Harley-Davidson switched from shaft drive to chain drive on some of their motorcycles for a variety of reasons. Here are a few factors that influenced this transition:
Cost: Chain drive systems are generally less expensive to manufacture and maintain compared to shaft drive systems. Harley-Davidson likely considered the cost-effectiveness of chain drives as a way to make their motorcycles more affordable for customers.
Performance and Power Transfer: Chain drive systems can provide a more direct power transfer from the engine to the rear wheel, which can enhance performance and responsiveness. The flexibility and adjustability of chains allow for more precise gear ratio selection, catering to different riding styles and conditions.
Weight and Efficiency: Chain drive systems are typically lighter than shaft drive systems, which can contribute to improved acceleration and maneuverability. By reducing the weight of the drivetrain, Harley-Davidson may have aimed to enhance the overall performance and handling characteristics of their motorcycles.
Customization and Personalization: Chain drive systems offer greater flexibility for customization. They allow riders to easily change the sprocket sizes, which can affect the gearing and performance of the motorcycle. This versatility aligns with Harley-Davidson's culture of individuality and customization, allowing riders to tailor their bikes to their preferences.
It's important to note that while Harley-Davidson has shifted to chain drive for some models, they still offer shaft drive options for certain motorcycles. The choice between chain drive and shaft drive ultimately depends on various factors, including the intended purpose of the motorcycle, customer preferences, and the desired balance of performance, maintenance, and cost considerations.