![]() ![]() Initial installation requires careful attention to the instructions, as the shifting mechanism must be properly installed on the axle, but once the set up process is complete, removing and reinstalling the wheel is only slightly more complex than it would be for a standard bolt on wheel, and easier than a coaster brake wheel (our wheel was set up for disc brake use - there is also the option of using the Shimano roller brake, which would make removal and reinstallation more difficult). The 150mm flange means that wheels must built in a two cross pattern, and the resulting wheel will shift the center of gravity rearward on the bike. ![]() The hub itself is larger and heavier than any other internally geared hub, but not unreasonably so. ![]() I had the privilege of riding it for the first week, and these are my impressions. As one of the first US distributors of this revolutionary hub, Seattle Bike Supply recently received a sample, which we promptly built into a wheel, installed on a bike, and began testing under the toughest conditions we could impose. The NuVinci Continuously Variable Transmission hub has finally achieved this goal: a bicycle drive train of moderate weight, good efficiency and durability under torque, with an infinitely adjustable gear ratio and a range of 350%. Until now, all the imaginative approaches to this mechanical conundrum have been either completely unworkable, or inappropriate for use on bicycles. There have been many attempts to build such a system, which would allow the rider to change the gear ratio throughout the range without being limited to specific gear increments. One goal that has obsessed inventors almost from the beginning has been the creation of a continuously variable drive system. The overwhelming variety of drive train styles has been the subject of many articles and several books, and new developments continue to appear. Since before the turn of the twentieth century, the development of gearing systems for bicycles has inspired a vast amount of technical invention and innovation. This Mondo Nuvinci review was written by Val Kleitz, originally posted to, and is blogged here with permission. ![]()
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