A cadence sensor. The motor engages as soon as the cranks turn, regardless of how hard you're pedaling, instead of scaling power to your effort the way a torque sensor would.
Super73 S2 E-Bike Review: Upway Best-Seller
Written by: Tom Fortune | July 20, 2026 | Time to read 5 min
The Super73 S2 doesn't try to hide that it's throttle-first. Pedals are there if you want them, but this bike is designed for a moped feel, not a bicycle one.
More about the Author: Tom Fortune
Tom is a Brit living in the French Alps. When he's not creating written and video content for various brands, he's either pedalling or snowboarding around his local mountains. E-Bikes have unlocked the potential for Tom to explore Alpine terrain and get away from the crowded bike parks. He is only too keen to share his knowledge and experience with other riders.
Super73 helped create the whole moped-style e-Bike category, and the S2 is one of its most recognizable models and an Upway best-seller. The frame looks more like a small motorcycle chassis than a bicycle, with a long bench seat and fat, motorcycle-style tires front and back. There are pedals, but the throttle handles most of the riding.
👋 Welcome to Upway!
Upway is your top destination for buying and selling e-Bikes online. Discover your next e-Bike at up to 60% off retail prices, available in new or like-new condition.
What Is the Super73 S2?
| Spec | Super73 S2 |
|---|---|
| Motor | 750W nominal rear hub, up to 2,000W peak in Off-Road Mode |
| Battery | 960Wh (48V), UL 2271 compliant, removable |
| Claimed range | 40 to 75 miles depending on mode |
| Top speed | 20 mph (Class 1-2), 28 mph (Class 3), 28+ mph (Off-Road Mode) |
| Weight | 71 to 74 lb |
| Rider weight limit | 325 lb |
| Frame | Aircraft-grade aluminum alloy, fixed one-size frame |
| Suspension | Front only, air-spring dual-crown fork (travel figures vary by source, 60 to 140mm) |
| Drivetrain | Single-speed |
| Sensor | Cadence sensor |
| Brakes | Hydraulic disc, front and rear |
| Tires | BDGR, 20x4.5" front / 20x5" rear |
| Seat height | 31 inches, fixed position |
How It Rides
It delivers power through a cadence sensor instead of a torque sensor, so the motor kicks in as soon as you turn the pedals. The S2 also has a throttle, allowing you to ride without needing to pedal at all. It's not overly punchy, which some riders find underwhelming if they want instant power, but it makes low-speed control easier and is useful for anyone new to throttle e-Bikes. The S2 has an off-road mode that bumps peak output to around 2,000W and allows you to ride faster than Class 3's 28 mph. That mode is meant for private land, not public streets.
Handling has a genuine quirk worth knowing about. The dual-crown suspension fork limits how far the handlebars can turn, which gives the S2 a noticeably wider turning radius than a standard bicycle. The short wheelbase helps offset that somewhat, giving the bike a livelier feel at low speed despite the wide turns. Front suspension alone means bumps and dips transmit through the rear end more than they would on a fully suspended bike, though the wide, high-volume tires absorb plenty of the small stuff on their own.
Braking comes from hydraulic discs front and rear, giving you dependable stopping power that matches the bike's weight and speed capability well.
Motor and Battery
The 750W rear hub motor is a geared, brushless design that does the job on flat ground and moderate hills without much fuss. Since it's a hub motor instead of a mid-drive system, you'll notice it isn't as efficient on steep, sustained climbs. If you notice your e-Bike's battery range decreasing over time, it's worth knowing when to replace the battery before assuming the motor is the problem.
The 960Wh battery is removable and UL 2271-certified for safety. Super73 claims a range of 40 to 75 miles. The low end reflects throttle-only Class 2 riding, and the high end assumes gentle Class 1 pedal assist. In practice, most riders land closer to 30 to 50 miles. Heavier riders should expect the lower end of that range no matter which mode they're using.
Class switching between Class 1, Class 2, Class 3, and Off-Road Mode is done through the Super73 app, which also supports Bluetooth connectivity for firmware and ride data.
Things to Know Before You Buy
Weight makes this bike hard to live with in some situations. At 71 to 74 lbs, the S2 is difficult to lift onto a car rack, carry up stairs, or maneuver through a narrow doorway. Anyone living above the ground floor or relying on public transit should factor that in before buying.
The one-size frame doesn't suit every rider. Taller riders tend to find their knees bending more than they'd like when pedaling, since the seat height and crank position don't adjust the way a standard bicycle's would.
Super73 has faced class-action lawsuits over range claims and Class 2 compliance, specifically around throttle output on some models exceeding 20 mph without pedaling. Some cases have settled. If you're buying used, it's worth checking your specific serial number against any settlement-affected ranges on Super73's support page.
Actual range regularly falls short of the marketing figures, a pattern common across the e-Bike industry but worth factoring into your expectations regardless.
Who Should Buy the Super73 S2?
- Riders who want a throttle-first, moped-style ride for city streets and want it fully street-legal in Class 2 form right out of the box.
- Anyone drawn to the retro cafe racer look who values the S2's distinct style as much as its performance.
- Riders who plan to keep the bike on flat to moderately hilly routes, where the hub motor and single-speed drivetrain aren't asked to do too much.
Riders who live in a walk-up apartment, need to lift the bike regularly, or want a bike closer to 40-55 lbs, should look elsewhere in Super73's lineup or at other brands entirely.
Alternatives Worth Considering
The Super73 S1 trades the S2's bigger battery and peak power for a lighter, simpler, and cheaper build, worth a look if the full S2 spec sheet is more than you need.
The Super73 R Brooklyn adds full front and rear suspension, along with a higher price, a better fit for riders who want more comfort on rough pavement and don't mind paying for it.
Find a Super73 S2 on Upway
The S2's popularity means there's a healthy supply of used units on the market, which works in your favor if you're shopping pre-owned. Every listing goes through 50 inspection points before Upway clears it for sale, and any battery reading below 80% capacity gets swapped out ahead of time.
Coverage includes a one-year warranty on the frame, motor, and electrical system, plus 14 days to decide if it's the right fit once it arrives.
Browse the current electric bike selection on Upway, or check out the sale collection to compare current pricing.
Frequently Asked Questions
Does the Super73 S2 use a torque sensor or a cadence sensor?
Is the Super73 S2 street legal?
Yes, in its default Class 2 configuration, throttle and pedal assist are limited to 20 mph. Class 3 and Off-Road Mode unlock higher speeds that may not be street-legal everywhere.
How much does the Super73 S2 weigh?
Between 71 and 74 lbs, depending on the source, heavy enough that lifting or hauling it regularly takes genuine effort.
Key Takeaways
- The Super73 S2 is a Class 2 moped-style e-Bike with a 750W hub motor, a 960Wh battery, and front-only suspension, positioned between the lighter S1 and the fully suspended R-series.
- Weight, a fixed one-size frame, and actual range below marketing claims are the main trade-offs to know about before buying.
- Upway's certified pre-owned listings include a 50-point inspection, battery replacement below 80% capacity, a one-year warranty, and a 14-day return window.
