Doppler 14/42 Pre Pressed up gears for the Yamaha Zuma
Adding an upgear kit will increase your top speed and lower your RPM.
The nice thing with the Doppler gears is they come pre pressed with a 13 tooth gear, making your install a little smoother.
The 14/42 is a taller gear set than the 15/50 and requires a powerful engine to pull them.
