Originally Posted by
WhyFi
Uh, you do realize that the product in the vid was integrated with a powertap hub?
Yeah, but no way to sense 1) my intent, nor 2) my desired power delivery. Sometimes at given output I want 67 rpm, others 90 depending upon what I feel like at the moment...
Just torqued up a big hill? I wanna spin... Just spun out, then a nice low cadence whump, whump, whumo...
Originally Posted by
Caliper
Already exists. Search for Nuvinci 360. Pretty interesting, I keep looking forjust the right bike to put it on.
Now, if they made a fixed gear CVT, that would be interesting...
The nuvinci loses at least 15% AT IT'S MOST EFFICIENT RATIO!... Some ratios were GREATER THAN 20%!
Like dragging your brakes!
A derailleur system looses what 7%? Based upon fixed gear loosing like 6%, and the boggies for the derailleur pulleys can't add that much drag... Saw studies on replacing the bushing based pulleys w/ high end bearing ones having an effect that could not be felt.
So at best DOUBLE the drive train loss?
And it is REALLY heavy, feels like a decent pack on the rear...
Chain would have to be in truly horrible shape to match that..
For the supposed gains, and engine loves continuously variable step-less ratios.. There is 1 optimum place for output at given output, maybe some ranges might have 2 with v-tech or a few with variable valves, but that's it...
But leg muscles are profoundly flexible in their output.
For most outputs (especially in the sustainable ranges) you can deliver a given power output in a wide range of rpm...
Originally Posted by
Homebrew01
How will that help ?
I could be riding at 20 mph putting out 200 watts in a 53 x 16
Tomorrow, exact same road, speed & watts, but I feel like spinning a bit more in the 53 x 17
Every ride is different based on mood, goals, fatigue level, and can chage during the ride.
exactly, though I'm pathetically lame so it's mostly fatigue... I get a lot more mileage in a day than I should by switching to different cadence patterns when I trash one... Most times spin at ~80, sometimes ~65-70, others 70's... and occasionally 90's...
Wipe one out on a hill, no problems change up cadence pattern.