Sähköpolkupyörä

Sähköpolkupyörä, commonly referred to as an e-bike or electric bicycle, is a pedal-assisted, battery-powered bicycle designed for urban commuting, recreation, or transportation. The concept of an e-bike was introduced in the 1990s, and since then, their popularity has grown significantly due to environmental concerns, health benefits, and technological advancements.

An e-bike typically consists of an electric motor, a battery, a controller, and a set of pedals. The motor provides assistance to the rider, either as a pedal-assist or a throttle-based system. Pedal-assist motors engage only when the rider is pedaling, while throttle-based motors can provide power even when the rider is not pedaling. The battery powers the motor and is usually rechargeable. The controller manages the power delivery based on the rider's input and the battery's state of charge.

E-bikes come in various classes based on the level of motor assistance and the type of motor used. Class 1 e-bikes have a motor that provides assistance only when the rider is pedaling, up to a maximum speed of 20 km/h or 25 mph. Class 2 e-bikes have a throttle-based motor that can provide assistance even when the rider is not pedaling, up to a maximum speed of 25 km/h or 32 mph. Class 3 e-bikes have a pedal-assist motor that can provide assistance up to a maximum speed of 45 km/h or 50 mph.

E-bikes offer several benefits, including reduced traffic congestion, lower greenhouse gas emissions, and improved physical fitness. They are also an accessible mode of transportation for people with disabilities or those who find traditional cycling challenging. However, e-bikes also have drawbacks, such as the need for regular battery maintenance and the potential for over-reliance on motor assistance, leading to a decline in cycling skills.

The use of e-bikes is regulated in many countries, with specific laws and regulations governing their use on public roads, maximum speed limits, and motor power. It is essential for riders to familiarize themselves with these regulations to ensure safe and legal use of e-bikes.