Final Drive (Chain, Belt or Shaft)

The final drive is the last link in the drivetrain, transferring power from the gearbox output to the rear wheel. There are three main types:

• Chain – light, efficient and easy to change gearing via sprockets; needs regular cleaning, lubrication and tension adjustment. Used on most sport, off-road and smaller bikes.
• Toothed belt – quiet, clean and long-lasting with little maintenance; common on Harley-Davidsons and some cruisers and scooters.
• Shaft – enclosed and almost maintenance-free apart from gear oil changes; heavier, typical of touring bikes and BMW boxers.

Final drive ratio – front to rear sprocket teeth on chain bikes – affects acceleration and top speed. Always replace chain and both sprockets together.