One pedal revolution produces 2.33 revolutions on the rear wheel. Assume for this example it is a 42 front ring with a 18 tooth rear cog (42 x 18). This produces a gear ratio that would be equal to a one-speed bike with no internal gearing.
The gearing starts with the front chain ring and rear sprocket selected. The NuVinci™ N360® hub has a relatively wide range of gearing options.
NuVinci™ N360® hub internal (photo credit Fallbrook Technologies) A shifting idler and a special transmission fluid transfer the torque of the input (the chain-driven sprocket) through these balls to the output of the transmission (the wheel).įigure 1. The NuVinci™ transmission uses a set of rotating and continuously variable-tilt balls positioned between the input and output components of the transmission to vary the input-output ratios of the transmission (figure 1). If the system requires internal work it should be returned to the manufacturer. The hub where the gear changes take place is not considered user serviceable, or even accessible. Directions for use are simple: Ride bike, twist shift, be happy. It is difficult to describe without actually riding it, but especially the novice rider will immediately understand how it is to be used. Consider this system to be the slide trombone of the shifting orchestra, or if you prefer, the whammy-bar. The gear ratios seem to “slide” as you turn the shifter grip. The CVP system of the NuVinci™ N360® does not produce these distinct changes. Planetary gear systems produce distinct gear ratios as the rider shifts up and down the gear system. Traditional internal gear systems rely on a planetary gear system of tooth rings and gears. Internal transmission systems have been on the market from other manufacturers in systems offering from 2 speeds to 10 speeds for almost a century. This hub uses a Continuously Variable Planetary (CVP) transmission to drive the wheel. Fallbrook Technologies offers an interesting rear hub system under the name NuVinci™ N360®.
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