The Hidden Dangers of E-Bike Repairs: Why Many Bike Shops Won’t Touch Them

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AURORA, Colorado — MacKenzie Hardt, owner of Hardt Family Cyclery in Aurora, Colorado, has a warning for anyone bringing in an electric bike for repairs: unless it meets strict safety certifications, his shop won’t touch it. His caution comes from personal experience—while working on an e-bike, he accidentally triggered a cadence sensor, causing the wheel to spin violently and tear tendons in his hand—even though the motor and battery were disconnected.

“I know a guy who lost a finger working on e-bikes,” Hardt says. His shop now explicitly states in its voicemail that it will only service e-bikes with UL 2849 certification, the gold standard ensuring that an e-bike’s electrical system, battery, and motor have undergone rigorous safety testing.

Hardt’s stance reflects a growing dilemma in the cycling industry. As e-bike sales surge, repair shops face mounting risks—from safety hazards to legal liabilities—when servicing these high-powered machines. Many mechanics now refuse to work on uncertified or improperly classified e-bikes, leaving riders struggling to find reliable maintenance options.

The Wild West of E-Bike Standards

One of the biggest challenges in e-bike repairs is the lack of uniform regulations. While 46 U.S. states classify e-bikes into three categories (Class 1, 2, and 3) based on speed and power, many models sold online exceed legal limits, blurring the line between bicycles and motorized vehicles.

“That’s really the heart of the service problem,” says Cory Oseland, manager of The Ski Hut, a high-end bike shop in Duluth, Minnesota. “Once you slide out of the three classes, you run into parts and equipment that aren’t part of the traditional bike industry.”

Some e-bikes, particularly those imported from overseas, operate more like mopeds or motorcycles, with motors far exceeding the 28 mph limit for Class 3 e-bikes. These unregulated models often lack standardized components, making repairs difficult—and dangerous.

Liability Nightmares for Repair Shops

Beyond mechanical risks, bike shops face legal and financial exposure when servicing e-bikes. Because they are part of the product liability chain, a shop could be held responsible if a repaired e-bike malfunctions and causes injury.

E-bike-related accidents have skyrocketed in recent years. According to hospital data, injuries linked to e-bikes surged by over 1,020% between 2020 and 2024. With such risks, many shops refuse to service uncertified models.

“I have known people who have lost their shirt,” Hardt says. If an e-bike doesn’t fit within the Class 1-3 framework, a shop’s insurance may not cover damages, leaving owners vulnerable to lawsuits.

The lack of national e-bike regulations further complicates matters. “We don’t regulate what an e-bike is uniformly across the country,” Hardt explains. “What’s legal in one state might be illegal in another.”

The Rise of “Frankenstein” E-Bikes

Another issue plaguing repair shops is the rise of DIY e-bike conversions, where riders modify traditional bicycles with aftermarket electric kits. These makeshift e-bikes often lack proper wiring, battery safety mechanisms, or motor cutoffs, making them fire hazards and mechanical liabilities.

“Working on an unregulated bike is like if somebody brought in a Tesla to fix,” Hardt says. Without standardized parts, mechanics must often improvise repairs, increasing the risk of failure.

Some shops, like Bikes Together, a nonprofit community bike hub where Hardt previously served as executive director, have stopped servicing e-bikes altogether due to safety concerns.

What Riders Can Do

For e-bike owners, the solution lies in buying certified models from reputable brands and ensuring their bikes meet UL 2849 or EN 15194 safety standards. Riders should also:

• Verify their e-bike’s classification (Class 1, 2, or 3) before seeking repairs.
• Avoid uncertified online purchases, particularly from overseas sellers.
• Seek specialized e-bike mechanics rather than traditional bike shops for complex issues.

As the e-bike market continues to expand, experts urge policymakers to establish clearer national standards to protect riders and repair shops alike. Until then, the industry remains a regulatory gray zone—one where mechanics must weigh risks every time an e-bike rolls into their shop.

For now, the message from bike shops is clear: buyer—and rider—beware.