The geometry of the electric vehicle frame is designed with full consideration of ergonomics, which involves multiple aspects to ensure that the rider can have a comfortable, safe and efficient riding experience.
The first is the relative position of the seat tube and the handlebar. The geometric design of the frame allows the seat tube height and angle to be adjusted according to the height and leg length of different riders. The appropriate seat tube height ensures that the rider's legs can stretch naturally when pedaling, without excessive bending to cause excessive pressure on the knees, nor excessive stretching to make it difficult to exert force. Generally speaking, when the foot reaches the lowest point of the pedal, the knee should remain slightly bent. At the same time, the height and distance of the handlebar are matched with the seat tube, so that the rider's arms can stretch naturally, and the body will not lean forward or backward too much when holding the handlebar, avoiding long-term riding and causing back and arm fatigue.
The second is the length of the frame. The length and span of the top tube of the frame will be designed according to the proportions of the human body. The span should be suitable for the rider to get on and off the vehicle conveniently, avoiding inconvenience or even danger caused by too high or too low span during getting on and off the vehicle. The length of the top tube affects the rider's body posture during riding. If the top tube is too long, the rider may need to overstretch to hold the handlebars, affecting handling; if it is too short, the body will appear cramped, which is not conducive to riding comfort and efficiency.
In addition, the head tube angle is also an important ergonomic consideration. The right head tube angle can affect the vehicle's handling performance and the rider's comfort. A gentle head tube angle will make the vehicle's steering relatively slow, but the ride will be more stable; a steeper head tube angle will make the vehicle's steering sensitive and suitable for riding under complex road conditions. While considering ergonomics, the head tube angle will be determined in combination with the use scenario of the electric vehicle to ensure that the rider can easily and naturally control the direction of the vehicle when operating the handlebars.
In addition, in order to improve comfort, the frame geometry may also consider the interaction between the suspension system (if any) and the human body. For example, when designing an electric vehicle frame with a suspension fork, the suspension travel and force will be considered to match the rider's weight and riding habits, so that the rider can reduce the impact of vibration on the body when passing through bumpy roads and maintain a good riding experience.
