Electric scooter motor sizes 60, 70, 75, 80, 90, 100: What do these sizes mean?
In the name of an electric scooter motor, there's almost always a number: 60, 65, 70, 75, 80, 90, 100. For us, this number refers to the size of the motor's magnets, measured in millimeters. Our XHS and XHT motor specifications clearly state this: it represents the width of the magnets. The larger the magnet, the more torque the motor produces and the more current it can handle without overheating. However, this number doesn't tell the whole story; it doesn't indicate the speed, which depends on the motor's winding. Here's how to understand these sizes correctly.
The essentials
- On our datasheets, the number in the name refers to the number of magnets in the motor, measured in millimeters.
- For the XHS and XHT models (75, 80, 90, 100), it's the width of the magnets that matters: the wider the magnets, the more torque the motor produces and the better it handles current without overheating.
- The size doesn't tell you anything about the speed; it's the winding (High Speed or High Torque) that determines it.
- With other manufacturers, the designations don't follow a common rule: always ask what measurement the number represents.
What this measurement indicates about our motors
In a hub motor, the magnets are glued inside the rotating bell, facing the stator windings. The wider the magnets, the larger the surface area on which the magnets and windings interact. For our X-series motors, the specifications are clear: the numbers 75, 80, 90, and 100 refer to the width of the magnets.
Our other specifications simply state "Magnets: 60 mm," "Magnets: 65 mm," or "Magnets: 70 mm." The number in the name refers to the magnet size, and the specification sheet doesn't provide any further details. If you are comparing two motors for a particular setup, please ask us for the exact measurement: this is the critical dimension for determining the arm opening.
To understand where these magnets are located, please refer to our guide on how hub motors work.
Why do wider magnets provide more torque?
The torque of a motor arises from the interaction between the magnetic field and the current in the windings. With wider magnets, this interaction occurs over a larger surface area: at the same current, the motor exerts more force. And for the same amount of effort, it requires less current, therefore generating less heat. This is precisely what our XHS and XHT specifications summarize: the wider the magnets, the more torque the motor produces, and the more current it can handle without overheating.
There's a trade-off: a wider motor is heavier and requires more space between the arms. Our specifications indicate approximately 8 kg for the XHS75 and around 9 kg for the XHS80, XHS90, and XHS100 models. Installing a wider motor than the original often requires custom axles and spacers.
How our sizing charts determine each size
For the X series, our documentation provides a simple rule:
- 75: the standard model, such as the XHS75 motor.
- 80: A step above, designed for heavier riders, such as the XHS80.
- **90 and 100:** These are reserved for very powerful configurations, using high-power controllers, such as the XHS90 and the XHS100.
The following table summarizes the information provided in our product sheets and catalog for the entire product range.
| Motor | Magnets | Nominal power | Phase cables | Format |
|---|---|---|---|---|
| W50 | 50 mm | 2000 W | 6 mm² | Integrated tubeless rims, for scooters with wheel sizes from 11" to 13" |
| SHS60 / SHT60 | 60 mm | 1200W | 4 mm² | Integrated tubeless rims, for scooters with wheel sizes from 11" to 13" |
| W60 | 60 mm | 2000 W | 6 mm² | Integrated tubeless rims, for scooters with wheel sizes from 11" to 13" |
| FH60 / FHS60 / FHT60 | 60 mm | 3500W | 4 mm² | Half-rims, 10" wheels |
| MHT65 | 65 mm | 4500 W | 10 mm² | 6.5-inch half-rims |
| MHS70 / MHT70 | 70 mm | 6000W | 10 mm² | 6.5-inch half-rims |
| MHS75 / MHT75 | 75 mm | 6000W | 10 mm² | 6.5-inch half-rims |
| XHS / XHT 75 and 80 | 75 or 80 mm | 6000W | 10 mm² | Weped rim or CNC-machined rim |
| XHS90 / XHS100 | 90 or 100 mm | 6000W | 10 mm² | Weped rim or CNC-machined rim |
It's important to note that the nominal power output doesn't necessarily correlate with the size of the motor; it also depends on the construction, winding, and cabling. The number of magnets is a reference point, but not a direct measure of power.
What the size doesn't tell you: the speed
Two motors of the same size can have very different speeds, and a smaller motor can spin faster than a larger one. It all depends on the winding. Our datasheets clearly show this, with the no-load speeds at 60V:
- FHT60: 1,380 RPM; FH60: 1,758 RPM; FHS60: 2,900 RPM. Same magnet size, three windings, three speeds.
- W50: 2,124 RPM, compared to 1,980 RPM for the W60. The motor with the smallest magnets spins the fastest.
- MHT65: 1,800 RPM; XHS75 and MHS75: 2,340 RPM.
The choice between speed and torque is made with the High Speed or High Torque version, explained in our guide High Speed or High Torque, and in the one about Kv and Kt.
And what about the "60H" and "75H" models from other brands?
On the market, you'll find motors sold under names like "60H" or "75H." There is no common standard that defines what these numbers and letters represent: each manufacturer or retailer has its own way of naming its motors. The number may refer to the magnets, the stator, or something else, and the letter may signify something other than "High Speed" or "High Torque."
Before comparing two motors from different brands, ask the seller what the specified number actually represents. Specifically, inquire about the no-load speed at a given voltage, the cross-sectional area of the phase cables, and the weight. These are comparable data points; a brand name is not.
Workshop tip
Do not choose a size larger "just in case." A 90 or a 100 will only be beneficial if the controllers and battery provide the current to utilize its full potential, and it adds unsprung weight. For most modified machines, a 75 remains the best starting point, while an 80 is suitable for heavier riders.
Frequently Asked Questions
Is a 80-size motor faster than a 75-size motor?
Not necessarily. The width of the magnets provides torque and current handling capability; the speed depends on the winding and the battery voltage.
Why does a wider motor tend to run cooler?
To produce the same amount of torque, it requires less current. However, heat in the windings increases very rapidly with current. Therefore, it generates less heat for the same amount of effort.
Will a larger motor fit in my scooter?
It depends on the arm opening. Our motors are compatible with most machines, provided they have custom-machined axles and spacers. Please send us a photo of the arm and the measured opening, and we will confirm compatibility.
Is that number the motor's diameter?
No, in our motors, this refers to the magnets, and for the X series, it indicates their width. The wheel diameter is specified separately: a 6.5-inch rim is used for 11-inch to 13-inch tires, or a 10-inch wheel is used for the FH series.