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NuVinci CVT - MegaZone's Safety Valve
The Ramblings of a Damaged Mind
zonereyrie
zonereyrie
NuVinci CVT
This is pretty nifty, in a mech-geek sort of way.

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Comments
tyoshida From: tyoshida Date: March 28th, 2007 12:26 am (UTC) (Direct Link)
I knew what CVT stood for, but the video makes it so clear as to how it works. Very informative and cool.
From: yamazakikun Date: March 28th, 2007 01:04 am (UTC) (Direct Link)
Nice, although reading between the lines on their website, I'd expect one of these transmissions in a bicycle hub to be priced similarly to a Rohloff 14-speed, which runs $1300 or thereabouts.

I need to replace the Sram 3-speed hub in my Brompton with something that has a wider gearing range; right now, if I was going to get one or the other, it would be the Rohloff, as it goes down to 0.3 underdrive versus the 0.5 of the NuVinci, and that's more important with 16" wheels than 1.75 overdrive (NuVinci) vs. 1.5 (Rohloff).

Ideally, it'd be a combination of the NuVinci and a Schlumpf Mountain Drive, but that's hitting close to $2000 of transmission upgrades on a $1300 bicycle, which seems just a tad excessive. Will probably just get a more reasonably-priced 7-speed hub and save the difference for a full-size bike for when I want to go longer distances (horizontally or vertically).
From: yamazakikun Date: March 28th, 2007 01:07 am (UTC) (Direct Link)
And I just reread that FAQ... this puppy weighs 4.2 kg. So it's off the table for my Brompton even if I was willing to drop the cash.

mackys From: mackys Date: March 28th, 2007 01:17 am (UTC) (Direct Link)

Bah.

Friction-based junk.

I need to find the $1k to patent my CVT idea so I can show people the prototype...
From: (Anonymous) Date: March 28th, 2007 06:55 am (UTC) (Direct Link)
I prefer the Yonge CVT. Too bad he's decided to focus on his variable-pitch prop head before going back to the bicycle transmision, which is chain-driven rather than friction-based.
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