h (manufacturer note; depending on configuration and local limits)
Modes	Throttle, Pedal Assist (PAS), Standard cycling
Displays (optional)	VD03, DPC010, DCP080, P860ML, VD618, EKD01
Special Features	Moderate acceleration program, robust torque for climbing
Notes	73mm screws not included; contact seller if needed

I kept this table handy during the install and while riding so I could cross-check behavior with the specs.

Fit and Compatibility: Will it Fit My Bike?

I checked my bike’s bottom bracket dimensions before ordering, because compatibility is one area where mid-drive kits can be finicky. The kit fits bottom brackets with shell widths from 68mm to 73mm and inner diameters between 33.5mm and 36mm following JIS standards, which covers many mountain bikes and hybrids.

I made sure my bike had a chain drive and either disc or V-brakes; the kit is not meant for belt drive bikes or those with non-standard bottom bracket shells. If you have a 73mm shell, note that the kit may not include the longer screws, so I personally reached out to the seller ahead of time to confirm hardware.

What to measure and check before buying

I measured the bottom bracket shell width and inner diameter with calipers and verified my frame used JIS standard cranks. I also looked at clearance for the chainring and motor housing to ensure nothing would hit the frame or bottle cages during installation.

I recommend checking your chainline, rear derailleur compatibility, and frame reinforcement around the bottom bracket area. I found that frames with thinner tubing around the BB still worked fine, but it’s helpful to confirm clearance to avoid surprises.

Installation Process: Tools, Time, and Tips

I took my time during the install and treated it like a small mechanical project rather than a rushed swap. With basic bike tools, a torque wrench, and patience, the installation for me took a few hours because I wanted clean cable routing and proper torque settings.

BAFANG’s instructions were serviceable, but I relied on online community videos and my own bike mechanic experience for audio-visual clarity on specific steps. If you’re not mechanically confident, I recommend having a professional bike shop do the install to make sure everything is aligned and reliable.

Step-by-step overview of my install

I removed the cranks and bottom bracket, checked the BB shell dimensions, installed the mid-drive motor into the shell, secured the 46T chainwheel, routed cables for the chosen display, and mounted the battery. I adjusted the chainline and B-tension on the rear derailleur to account for the different chainring size.

I also calibrated the PAS and throttle mapping on the display so the acceleration felt natural to me. After an initial short ride, I rechecked bolts and cable routing, which is a good habit when doing any conversion.

Motor Performance: Power, Smoothness, and Real-World Feel

I was impressed by the balance between power and control in the M625. The motor provides strong torque that makes hill climbing feel much easier than with a hub motor of similar wattage. But I also noticed the moderate acceleration program; the motor ramps up power smoothly instead of launching aggressively.

During steady-state rides on flat roads, the system was composed and responsive without being jerky. When I needed bursts of power — for example, to overtake or climb a steep pitch — I could call on the motor with confidence.

How the acceleration program affected my ride

Because BAFANG added a moderated acceleration profile, I felt more confident in traffic and in tight trail conditions. The power comes in predictably, so I could control momentum better rather than being surprised by sudden surges.

I think this programming is especially beneficial if you’re converting to electric from a non-powered bike; it reduces the learning curve and gives you safer, more comfortable starts.

Climbing Ability and Torque: Where the Kit Shines

Climbing steep streets was one of the biggest improvements I noticed. The mid-drive location means the motor works through the bike’s gears, so I could shift to an easier gear and let the motor spin at an efficient cadence for climbing.

I found that even at moderate assist levels, the torque helped me maintain traction and forward motion on grades that used to force me to walk the bike.

Gear selection and motor synergy

I learned that pairing the motor’s torque with proper gear choice matters. I used low gears on steep climbs to keep the motor RPM in an efficient range and to reduce strain on the chain and drivetrain.

I also observed that a 46T chainwheel combined well with my cassette range. If you have a very large chainring cogs or a narrow cassette spread, you may want to tweak gearing or consider a different chainring size for ideal cadence balance.

Battery Options and Range: Choosing What Fits My Needs

One of the aspects I appreciated was BAFANG’s removal of strict communication protocol restrictions for batteries. I was able to pair the kit with a few different battery sizes and even an older battery I had, without needing a proprietary pack.

I tested with a 48V 20Ah pack and saw substantial range; real-world distance varies with rider weight, level of assist, terrain, and riding style. For my mixed urban and hilly riding, the 20Ah battery provided multiple long rides between charges.

Range expectations and real-world numbers

In moderate pedal-assist use with mixed urban and hill segments, I averaged range estimates similar to what other riders report for similar battery sizes. On mostly flat commutes with conservative PAS, I could expect longer distances. If you ride mostly on high-power assist or at top speeds, range will drop noticeably.

