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/n/ - Transportation - CVT for bicycles

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CVT for bicycles Anonymous 03/18/14(Tue)05:09 UTC+1 No.637871 Report

nasty cold weather is at an end. so I want to get back on the bike. my bikes shifters and gears are pretty shot to hell though and are at least a decade old. So I was thinking of putting a CVT like the n360 on my bike.

anyone got experience with cvts?

my biking is just roads in hilly Atlanta. just to exercise and run errands on.
Anonymous 03/18/14(Tue)12:54 UTC+1 No.637997 Report

Anonymous 03/18/14(Tue)18:01 UTC+1 No.638043 Report

What I'd be interested to know is how it handles extreme conditions like an all-out sprint; wouldn't be much good if it slipped or was damaged because you were applying 1500 watts of power to it.
Anonymous 03/18/14(Tue)18:35 UTC+1 No.638048 Report

i think rather it would be the most robust transmission to handle high torque
the mecanism is really simple, no gear teeth to break

ebikes.ca has a bike with a stokemonkey going through the n360
Anonymous 03/18/14(Tue)19:04 UTC+1 No.638049 Report

I wonder how much drag it introduces. Probably a lot, otherwise they'd be touting their numbers left and right, like Rohloff does.
Anonymous 03/18/14(Tue)20:47 UTC+1 No.638065 Report

No, it slips like most CVTs. Teeth can transmit much more force, but when overloaded they strip instead of slip. There is a reason why gears have teeth.

Please consider this.

Why do you need lots of gear ratios? To increase range and get closer gears for better efficiency.

The Nu360 only has 360% of range, and efficiency gained by being able to dial in your gear ratio is offset by the lack of efficiency in a CVT.

All it means is you have to spend more time shifting and hunting for the right gear ratio to achieve similar efficiency to a derailleur system.

Nu360 is really for specific niche purposes, most likely ones where you would use an IGH instead of a derailleur anyways, but you want different ratios and closer speeds than a standard IGH.
Anonymous 03/18/14(Tue)21:14 UTC+1 No.638078 Report

i said robust, i never said it was more efficient at transmitting high torque
the fact that it would slip rather than break a tooth is what makes it robust

i wouldn't trust putting a mid-drive motor through other IGH, not even a rohloff, but i would through the nuvinci
Anonymous 03/18/14(Tue)21:16 UTC+1 No.638079 Report

The problem is CVTs don't handle high torque. In that sense they are not robust.
Anonymous 03/18/14(Tue)21:21 UTC+1 No.638082 Report

It is important there to differentiate between "robust" and "high performance" and perhaps "high reliability". It might be two of the above, but not all three.
Anonymous 03/18/14(Tue)23:08 UTC+1 No.638101 Report

wat u say?

right from wikipedia about the Jap's type 10 tank:

"Engine: 4-stroke V8 Diesel engine 1200 hp/2300 rpm
Power/weight ratio: 27 hp/tonne
Transmission: Continuously variable transmission (Hydraulic Mechanical Transmission)
Operational Range: 440 km
Speed:Forward: 70 km/h
Backward: 70 km/h"

besides all that, cvt's have been used in high-torque applications for years and years. I'm speaking from an automotive repair perspective, but i see no reason why smaller (read: a pedal bike) cvt's would be any different than any other cvt in the world - 75% efficient (plus or minus a few percent) as a power transfer device and always in the perfect gear ratio.
If you want an auto trans for yer bike, DO IT FAGGIT
Anonymous 03/19/14(Wed)04:03 UTC+1 No.638179 Report

>besides all that, cvt's have been used in high-torque applications for years and years.
No they haven't. Obviously those CVTs are scaled up and rather huge for the amount of torque they can handle, and CVTs are not used for trucks or high performance sports vehicles with possibly a few exceptions, which is considered high torque for an automotive scale.
Anonymous 03/19/14(Wed)11:09 UTC+1 No.638298 Report

>75% efficient
Unacceptable for bicycle use. Chain driven derailer transmissions are typically ~95% efficient. A few percent here and there won't matter to most, but 20 percentage points is definitely significant.
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