In the post-pandemic era and with increasing traffic congestion, people are seeking healthier, convenient, and eco-friendly means of transportation. Compared to traditional bicycles and electric scooters, electric pedal-assist bicycles are easier to use. UCO20 is designed to be unisex, user-friendly, and safer, offering a perfect balance between aesthetics and practicality. It combines travel and exercise, making it the ideal choice for daily commuting or going to school.1. Feasibility: UCO20 features excellent human-machine engineering, breaking the traditional division between men's and women's bicycle styles. It adopts a step-through frame, making it unisex. With its lightweight design and 20-inch small wheel diameter, it offers a lower seat height and a lower center of gravity, allowing even users as short as 1.5m to ride easily. 2. User-Friendliness: The handlebars of UCO20 have only three buttons: power on/off, increase, and decrease. The interface is simple and user-friendly. There is no separate electric assist switch, as it utilizes torque sensors to provide automatic assistance while riding, eliminating the need for additional operations. It is also speed-limited, with a maximum speed of 24km/h, ensuring a safer ride. The battery can be easily detached, providing flexibility in operations. 3. Functionality: The bike offers various accessories to enhance its practicality. Accessories such as front baskets, rear racks, and tail boxes meet different cargo-carrying needs. The bike is equipped with rearview mirrors for real-time observation of road conditions, as well as front headlights and rear reflectors for ensuring safety during nighttime rides. 4. Structural Design: UCO20 adopts an integrated design, embedding components such as the instrument panel, lights, reflectors, cables, chainrings, chains, battery, and motor into the bike, enhancing its waterproof and durability properties. Moreover, the platform design allows for the sharing of components and technologies, resulting in the development of five new models (Japan Mom Bike, cargo, fat bike, share bike, scooter). This improves both research and development efficiency and manufacturing efficiency, reduces development costs, and minimizes energy consumption.The whole bike has a sleek and streamlined design, perfectly combining functionality and aesthetics without unnecessary decorations, making it highly identifiable. Multiple accessories have been developed to enhance the practical functionality of the product, meeting the diverse needs of users. Various measures have been implemented to ensure the safety of cycling. The frame is made of aluminum alloy, while the wheels use magnesium alloy monolithic casting wheels, providing high strength and lightweight characteristics. The integrated design incorporates the instrument panel, lights, and reflectors into the handlebars, while the chainrings and chains are integrated into the bottom bracket and rear fork. The battery is housed in the seat tube, and the motor is embedded in the integrated wheel. These four key modules form the technological core of the bike, with internal cable routing ensuring a clean and tidy appearance. Designing such integration requires maximizing the use of limited space to integrate various components properly, ensuring their functionality without compromising comfort and stability during riding. This poses significant challenges in structural design and manufacturing processes.Electric bicycles represent the modern pursuit of environmental friendliness, health, and convenience. The design of UCO20 fully considers the needs of beginners and petite users. With its unisex design, it not only enhances the riding experience for users but also improves research and development efficiency, reduces development costs, and minimizes energy consumption. By addressing safety and practicality concerns, UCO20 effectively enhances people’s enjoyment of commuting, effectively mitigating both traffic and environmental pollution.Safety: The hidden chain design eliminates the worry of skirts getting caught. Equipped with a rearview mirror, riders can focus on cycling without having to glance back, maximizing safety. Speed is limited to 24km/h. The intelligent SmartHON system provides automatic assistance when climbing and stops assistance when the vehicle tilts at 30°. Health: Equipped with a torque sensor, it provides assistance based on the rider’s pedaling frequency. It makes uphill climbs and long-distance rides easier without straining the knees, while also providing physical exercise. User-friendly: With a minimal number of buttons and a clear interface, it is easy to operate, allowing users to quickly get the hang of it without the need for an instruction manual.