One of the main reasons why size matters when it comes to electric bikes is comfort. Unlike traditional bikes, ebikes come with a motor and battery, which can add extra weight and bulk to the frame. This can affect the balance, stability, and maneuverability of the bike, especially if it's too small or too large for your body size and shape.
A bike that's too small may feel cramped, unstable, and put too much pressure on your back, neck, and wrists. On the other hand, a bike that's too large may feel unwieldy, difficult to handle, and cause you to stretch too far to reach the pedals and handlebars. In both cases, you may experience discomfort, fatigue, and even pain, which can detract from the joy and benefits of riding an electric bike.
To avoid these issues, it's important to find an electric bike that fits your body well and offers good ergonomics. This means taking into account your height, weight, inseam, and arm length, as well as your riding style and preferences. Most ebike manufacturers provide size charts and recommendations based on these factors, so be sure to consult them before making a purchase.