Super73 B1G
Class 2
Legal class
20 mph
Top speed
520 Wh
Battery
20 mi
Claimed range
90 lb
Weight
250 lb
Max load
The big-frame A-Series: a 33 inch seat and a recommended rider height up to 6 feet 8 inches, which is the tallest rider any bike here is specified for. At 90 lb it is also the heaviest Super73, on the same 520Wh pack and the same quoted 20 miles as the M1D. Buy it for the fit, not the range. Brakes are Super73, 2 piston, hydraulic; suspension is rigid; seat height 33 inches; charge time 5-6 hours; horn fitted. SENSOR SOURCE: Super73 publish the sensor type on no product page. Their own guide at https://eu.super73.com/blogs/guides/cadence-and-torque-sensor says "The SUPER73 Z-MIAMI, ZG, and ZX are equipped with a cadence sensor. The rest of the SUPER73 models have a torque sensors." Super73 describe the pack as "UL2271 Compliant", which is a battery claim and a weaker word than certified; there is no UL 2849 system claim.
Full specification
| Headline | |
| Price | $2,595 |
|---|---|
| Category | Fat tire & moto |
| Price per Wh | $4.99 per Wh |
| Model year | 2026 |
| Motor | |
| Motor power | 500 W |
| Drive | Rear hub |
| Motor make | Super73 |
| Sensor | Torque |
| Battery & range | |
| Battery | 520 Wh |
| Voltage | 52V |
| Capacity | 10 Ah |
| Removable battery | Yes |
| Range (claim) | 20 mi |
| Range as stated | 20 miles at 20 mph on throttle only |
| Est. real range | 21 mi |
| Estimate assumes | 25 Wh per mile |
| Weight & capacity | |
| Weight | 90 lb |
| Max load | 250 lb |
| Class & speed | |
| Ships as | Class 2: throttle, assist to 20 mph |
| Unlocks to | Class 2 |
| Class | Class 2 |
| Throttle | Yes |
| Top assisted speed | 20 mph |
| Build | |
| Gears | Single speed |
| Drivetrain | Single speed |
| Brakes | Hydraulic disc |
| Suspension | Rigid |
| Fork travel | Rigid |
| Rear travel | None |
| Front suspension | No |
| Tires | 20 x 4.5 front, 20 x 5.0 rear |
| Frame | Aluminium |
| Step-through option | No |
| Included | |
| Lights | Yes |
| Safety | UL 2271 |
| Safety certification | UL 2271: battery only |
| As the maker states it | Batteries described as UL 2271 compliant (compliant, not certified) |
Safety certification: UL 2271: battery only. Super73 states: “Batteries described as UL 2271 compliant (compliant, not certified)” (source). That is the manufacturer’s own claim, not something we verified, you can check a specific model in UL’s Product iQ database. Why this matters.
Specs transcribed from super73.com on 09/22/2026. Fields the manufacturer does not publish are shown as “—” rather than estimated. Manufacturers revise specs without notice: confirm before buying.
Compared with
Head to head against the fat tire & moto bikes closest to it on price.