Not every fat tire eBike buyer wants the same thing. Some riders want a machine that can leave pavement, cross gravel, handle dirt, and still work for daily transportation. Others want a comfortable electric cruiser with a wide seat, relaxed posture, and strong motor support for neighborhood rides and weekend recreation.
The Addmotor Motan M-650X and Soletan M-66X sit on opposite sides of that choice even though their specifications overlap heavily. Both have 750W Rear-Drive Motors, 48V 20Ah Samsung batteries, 20 x 4.0-inch fat tires, full suspension, seven pedal-assist levels, 20 mph top speeds, 300-pound payload ratings, and up to 105 miles of range in PAS 1.
Parameter Comparison Table
| Specification | Motan M-650X | Soletan M-66X |
|---|---|---|
| Primary Use | All-terrain / mixed-surface riding | Cruiser / moped-style recreational riding |
| Motor | 750W Rear-Drive Motor | 750W Rear-Drive Motor |
| Peak Output | 1,400W | 1,300W peak output |
| Torque | 80Nm | 80Nm |
| Battery | 48V 20Ah Samsung, 960Wh | 48V 20Ah Samsung, 960Wh |
| Range | Up to 105 miles (PAS 1) | Up to 105 miles (PAS 1) |
| Top Speed | 20 mph | 20 mph |
| Pedal Sensor | Dual torque sensor | Speed sensor |
| Pedal Assist | 7 levels | 7 levels |
| Suspension | 80mm oil-spring front + rear oil-spring shock | 80mm front suspension + rear shock system |
| Tires | 20 x 4.0 fat tires | 20 x 4.0 Kenda GIGAS fat tires |
| Brakes | Mechanical disc, 180mm rotors | Tektro mechanical disc, 180mm rotors |
| Payload | 300 lbs | 300 lbs |
| Current Listed Price | $1,999 | $1,899 |
The difference is lifestyle.
M-650X: Built Around Terrain Variety
The M-650X is presented as an all-terrain fat tire eBike. Addmotor gives it a 750W Rear-Drive Motor, 1,400W published peak power, 80Nm of torque, a 25A controller, and a dual torque sensor.
Those components are useful when the road surface changes. A torque sensor reads how hard the rider is pedaling and adjusts support accordingly. When the bike reaches a hill, the rider naturally pushes harder and the system can respond. When the route flattens, lighter pedal pressure can produce lighter assistance.
That interaction gives the M-650X a more bicycle-like character even though it is a heavy, powerful fat tire eBike.
Its 80mm oil-spring front suspension and rear oil-spring shock also support the same purpose. The bike is designed to manage rough pavement, gravel roads, packed dirt, sand, snow, and mild trails without forcing the rider to own separate bikes for every surface.
M-66X: Built Around the Cruiser Experience
The M-66X is immediately recognizable because of its long banana seat and moped-inspired silhouette. It is less interested in looking like a conventional bicycle and more interested in making electric cruising comfortable and visually distinctive.
The bike uses a 750W Rear-Drive Motor, a speed-sensor pedal-assist system, seven PAS levels, and a half-twist throttle. Addmotor has published the M-66X with up to 1,300W peak output and 80Nm of torque.
For everyday riding, that system is simple. The rider selects an assist level, starts pedaling, and the motor joins in. The long seat, rear footpegs, full suspension, and fat tires make the bike feel at home on neighborhood streets, bike paths, beach areas, campgrounds, and casual weekend routes.
The M-66X can still travel over imperfect surfaces, but its design communicates comfort before technical control.
Commuting on the M-650X
For commuting, the M-650X makes sense when the route is not perfectly predictable.
A rider may leave home on residential pavement, use a rough shoulder, cross a gravel shortcut, climb a hill, and finish on a city bike path. A torque sensor can make those transitions feel smooth because power delivery changes with rider effort.
The 20 mph top speed is practical for urban and suburban riding, while the 960Wh battery gives the rider a large energy reserve. Full suspension also helps if the commute includes potholes, patched asphalt, construction zones, or broken shoulders.
The main trade-off is that an all-terrain fat tire eBike is not as light or nimble as a simple commuter bike. Riders who need to carry the bike upstairs or load it into a small vehicle should think about storage and handling as much as motor power.
Commuting on the M-66X
The M-66X is also capable of daily commuting, but it has a different advantage: comfort.
The broad seat and upright cruiser layout reduce the feeling that the rider must maintain an athletic cycling posture. For a short or moderate trip to work, a coffee shop, a store, or a local destination, that can be appealing.
Its fat tires and suspension help reduce vibration from rough pavement, and the large 48V 20Ah battery means frequent short trips may not require daily charging.
The longer moped-style body is less focused on agile bicycle handling, so riders dealing with tight bike storage rooms or narrow racks should consider its dimensions before buying.
Weekend Riding
The M-650X is the more natural choice for riders whose weekend plans include exploration. Dirt roads, park trails, gravel paths, packed sand, or mixed-surface routes fit the bike's all-terrain identity.
The M-66X is the more natural choice for riders whose weekend plans are social and relaxed. Cruising by the beach, moving through a campground, riding around a neighborhood, or taking a scenic paved path better matches the bike's design.
This is why comparing only motor wattage can lead buyers in the wrong direction. Both bikes have enough electric power for normal recreational riding. The question is how the rider wants the chassis to behave around that power.
Passenger-Friendly Design
The M-66X has a clear lifestyle advantage for riders attracted to a passenger-style setup. Its long banana seat and rear footpegs are central to the design.
Riders should always follow local laws, manufacturer guidance, payload limits, and safe operating practices when carrying another person, but the M-66X is visually and functionally designed around a shared cruiser experience in a way the M-650X is not.
The M-650X is better understood as a solo rider's all-terrain eBike.
Range and Charging
Both models use the same 48V 20Ah battery capacity and are advertised for up to 105 miles in PAS 1. That means neither bike has a major range advantage on paper.
The M-650X may be ridden more aggressively on hills and trails, which can reduce range. The M-66X may see more throttle use, which can also reduce range. In either case, real mileage depends far more on usage than the shared maximum figure suggests.
Value
Current Addmotor pricing places the M-650X at $1,999 and the M-66X at $1,899.
For the extra $100, the M-650X offers a newer torque-sensor all-terrain platform and a 1,400W published peak output. The M-66X saves $100 while retaining the same battery capacity, range claim, top speed, and payload rating, and adds a distinctive long-seat cruiser design.
The better value therefore depends on which features the rider will actually use.
Final Thoughts
Choose the M-650X if your everyday riding includes uncertainty. If you want one eBike that can commute during the week and explore gravel or dirt on the weekend, its torque sensor and all-terrain suspension concept are meaningful.
Choose the M-66X if your everyday riding is more relaxed. If comfort, style, a broad seat, and a moped-like cruiser feel matter more than technical trail response, the M-66X fits that purpose more directly.
The two bikes are close in specifications but far apart in personality. The M-650X is about adapting to terrain. The M-66X is about making the ride itself feel easy.