I recommend matching battery capacity to your riding style: 13Ah or 17.5Ah for shorter commutes, 19.2Ah to 20Ah for long commutes or day trips, and consider 50.4V or 52V packs if you want higher top speed and better climbing performance in high-demand situations.

Display Options and Controls: Which One I Liked Best

I tried a couple of the optional displays: the DPC010 and the VD618, and I found the ability to choose a display valuable. Each display has a different information layout and button configuration, so I picked the one that gave me the clearest readout while riding.

The DPC010 felt intuitive and provided clear PAS levels, battery percentage, speed, and trip data. The VD618 offered a more compact interface but still provided the essential info I use while riding.

Why display choice matters to me

I care about readability at a glance and ease of changing assist levels while keeping my eyes on the road. Different displays also expose different configuration options, like throttle behavior and PAS sensitivity, which let me tailor the kit to my ride style.

If you prefer a minimal interface or a richer data readout, pick the display that matches your priorities and test it before committing to rides where display readability is critical.

Throttle, Pedal Assist, and Riding Modes

Having throttle, pedal assist, and standard cycling modes gives me flexibility. Throttle is handy for starting quickly from a stop or for short bursts of power, while PAS is my go-to for longer rides since it conserves battery and integrates with my pedaling.

I used a moderate PAS level for daily commuting and switched to higher levels on steep climbs or when I wanted less effort. The kit’s three primary modes cover most scenarios I encounter.

How I used modes for different situations

For crowded city streets, I used low PAS and only tapped throttle for short accelerations. On long climbs, I bumped to a higher PAS and let the motor sustain my speed without burning through battery too fast.

I also appreciated the ability to ride in standard pedal-only mode when I wanted exercise or to save battery, making the system feel versatile rather than forcing electric use.

Noise and Smoothness: How Quiet Does It Run?

I noted that the M625 runs relatively quietly compared to some hub motors, which I appreciated during quiet morning rides. Mechanical chain noise and drivetrain whine remain present, but the motor itself didn’t add much intrusive sound.

The smooth power delivery translates into a subdued auditory footprint, which makes rides more pleasant on scenic routes or neighborhood streets.

What to expect long-term

Motor bearings and gears may produce more sound over time depending on load and maintenance, so I check mounting bolts and keep moving parts lubricated. I found minor noises easily addressed by tightening bolts and adjusting chain tension, which kept the system feeling premium.

Braking Compatibility and Safety Considerations

Because the kit is compatible with both disc and V-brake systems, I made sure my brakes were well-serviced before increasing speeds on my rides. Faster, assisted speeds elevate the importance of quality braking and proper brake pads.

I also mounted reflectors and checked lights to maintain visibility and safety. When converting to a higher-speed capable setup, I personally upgraded to more heat-resistant brake pads and bled my hydraulic brakes for consistent stopping power.

Tips for safer operation

I learned to anticipate stopping distances at higher speeds and to downshift before heavy braking zones to use engine braking via the drivetrain when possible. Regular brake checks and ensuring rotor alignment are part of my routine now that I ride faster.

Maintenance: What I Do to Keep It Running

I treat the mid-drive kit like another mechanical component that needs regular attention. I check torque on motor mounting bolts, clean and lube the chain frequently, and inspect wiring for chafing after the first few rides.

Because the motor uses the bike’s gears, drivetrain wear is slightly more pronounced under heavy assist; I maintain my cassette, chain, and chainring proactively to avoid premature failure.

Recommended service intervals from my routine

I do a quick visual inspection weekly after heavy use, clean and lube the chain every 150–250 km depending on conditions, and perform a deeper check every 500–1000 km to re-torque fasteners and inspect wiring. If I ride in wet or salty conditions, I shorten these intervals.

Installation Challenges I Encountered and How I Solved Them

I ran into a few minor fit issues with cable routing and chainline. My frame had limited space for tidy wiring, so I used zip ties and protective tubing to route cables cleanly without rubbing.

Also, the kit didn’t include 73mm screws in my package, so I had to order the longer screws separately. I reached out to the supplier and they were responsive; for others, confirm screw inclusion before installation if your BB shell is 73mm.

Helpful tricks I used

I used a steel washer under the motor clamp for a snug fit on slightly ovalized BB shells. For cable routing, I used spiral wrap to keep cables together and to reduce chafing against the chainstay.

I also kept the original bottom bracket components as backups in case I needed to revert the bike quickly.

Legal and Speed Considerations

I checked local e-bike regulations before testing the kit at higher speeds because many jurisdictions limit e-bikes to certain power and speed thresholds. While the kit can reach speeds up to 45 km/h with appropriate voltage and configuration, I kept my setup within local legal limits during public road use.

If you plan to configure the motor for higher speeds, consider local laws for classification, registration, and helmet requirements.

