The ideal length for a motorcycle's swingarm depends on various factors, including the type of motorcycle, its intended use, and the desired handling characteristics. The swingarm length affects the motorcycle's wheelbase, which, in turn, influences factors like stability, maneuverability, and traction. However, there is no single "ideal" swingarm length that applies universally to all motorcycles.
Different motorcycle designs and purposes require different swingarm lengths. For example:
Sport Bikes: Sport bikes typically have shorter swingarms to enhance agility and quick handling. A shorter swingarm can contribute to quicker turn-in and better cornering performance.
Cruisers and Touring Bikes: These types of motorcycles generally have longer swingarms to provide a more stable and comfortable ride. A longer swingarm can contribute to improved straight-line stability, especially when carrying additional weight like luggage or a passenger.
Off-Road and Dual-Sport Bikes: Off-road motorcycles often have longer swingarms to enhance stability and traction in uneven terrain. A longer swingarm can help improve rear-wheel traction and control during off-road riding.
Custom Bikes: Custom motorcycles may have swingarms of varying lengths depending on the builder's design goals and aesthetic preferences.
Manufacturers carefully engineer the swingarm length to suit the intended purpose and characteristics of each specific motorcycle model. Altering the swingarm length on a stock motorcycle may affect its handling and stability, so modifications in this area should be approached with caution and ideally done by professionals.
It's worth noting that while swingarm length plays a role, it is just one factor among many that contribute to a motorcycle's overall handling and performance. Suspension setup, frame geometry, tire choice, and other factors also play significant roles in determining a motorcycle's ride characteristics.