Could someone give me a short lesson on what the Nuvinci Hub does for a bike. I'm trying to wrap my head around the idea.
A NuVinci hub allows the bike rider to have an infinitely variable transmission inside the rear hub. Other kinds of internally geared hubs have some sort of twist or click shifting with a certain number of fixed gear ratios. With the NuVinci you turn or twist a shift unit on the handlebars but there's no fixed gears, no clicks; just a constant variation of gearing that you can dial in as you ride or at a stand still to create a comfortable pedaling experience. This way you can have the gearing feel exactly the way you want it to. They use a set of spherical planetary gears inside the hub with a pair of alignment rings that adjust the planetary spheres and that translates into a gear ratio but it's stepless and very smooth.
There are several models of the NuVinci system with the most recent including an automatic shifting system, the Harmony H/Sync, all run from your bike's computer console. Now if you want a little more control then there's the Harmony, but that's still automatic. For a manual, stepless system there's the Nfinity N330/380/380S. In many cases you have access to a wider gear ratio range than a typical set of cogs. These can be retrofitted to most bikes and there's a belt drive option, too.
NuVinci has a couple of good videos explaining the technology that can provide a visual understanding.
You're in for an interesting experience. I have one observation and a minor complaint about the N360. When you ride a NuVinci installed hub you have to re calibrate your thinking about setting a "gear" for each riding circumstance....because there aren't any reproducible gear ratios, only approximations. I got fairly good at setting the gearing with time, but it's imprecise. Most noticeable when you want a certain gearing for grades which you know will work. Not a deal breaker, but something you have to get accustom to. The one complaint I have is drag. The NuVinci hub does tend to have a noticeable drag that is more noticeable in higher gear ratios. I still enjoy riding the NuVinci outfitted bike, but for commuting I prefer a bike with defined gear ratios.I'm trying to wrap my head around the idea.
Yes, that is a plus. Handling power is a possible issue. Mine is on a 500W 36V mid-drive and so far it has worked flawlessly, but I would probably not put it in a 750W 48V system.For me, the best feature about the Nuvinci N360 is that you can shift it up or down while standing still
Thanks for the explanation. Between your explanation and the videos I now have a much better understanding of a Nuvinci Hub. I may opt for a Riese and Muller Tinker ebike in order to enjoy that technology.
Sorry you've got me on that one. I bet Chris Nolte or someone more knowledgeable can chime in and answer that. In the near future I definitely intend to get into the manuals and online materials a bit more.over50 ,
tks ... I have the Alfine 11 so more than likely I would have a similar experience.
do they recommend oil service intervals or is it sealed for life ?
Over50,I have very limited experience with the Nuvinci N380 (since my R&M is brand new (100 miles ridden)) but so far I am very pleased. It is so smooth and in my opinion brings a whole new (positive) dimension to biking. My area is relatively flat and being able to dial-in the gearing because it is a CVT is really nice. When cruising on flat terrain where there are just gradual grade shifts sometimes a slight gear change is a lot more efficient than shifting a complete gear as I do with the Alfine 8 on my human powered bike. Also shifting at a stop is a plus as pointed out (this applies I think to all IGHs).
On the flipside (don't want to say negative): a couple of times on a flat straight-away in Tour mode I hit the end of the gear range. I'm not sure if that is the technically correct way to say that but I mean I wanted to make it more difficult to pedal to increase my speed but I couldn't - I didn't have any range left. I imagine that could happen at the other end too but I don't have any big hills around here to test it on. At that point, since I couldn't pedal much harder I had to go from Tour mode to Sport thus increasing the cadence. No big deal but I felt like I could have maximized my battery usage if I had more gear range and could have done more with human power.
I've also experience this on my regular bike with my Alfine 8. My Spot is a pretty fast urban style bike. I was once gaining on a road biker on a straight-away but I ran out of gear range and couldn't quite catch him. There have been a couple of times with that bike that I regretted not getting the Alfine 11.
Harmony & Harmony H/Sync
This can be purchased aftermarket by qualified dealers. We have worked with H-Sync on a bike we were helping to develop. It's a little finnicky to get setup, but when it works it's great. I think this concept is great and I hope development continues to take place here.Can this system be purchased as an add on to existing installations? My research led me to believe this product was only available to OEM's. I can't say how old the 3 units I bought are there's no manufacturing date on the box or the unit. The one I haven't installed in a wheel is serial N250984.