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E-Bike and E-Scooter Speed by Voltage (36V to 72V)

Quick Answer: Voltage alone doesn’t set top speed — the motor’s speed constant (KV, in rpm per volt), wheel size and load matter just as much. As a rough guide, typical 36 V scooters and e-bikes reach 25–30 km/h (15–19 mph), 48 V about 35–45 km/h (22–28 mph), 60 V about 50–65 km/h (31–40 mph) and 72 V about 60–80+ km/h (37–50+ mph). Use the calculator below for your own setup, or measure real speed with the GPS speedometer.
E-bike and scooter speed by voltage

E-Bike and Scooter Top-Speed Calculator

Enter the battery voltage, the motor’s KV (rpm per volt — often 8–15 for hub motors; check the spec sheet) and the wheel diameter.

How it works: motor rpm ≈ voltage × KV; speed = rpm × wheel circumference. Under a rider’s weight, real top speed is usually about 75–85% of the no-load figure, so the calculator uses 80%. Speed limiters in the controller override all of this.

E-bike and scooter speed by voltage — Typical top speed in km/h — motor, wheel size and load also matter
Typical top speed in km/h — motor, wheel size and load also matter

Typical Top Speed by Battery Voltage

VoltageTypical top speedUsually found on
24 V15–20 km/h · 9–12 mphKids’ scooters
36 V25–30 km/h · 15–19 mphCommuter scooters, EU pedelecs
48 V35–45 km/h · 22–28 mphFaster scooters, US Class 2–3 e-bikes
52 V40–50 km/h · 25–31 mphPerformance e-bike conversions
60 V50–65 km/h · 31–40 mphDual-motor scooters
72 V60–80+ km/h · 37–50+ mphHigh-performance scooters, light e-motorbikes

These are typical ranges across common models, not guarantees. Big motors (several kW and above) put a vehicle in electric-motorcycle territory, with speeds of 80–120+ km/h — far beyond what is legal as a bicycle or scooter.

Legal Speed Limits for E-Bikes and Scooters

Direct Answer: In the EU and UK, a pedal-assist e-bike’s motor must stop assisting at 25 km/h (15.5 mph) with at most 250 W. In the US, Class 1 and 2 e-bikes assist up to 20 mph (32 km/h) and Class 3 up to 28 mph (45 km/h), with motors up to 750 W. E-scooter limits vary widely by country and city, often 20–25 km/h.

Faster vehicles are usually classed as mopeds or motorcycles and need registration, insurance and sometimes a license. Check your local rules before modifying a controller.

Measure Your Real Top Speed

Manufacturer speeds are measured with light riders on flat ground. To know your actual speed, mount your phone and open the bike speedometer; its Max figure records your top speed. Also see average cycling speed.

Frequently Asked Questions

How fast is a 48V e-bike?

Typically 35–45 km/h (22–28 mph) without a limiter. Legal e-bikes are limited to 25 km/h in the EU and 20–28 mph in the US.

How fast is a 36V scooter?

Usually 25–30 km/h (15–19 mph), often limited to 20–25 km/h for legal use.

How fast is a 72V scooter in mph?

Commonly 37–50 mph (60–80 km/h), and some high-power models go faster.

Does higher voltage always mean more speed?

For the same motor, yes — speed rises roughly in proportion to voltage. Across different motors, KV and wheel size can matter more than voltage.