Doppler 14/42 up gears for the Yamaha Zuma
Adding an upgear kit will increase your top speed and lower your RPM.
The 14/42 is a taller gear set than the 15/50 and requires a powerful engine to pull them.
Adding an upgear kit will increase your top speed and lower your RPM.
The 14/42 is a taller gear set than the 15/50 and requires a powerful engine to pull them.
