Threesixty
Gears are there to keep the desired cadence. Selecting the cadence is more important than selecting gears...great innovation, except there are only three selectable cadences with step-less gears? Step-less cadence should only be a step away!
MQ
Nice to see the Nuvinci being used in an end application, the application seems to suit the mechanism.
Would also be good if the rider was able to infinitely select whichever pedalling speed (cadence) they prefer for a given situation rather than only having 3 to choose from (the 3 ranges may be user customisable, but the article didn't go that far, if not, why not) because that is effectively limiting the system to discrete gear ratios again.
TheSplund
Perfect for the market it's aimed at, though I doubt I'd feel happy on a bike with such high bars and a seat that far back and would more likely choose the Breezer Beltway. Interestingly for a bike whose pitch is one that isn't about technology, and more about the ride, you can pair an Android device to it but what can't these days. Sadly I couldn't figure out the lowest gear (in inches) that it'll effectively go so I wonder how suitable it'd be for a place like Devon. However the NuVinci has a 360% range* so could one assume that a 26-94 inch range be plausible? I read elsewhere that it has a range of 30-120 rpm cadence. Fullbroook have an interesting pitch with 'a full 360 range' as it's implying that you couldn't go any higher than 360% - my Audax bike has a 434% range - still it's very good and exactly what the market needs.
Sean Simpson
Using the AutoBike Android or iOS app (via a bluetooth connection to the bike), you can adjust the desired cadence in 1 rpm increments anywhere from 30 to 100+ rpm. Using the buttons on the bike will adjust the target up or down in 5 rpm increments (anything smaller than 5 rpm is tough to even detect) over the same range.
While Ben demo'd the bike, we made adjustments using the app so we didn't get into the details of the bike-mounted buttons.
Just wanted to point that out since I probably neglected to mention it but it's an important point as the commenters noted. :)
Sean Simpson
The Evolution is currently spec'd for 34-122 gear inches (45T/20T) and the Voyage/Voyage ST for 28-99 gear inches (38T/20T). Either can be changed but we've found these to be the favorite settings after getting many test riders on each bike. Our next app release will also enable someone to change these values to match any sprocket changes they make post-purchase.
The reason we added the ability to pair the app with a smart phone is because we already do all the computing in the background and all that was needed was the bluetooth system on chip and a little C coding. While not required to use/enjoy the bike, the benefits are possibly avoiding the purchase of a cycle computer, being able to tune/tweak the bike post-purchase, sharing riding experiences with friends, diagnostic/troubleshooting help, and remote firmware/feature updates. We also use it extensively during development as well as in the final testing phase of the bike building process. Plus it's flat-out cool! :)
The Skud
Sounds very effective! I wonder how much spare capacity the dynamo has to run front/rear lights for night riding? Most countries have mandatory lighting requirements these days, if you go for a ride near dusk you need safety for the home journey anyway. I presume people would be able to amend the bars and (hopefully) seat position for personal comfort?
Grunchy
I had the AutoBike Classic, that was a 6 speed auto shifting derailleur system from many years back. It had weights on the rear wheel spokes that shifted radially with speed, causing the rear 6 speed derailleur to shift up and down automatically. I thought the system was pretty neat, I learned how to control it easily enough however not everybody who tried it had the same success. It was a completely useless gimmick, of course. A decent set of index shifters are so simple and intuitive to use that automatic shifting, frankly speaking, has no practical application.
Bob Stuart
That is not the shift pattern that anyone uses manually. It also has to respond to torque as well, raising the cadence for higher efforts, but not in direct proportion. The accelerometer helps, but the system needs to know when one is almost coasting, but turning the cranks for blood circulation. Fast pedal boats are remarkable good at matching torque to cadence with no gear changing, just hull resistance.
Mark Simpson
The "Brains" can make gear changes several times/second, independent of the rider's actions, while pedaling or not. The rider can coast, accelerate or decelerate, and the bike will maintain the proper gear ratio needed for the chosen cadence. I've yet to see an indexing shifter that can function at that rate, have as many gear choices or be that intuitive.
Todd Edelman
Seriously, no built-in lights? Considered hub brakes?
With all the settings, it just seems like another way to shift gears in terms of the user wondering what cadence is right all the time.