Super73 Top Speed: How Fast Each Model Goes & How to Increase It
Super73 Top Speed: How Fast Each Model Goes & How to Increase It
Most Super73 models top out between 20 mph and 28 mph out of the box, depending on the bike’s class configuration. The top unrestricted speed across the lineup falls at 28 mph (Class 2 or 3 settings, model-dependent), while some models ship with a 20 mph cap when set to Class 2. You can adjust speed limits through the display settings or add aftermarket components, but any modification beyond legal class limits may affect warranty, range, and road legality. This guide covers each model’s stock top speed, real-world riding expectations, and the safest ways to increase speed without jeopardizing the bike’s reliability.
Quick answer
| Model | Stock top speed (factory setting) | Max achievable speed* |
|---|---|---|
| Super73 S2 | 28 mph (Class 2 mode: 20 mph) | 28 mph |
| Super73 R Series (R / RX) | 28 mph (Class 2 default: 20 mph) | 28 mph |
| Super73 Z Series (Z1 / ZX) | Z1: 20 mph; ZX: 28 mph (Class 2 default: 20 mph) | 28 mph (ZX) |
| Super73 C1X (concept, limited) | ~50 mph (motorcycle-class) | 50+ mph |
| Super73 S1 (older model) | 24 mph (stock) | 28 mph (with unlock) |
*Max achievable speed refers to what the motor and controller can sustain with factory components after changing class mode or derestricting; does not account for aftermarket upgrades like higher-voltage batteries or alternative controllers.
What this means for your buying decision: If you need a legal street bike for commuting on bike lanes and paved paths, the 20 mph Class 2 default is your safest choice. If you own private land or have access to unrestricted trails, the same bike in Off-Road mode delivers 28 mph — but the same physical machine requires a menu setting change to unlock it. Do not assume a model ships at 28 mph; most US deliveries default to Class 2. Verify the current class setting on your display before planning your ride speed, and check your local e-bike regulations before switching modes.
Comparison framework
Top speed on a Super73 depends on three core factors: the motor’s continuous power rating, the battery’s voltage and current delivery, and the bike’s class law setting. All current production models use a hub motor rated at 2,000W peak (750W nominal) for the S2, R, RX, and ZX, while the Z1 uses a 500W nominal motor. The C1X is a separate category — a street-legal moped with a 13,500W peak motor.
The rider’s weight, tire pressure, terrain grade, and wind also cut real-world top speed by 2–5 mph compared to the displayed maximum. For example, a 200‑lb rider on a mild uphill will see about 22–24 mph on an RX set to Class 3, even though the display reads 28 mph on flat ground.
Class settings and speed limits
- Class 2: throttle‑only operation, top speed 20 mph (default for most models shipped in the US).
- Class 3: pedal‑assist only (no throttle beyond 20 mph), top speed 28 mph.
- Unrestricted “off‑road” mode: available in the display settings on S2, R, RX, and ZX; enables 28 mph with throttle and pedal assist combined. This is not road‑legal in many states and voids the manufacturer’s compliance certification.
How to verify your current class setting on the bike itself: With the battery switched on and the bike stationary, press and hold the up‑arrow button on the top‑tube display for about 3 seconds. The display will show the active mode (C2, C3, or OF). If the screen reads C2, your top speed is capped at 20 mph regardless of throttle or pedal input. To change the setting, power the bike off, then press and hold the up‑arrow while turning the battery on. Use the up/down buttons to cycle through options, then confirm by holding the up‑arrow again. This verification takes less than a minute and prevents confusion between display speed and actual legal class.
Battery and range trade‑off
Running the bike at 28 mph continuously cuts range by roughly 30–40% compared to 20 mph. On a 960 Wh battery (S2, R, RX), you’ll get about 30–40 miles of range at 20 mph, but only 20–25 miles at sustained 28 mph. The ZX’s smaller 615 Wh battery drops to about 15–20 miles at max speed.
Best‑fit picks by use case
Daily commuter (legal, reliable, decent range) – Super73 S2 or R Series set to Class 2 (20 mph). These bikes offer a comfortable upright position, integrated lights, and enough torque for mild hills. The 28 mph cap in Off‑Road mode is available for flat, private paths, but commuting at 20 mph maximizes range and avoids legal risk.
Weekend cruiser / light trail rider – Super73 RX (with suspension). The RX’s front and rear suspension smoothes out rough pavement and dirt paths. At 28 mph in Off‑Road mode, the added damping makes higher speeds feel stable. Expect reduced range (~25 miles) if you ride at full throttle off‑road.
Budget‑minded or younger rider – Super73 ZX. It uses the same 2,000W peak motor as the S2 but with a smaller battery and simpler frame. Top speed is 28 mph after unlocking Off‑Road mode. The trade‑off is less range (15–20 miles) and no suspension, so bumps are harsher at speed.
Performance enthusiast (concept / limited) – Super73 C1X. This is not a standard e‑bike; it’s a 50+ mph electric motorcycle with turn signals, mirrors, and a motorcycle VIN. Only consider this if you have a motorcycle license and plan to register it. Most riders will not need this level of speed.
