Fat tire & moto
Ariel Rider Kepler
$1,699
Price
118 Nm
Torque
1040 Wh
Battery
98.6 lb
Weight
Ariel Rider Kepler vs Super73 Z Miami
Two fat tire & moto e-bikes at $1,699–$2,195, every published spec lined up. Nothing here is estimated: a figure the manufacturer does not publish is shown as “—”.
Where they differ
- The Kepler carries 560 Wh more battery.
- The Kepler claims 40 more miles of range.
- The Z Miami is 39.6 lb lighter.
- The Kepler assists 8 mph faster.
- The Kepler costs $496 less.
- The Kepler carries 75 lb more total load.
- The Kepler uses a torque + cadence sensor; the Z Miami uses a cadence sensor.
- The Kepler is hardtail (front only); the Z Miami is rigid.
- The Kepler ships as class 2–3; the Z Miami ships as class 2.
Every spec, side by side
| Kepler | Z Miami | |
|---|---|---|
| Headline | ||
| Price | $1,699 | $2,195 |
| Category | Fat tire & moto | Fat tire & moto |
| Price per Wh | $1.63 per Wh | $4.57 per Wh |
| Model year | 2026 | 2026 |
| Motor | ||
| Torque | 118 Nm | — |
| Motor power | 750 W | 500 W |
| Peak power | 1940 W | — |
| Drive | Rear hub | Rear hub |
| Motor make | Ariel Rider | Super73 |
| Sensor | Torque + cadence | Cadence |
| Battery & range | ||
| Battery | 1040 Wh | 480 Wh |
| Voltage | 52V | 48V |
| Capacity | 20 Ah | 10 Ah |
| Cells | Samsung 21700 | — |
| Removable battery | Yes | Yes |
| Range (claim) | 75 mi | 35 mi |
| Range as stated | Up to 75 miles | 25 to 35 miles at 20 mph on throttle only |
| Est. real range | 42 mi | 30 mi |
| Estimate assumes | 25 Wh per mile | 16 Wh per mile |
| Weight & capacity | ||
| Weight | 98.6 lb | 59 lb |
| Max load | 400 lb | 325 lb |
| Class & speed | ||
| Ships as | Class 2: throttle, assist to 20 mph | Class 2: throttle, assist to 20 mph |
| Unlocks to | Class 3 | Class 2 |
| Class | Class 2–3 | Class 2 |
| Throttle | Yes | Yes |
| Top assisted speed | 28 mph | 20 mph |
| Build | ||
| Gears | 8-speed | Single speed |
| Drivetrain | Shimano Altus (13-32T) | Single speed |
| Brakes | Hydraulic disc | Mechanical disc |
| Front rotor | 203 mm | — |
| Rear rotor | 203 mm | — |
| Suspension | Hardtail (front only) | Rigid |
| Fork travel | — | Rigid |
| Rear travel | None | None |
| Front suspension | Yes | No |
| Tires | 24 x 4.0 | 20 x 4.0 front and rear |
| Display | Large full-colour, Bluetooth, USB-C | — |
| Frame | — | Aluminium |
| Sizes | One size | — |
| Step-through option | No | No |
| Included | ||
| Lights | Yes | Yes |
| Safety | — | UL 2271 |
| Safety certification | — | UL 2271: battery only |
| As the maker states it | "UL Safety Certified" stated without naming the standard | Batteries described as UL 2271 compliant (compliant, not certified) |
Specs transcribed from arielrider.com on 09/20/2026 and super73.com on 09/22/2026. Manufacturers revise specs without notice: confirm before buying.