Pedal with caution: What to know before modifying your e-bike

Arizona law recognizes three classes of e-bikes. Class 1 bikes provide pedal assistance up to 20 mph. Class 2 bikes can reach 20 mph and have a throttle, while Class 3 bikes provide pedal assistance up to 28 mph and face additional limits, including restrictions on some paths.

Modifying an e-bike to go faster can create legal and safety questions. Ajo Bikes manager Hoz Olvera said the shop repairs modified bikes but does not alter their software or make the modifications. He advises against changes that push a bike beyond 28 mph because the frame and tires may not be designed for that stress.

Pima County Sheriff's Department Traffic Unit supervisor Sgt. Anthony Pool said e-bikes generally can travel anywhere traditional bicycles are allowed unless signs prohibit them. Arizona law does not clearly spell out what happens when a modified e-bike exceeds its class speed limit. Pool said unsafe operation rules may still apply, and the bike could fall into a gray area between a bicycle and a motorcycle.

Riders should continue following traffic rules, whether their e-bike has been modified or not. Pool also encouraged people to report dangerous behavior involving e-bikes, bicycles, motorcycles or other vehicles to local law enforcement. Ajo Bikes, at 1301 E Ajo Way, can help riders choose an e-bike suited to their needs.