Trade‑offs to know
Speed “hacks” and warranty impact
Online forums discuss “Super73 speed hack” methods like reprogramming the controller with third‑party firmware or adding a voltage booster. These modifications:
- Void the factory warranty on the motor, controller, and battery.
- Risk overheating the motor (the stock controller has over‑current protection, but aftermarket setups bypass it).
- Make the bike illegal on public roads in all US states that follow the federal e‑bike classification (20/28 mph caps).
If you want more speed, the safer path is to confirm your bike is set to Off‑Road mode (if you own a compatible model) and ensure the battery is fully charged — voltage drop at low state of charge reduces peak motor output by 1–3 mph.
Real‑world speed verification
The bike’s display speed is typically 1–2 mph optimistic compared to a GPS reading. Use a phone‑based GPS speedometer app to check your actual speed. If you consistently see 27 mph on the display but 25 mph on GPS, expect that gap.
Class compliance and enforcement
Most US states (and many local municipalities) enforce e‑bike class limits on public roads, bike lanes, and multi‑use paths. Riding a Super73 set to Off‑Road at 28 mph on a Class 2‑only bike path can result in a citation or confiscation. The bike’s label (affixed to the frame) states its certified class. Removing or altering that label raises legal risk.
Aftermarket upgrades that make sense
- Larger front sprocket (for chain‑drive models like the RX): improves top speed by ~2–3 mph but reduces hill‑climbing torque.
- Higher‑amp controller: increases current to the motor, raising speed by 3–5 mph. This demands careful thermal monitoring and usually voids the warranty.
- Higher‑voltage battery: not plug‑and‑play on current Super73s; requires custom wiring and BMS reconfiguration. Not recommended unless you’re an experienced e‑bike builder.
Most riders are better off staying within the stock Off‑Road mode’s 28 mph limit — the gains beyond that require significant cost, complexity, and risk.
A realistic mismatch to watch for: Even if your model supports Off‑Road mode, the bike’s frame label shows a certified class that may not match the setting you choose. For example, an S2 that ships with a Class 2 label can still be switched to 28 mph via the display, but riding it at that speed on public roads means you are operating outside the bike’s certified classification.
If you are stopped by law enforcement, the frame label — not the display setting — is what the officer will check. Some owners have received citations even when the bike was capable of 28 mph, simply because the label said 20 mph. If you plan to ride at 28 mph on public roads, consider models that ship with a Class 3 label from the factory (check the frame sticker before purchase).
Related questions
How fast is a Super73 without pedaling?
On throttle only, a Super73 set to Off‑Road mode delivers full power up to 28 mph. In Class 2 mode, throttle cuts out at 20 mph. In Class 3 mode, throttle stops at 20 mph, but pedal assist continues to 28 mph.
Can I increase my Super73 speed without voiding the warranty?
The only method that keeps the warranty intact is switching the bike to Off‑Road mode (if your model supports it) via the display settings. Any hardware modification or third‑party firmware change voids the warranty.
Does the Super73 Z1 go faster than 20 mph?
The Z1 (first‑generation) is limited by its 500W nominal motor and smaller controller. Some riders unlock a “sport mode” through the display, bringing top speed to about 24–25 mph, but the motor runs near its power ceiling and may overheat on sustained hills.
What is the Super73 max speed with the C1X?
The C1X concept bike was advertised with a top speed of over 50 mph and a 13,500W peak motor. It is classified as a motorcycle, not a standard e‑bike, and requires a motorcycle license, registration, and insurance. Production remains limited.
If you’re still uncertain which model fits your speed needs, check your local e‑bike laws and consider where you’ll ride most. A Super73 that hits 28 mph in Off‑Road mode offers plenty of thrills on private land, while the 20 mph default keeps you legal on public roads without sacrificing the bike’s core fun factor.
Explore This Topic
- Back to Super73
- Back to Super73 E-Bikes
Related guides in this cluster:
– Super73 Modding Guide: Best Upgrades, Speed Hacks & Customization Ideas
– Super73 RX Review: Real-World Performance, Range & Honest Owner Impressions
– Super73 Weight Limit & Sizing: Find the Right Model For Your Build
– Super73 Battery Guide: Charging, Range, Replacement & Care Tips
Ryan Williams has spent over 8 years testing, repairing, and writing about electric bikes. He has personally ridden and reviewed 150+ e-bike models from brands like Lectric, Aventon, Rad Power, Super73, and dozens more.
Before founding EBIKE Delight, Ryan worked as a bicycle mechanic for 5 years at independent bike shops across California, where he specialized in e-bike conversions and electrical system diagnostics. He holds a Certificate in Electric Vehicle Technology from the Light Electric Vehicle Association (LEVA).
Ryan’s work has been cited by Electric Bike Report, Electrek, and BikeRumor. When he is not testing the latest e-bike on California backroads, he is in his workshop tearing down batteries and controllers to understand what makes them tick — and what makes them fail.
Areas of Expertise
E-bike performance testing and real-world range verificationBattery diagnostics, charging best practices, and safetyBrand comparisons: Lectric, Aventon, Rad Power, Super73, and moreError code troubleshooting across major e-bike systemsE-bike laws, registration, and compliance by state
Ryan believes every rider deserves honest, hands-on information — not marketing hype.