Some say that when it comes to internal hubs this one is the best. One reviewer described it as “gears without headaches”. At the $320 to $400 range it is reasonable. You can certainly pay a lot more for an internal hub. It is available in 32 or 36 hole (spokes) and silver or black. It can be shifted effortlessly while sitting still or under load. I believe this unit weighs 5.4 pounds. For comparison a typical front and rear derailleur system weighs approximately 3 pounds.
Wikipedia says “The NuVinci CVT further offers the ability to accept multiple inputs while varying speed and ratio, managing torque and providing single or multiple power outlets. By supporting a torque-demand rather than a speed-demand control solution, the NuVinci CVT solves the low-speed acceleration problem inherent in some torque-demand vehicles.”
* CVP (Continuously Variable Planetary) drivetrain technology with an infinite number of ratios
* Simple twist controller enables easy, continuous ratio adjustments while pedaling
* No missed gears, hesitation or noise
* Includes CruiseController shifter
* 6-Bolt disc ready
* 1.8:1 Minimum Sprocket Ratio (e.g. 20/36)
* Cog not included, uses 17-22t HG-style 9-spline cogs, 3/32″ only
* Hub’s shift drive fits behind dropout for clean installation
* Shifter’s cable has quick clip on and off system to allow for simple flat repair
* 360% Ratio Range (0.5 Underdrive to 1.8 Overdrive)
* Approved for use with 250w motors with a minimum 2.1:1 sprocket ratio (e.g. 22/42)
How it works:
An animation of how the NuVinci® continously variable planetary (CVP) works including an explanation of the role of traction fluid in the transfer of power:
This has a full overdrive setting:
Quick Release Axle Hardware is available to replace standard axle nuts:
Here are some articles on the NuVinci N360 Internal Hub:
http://en.wikipedia.org/wiki/NuVinci_Continuously_Variable_Transmission
http://www.bentrideronline.com/?p=9928#more-9928
http://www.fallbrooktech.com/cycling/n360
Personally I like the idea of having an internal hub. I doubt very much if I will ever have one at this stage of my life. Being able to shift while sitting still or when you find you didn’t downshift when you should have is a real plus with these hubs. They could easily help us to …
ENJOY THE RIDE!
Tadpole Rider 