How I balanced performance and compliance

I configured PAS levels and top-speed settings on the display to keep the system within legal speed limits for most of my riding. For off-road or private property use, I used higher assist settings where permitted, but always with appropriate protective gear.

Pros and Cons from My Perspective

I like to list what stood out to me after weeks of use so readers can quickly see strengths and weaknesses. The kit has a lot going for it, but there are tradeoffs.

Pros:

• Powerful mid-drive torque that makes climbing easier.
• Smooth, moderated acceleration program for safer starts.
• Flexible battery compatibility — not locked to proprietary packs.
• Multiple display options to match rider preference.
• Fits a wide range of bottom bracket dimensions (68–73mm; 33.5–36mm ID).

Cons:

• Installation can require attention to chainline and cable routing.
• 73mm screws may not be included, creating extra ordering steps.
• Drivetrain wear can increase under heavy assist; maintenance required.
• Riders must ensure legal compliance for speed/power in their area.

I think the pros outweigh the cons, but the cons are practical and solvable with proper preparation.

Who I Think This Kit Is Best For

I recommend this kit to riders who want a serious power boost without buying a complete e-bike. If you have a compatible bike frame and some mechanical skills (or access to a bike shop), I think the BAFANG M625 kit is a solid choice.

It’s great for commuters who need reliable hill-climbing and flexible battery options, as well as leisure riders who want to convert a mountain bike for mixed-terrain use. If you primarily ride on very rough singletrack, you may want to consider frame clearance and chain protection.

Who should probably look elsewhere

If your bike is belt-drive, internally-geared hub, or uses a non-standard bottom bracket, this kit won’t fit. Riders who want a plug-and-play hub-motor simplicity might prefer a hub conversion kit instead of a mid-drive.

Also, if you want a kit with a single proprietary battery/display ecosystem and no variables to configure, the flexibility here might be more complex than desired.

Value for Money: Is It Worth the Price?

I evaluated the kit relative to other mid-drive options and full e-bike purchases. Considering the performance, flexibility in battery and display choices, and BAFANG’s solid reputation, I felt the kit offered strong value for upgrading a quality frame.

It’s often less expensive than buying a comparable full e-bike and lets you keep parts of your existing bike that you like, such as frame geometry, forks, and suspension.

Long-term ownership costs

Expect to spend on a reliable battery, occasional drivetrain replacement, and routine maintenance. However, these ongoing costs can still be lower than replacing an entire e-bike if you already have a reliable bike to convert.

Comparison to Other Options I Considered

I compared the M625 kit to hub motor kits and other mid-drives on power, smoothness, and adaptability. Hub motors are simpler to install but lack the gear-synced torque benefits a mid-drive provides for climbing.

I also looked at other mid-drives with similar power ratings and appreciated that the M625’s software focus on moderated acceleration felt particularly rider-friendly. The ability to choose displays and batteries is a differentiator that appeals to me.

Key differences I noticed

Mid-drive wins for hill climbing and efficient use of gears; hub motors win for install simplicity and lower drivetrain wear. The M625 sits comfortably in the mid-drive category with modern tuning to soften abrupt throttle behavior, which I valued during city riding.

My Recommended Settings and Tuning

I set the PAS to moderate levels for commuting and higher levels for steep climbs. I prefer a conservative throttle mapping for urban traffic to avoid sudden surges, and I adjust acceleration smoothing if the display allows it.

I recommend starting with conservative settings and gradually increasing assistance and top speeds as you get comfortable with the bike’s behavior.

Specific tuning tips

• Set a comfortable PAS level 1-3 for neighborhood riding and 3-5 for hills depending on your fitness.
• Use the display’s programming options to soften throttle ramp if available.
• Keep the motor RPM in a range where it feels responsive but not strained; shift down before standing climbs.
• Check chainline and adjust derailleur limit screws to reduce chain wear under load.

Final Thoughts and My Overall Rating

After weeks of riding, I feel the BAFANG 48V 750W 100MM Mid Drive Kit M625 is a mature, flexible conversion solution that blends power with a rider-friendly control philosophy. I appreciated the smooth starts, the torque for climbing, and the freedom to choose battery and display options that match my needs.

If I had to sum up my experience in one line: I turned my bike into a capable, faster, and still-configurable e-bike that kept handling and ride feel intact while giving me reliable power when I wanted it.

My personal rating summary

• Performance: Strong for hills and sustained assist.
• Usability: Good once installed and tuned, with a manageable learning curve.
• Value: Solid compared to buying a new e-bike, especially given battery/display flexibility.
• Overall: I would recommend it to riders comfortable with a mechanical install or willing to use a shop; it’s a powerful and adaptable mid-drive conversion that delivers on both performance and rideability.

If you’d like, I can walk through a detailed parts checklist for your specific bike frame, suggest battery capacity for your commute distance, or outline a step-by-step installation checklist I used.

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