Sun Prairie, Wis., Adopts E-Bike Rules That Define 'E-Motos' and Require Helmets for Riders Under 18

Sun Prairie, Wisconsin, has adopted an updated ordinance that classifies e-bikes and e-scooters in line with state definitions, creates a local definition for higher-powered "e-motos" and requires all riders under 18 to wear helmets, WKOW and WMTV reported on October 16, 2026. The Common Council approved the updated ordinance on Oct. 6, according to WKOW.

The ordinance revises the city's existing vehicles and traffic code to address the growing use of electric-powered devices on streets, bike paths and sidewalks, WKOW reported.

What the ordinance does

Classes that match state law. The ordinance sets classifications for e-bikes and e-scooters that align with state definitions, WKOW reported.

The 20 mph line. If a device can go more than 20 mph on its motor alone, it is not classified as a bike or scooter but as a moped, motorcycle or motor vehicle, the city says, and those vehicles must be registered, with a license and insurance, to be ridden on roads, WMTV reported.

Where e-motos can't go. E-motos are banned from sidewalks, shared-use paths and bike lanes, according to the city.

A registration gap. According to the city, many e-motos are too powerful to qualify as e-bikes, but manufacturers use a federal loophole to avoid motor-vehicle classification, making them impossible to register as street-legal in Wisconsin, WMTV reported.

Helmets under 18. Helmets are required for all bicycle and e-device riders under the age of 18, the city says.

Enforcement. The rules clarify where each type of device can legally operate and strengthen enforcement around speeding, traffic controls and pedestrian safety, WKOW reported.

Also in the update. The ordinance expands regulations to include pedestrians and play devices, and it sets up a framework for companies offering shared bike and scooter rentals in Sun Prairie, according to WKOW.

Why the city says it acted

"As more electric powered devices hit the streets, bike paths, and sidewalks of Sun Prairie, it's important that residents know how to safely and legally operate them," transportation coordinator David Salmon said, WKOW reported. "Some devices can operate at high speeds up to 50-70 mph – and those really cannot be treated the same as a bicycle."

Salmon said Sun Prairie is a Vision Zero community committed to eliminating serious injuries and fatalities. Between 2022 and 2025 in Wisconsin, e-bike crashes jumped 194% and e-scooter crashes rose 260%, according to the Dane County Traffic Safety Commission, as cited by WKOW.

What comes next

City staff are developing educational materials aimed at parents and young riders to help families understand whether their devices are legal, where they can be operated and how to follow traffic rules. Staff have also partnered with the Sun Prairie Area School District to include this education in the in-school bike curriculum, WKOW reported.

Where it stands

The Common Council has approved the ordinance, according to WKOW and WMTV. Neither report gave an effective date. This is news coverage of a local ordinance, not legal advice; riders should check the City of Sun Prairie for the full adopted text.

The e-bike pros' take

Know what you ride. Under Sun Prairie's rules, a device that can go more than 20 mph on motor power alone is not treated as a bike or scooter.

Under 18? Helmet on. Sun Prairie now requires helmets for all bicycle and e-device riders under 18.

Check where you ride. E-motos are barred from sidewalks, shared-use paths and bike lanes in Sun Prairie.

Need a helmet? See e-bike–rated helmet picks on ElectricBikes.com

More e-bike law news: Modesto Advances Bike and E-Bike Rules With Fines Up to $5,000 and Impoundment Up to 30 Days, Modesto Bee Reports · Albany County, N.Y., Passes E-Bike Helmet Law for All Riders, Spectrum Reports · California Clarifies E-Bike vs E-Moto Rules Under New Newsom-Signed Laws

Photo: The clock tower on Sun Prairie City Hall, by Joe Hanneman via Wikimedia Commons (CC BY-SA 3.0); cropped, headline added in the featured image. Illustrative Sun Prairie landmark; not a product endorsement.