There is an entire drawer full of different weight flywheels, again for adjusting the bike's performance to the rider's preference. Lighter flywheels can make the engine more responsive to inputs, but allow revs to drop quickly between shifts and make clutch control more difficult. A heavier flywheel makes it easier for the engine to maintain its speed at the expense of responsiveness. All options are available here to give the rider the best performance for each situation.