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3-speed front bicycle gearbox Efneo

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3-speed front bicycle gearbox Efneo

Old 02-03-15, 12:48 AM
  #1  
lopek77
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3-speed front bicycle gearbox Efneo

Very interesting concept
https://www.indiegogo.com/projects/3...-gearbox-efneo
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Old 02-03-15, 01:38 AM
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shafties have a clean look but this is deffo better, lighter and i like the idea you can kick down when not in motion
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Old 02-03-15, 01:46 AM
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worth a second look. i'd want to see how much extra drag is on the crank due to planetary gear and how much extra weight is involved, but i know not everyone would be concerned about that. i can see some advantages over tradition 3-speed IGH. price doesn't seem to be too bad. i'd probably lose the RD too. 3 speed more than enough for me. clean look.
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Old 02-03-15, 05:02 AM
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There's been a 2-speed version around for years in the shape of the Schlumpf drive:Produkte - haberstock mobility GmbH

For a commuter, shifting while stationary does have some appeal.
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Old 02-03-15, 07:37 AM
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Originally Posted by dabac View Post
There's been a 2-speed version around for years in the shape of the Schlumpf drive:Produkte - haberstock mobility GmbH

For a commuter, shifting while stationary does have some appeal.
The Efno is much easier to retrofit than the Schlumpf. The Schlumpf is a complete crankset that requires special tools to install, the Efno mounts on the drive side of any garden variety JIS square taper.
I think it's definitely worth a look.
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Old 02-03-15, 07:54 AM
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About 8% I would guess.

https://hubstripping.wordpress.com/g...vs-derailleur/
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Old 02-03-15, 10:10 AM
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This crank was reported on Bike Rumors recently. One comment pointed out one thing to consider if you are thinking of supporting this fund raising campaign. This is a "flexible funding" fund raiser so, if they don't meet their goal, they get to keep what they have raised and, if it isn't enough to produce the number of cranks they have contracted for, the last buyers are out of luck. "Fixed funding" campaigns like Kickstarter either make their total funding goal or the sponsor gets nothing and the contributors are not out the money they pledged.

I certainly hope they meet their goal and can commercialize this crank but be aware of the possible financial problems if you contribute.
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Old 02-03-15, 10:46 AM
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There's also the Patterson design based Metropolis 2sp crankset which has been around for a while, too...
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Old 02-03-15, 11:03 AM
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Originally Posted by HillRider View Post
This crank was reported on Bike Rumors recently. One comment pointed out one thing to consider if you are thinking of supporting this fund raising campaign. This is a "flexible funding" fund raiser so, if they don't meet their goal, they get to keep what they have raised and, if it isn't enough to produce the number of cranks they have contracted for, the last buyers are out of luck. "Fixed funding" campaigns like Kickstarter either make their total funding goal or the sponsor gets nothing and the contributors are not out the money they pledged.

I certainly hope they meet their goal and can commercialize this crank but be aware of the possible financial problems if you contribute.
I believe they will get what they want and more. I just wish they provided more technical details.
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Old 02-03-15, 11:29 AM
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The Efneo is much easier to retrofit than the Schlumpf. The Schlumpf is a complete crankset that requires special tools to install,
the Efneo mounts on the drive side of any garden variety JIS square taper.
Fixed the spelling 'Efno' reads like a quite negative opinion.. (Polish brand naming may need revision)

said to be 28 40 50 ish? all overdrive [1+ 43% , & + 79%] internal torque goes to the BB spindle?
[read Metro is a 28t + 1,6x '45't]

Not all Schlumpf installations require Chamfering the BB edge.. the Speed and High speed over drive do. its the friction grip that does the torque transfer

the greater torque of the Reduction gear Mountain drive , needs a solid torque arm. regular bikes its a coaster brake like strap around the chainstay.


Brompton version, the torque arm has a Knob, it sits on top of the part behind the BB where the rear pivot Is for the wheel Fold.

It was pretty plug and play.. Have the hook-spline wrench & a few pieces required ,
like : shuttle pin for the shift button has to be protected from a crank arm puller..

my Brompton BB shell edge was not flat faced , nor perfectly chamfered .. but it, some where in between, seems to be OK..


M3L .. front and rear planetary combo works well for the 4th to3rd double crank+ hub shift, ... to grab that lower range bogged down on a Hill..

Last edited by fietsbob; 02-03-15 at 11:57 AM.
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Old 02-03-15, 12:14 PM
  #11  
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Another piece of info on the Efneo... They told me that the current shifter is a rapidfire type for 22.2mm bars, but that they plan to offer a gripshift type that may be available for 23.8mm bars. They are looking for input from potential customers. The weight is stated to be an additional 500 grams over what a "typical" triple crank with alloy chainrings and front derailleur would be. Considering it's in the center of the bike, that sounds reasonably light.
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Old 02-03-15, 01:17 PM
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Originally Posted by Cross Creek View Post
The weight is stated to be an additional 500 grams over what a "typical" triple crank with alloy chainrings and front derailleur would be. Considering it's in the center of the bike, that sounds reasonably light.
I expect the touring riders, commuters and rail-trail users won't be bothered by the additional weight. The roadies will want nothing to do with it.
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Old 02-03-15, 01:34 PM
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i've got a couple of SS's with square tapered cranks i use for touring that could benefit from something like this. it would be nice to just slip off the drive side crank and bolt on the "tripleizer" when touring. mine have 22.2 bars on them so shifter would be no problem. wonder if it demands a full length housing.
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Old 02-03-15, 01:45 PM
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It would make more sense to do a two piece shifter: the shifter pod, and then various mounting diameter clamps -- 22.2, 23.8, 25.4, 26, 31.8...
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Old 02-03-15, 02:30 PM
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As mentioned early on in this post if they could show me some testing that does a direct comparison of energy transferred compared to the exact same gearing done thru a triple chain ring setup and the numbers were respectably close I would jump in and take a big bite of the pie. Conventional drives are amazingly efficient somewhere between 93% and 99% I wouldn’t mind a gearing loss of say 10% on just the granny gear if it could be made to be an effortless shift and then done with gears. I wouldn’t want to lose even 2% or 3% in my main riding gear range because of friction internal to a drive like this.

I don’t see where any serious rider touring or other would be willing to give away any power for easier shifting. The market for these will be for people that don’t care and want simple.

They should show the total picture when asking for funding I think.
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Old 02-03-15, 02:40 PM
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Originally Posted by mconlonx View Post
It would make more sense to do a two piece shifter: the shifter pod, and then various mounting diameter clamps -- 22.2, 23.8, 25.4, 26, 31.8...
More universal - more popular...Great and simple idea.
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Old 02-03-15, 02:41 PM
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Originally Posted by bud16415 View Post
As mentioned early on in this post if they could show me some testing that does a direct comparison of energy transferred compared to the exact same gearing done thru a triple chain ring setup and the numbers were respectably close I would jump in and take a big bite of the pie. Conventional drives are amazingly efficient somewhere between 93% and 99% I wouldn’t mind a gearing loss of say 10% on just the granny gear if it could be made to be an effortless shift and then done with gears. I wouldn’t want to lose even 2% or 3% in my main riding gear range because of friction internal to a drive like this.

I don’t see where any serious rider touring or other would be willing to give away any power for easier shifting. The market for these will be for people that don’t care and want simple.

They should show the total picture when asking for funding I think.
Lets stick to the topic please...no need to mix in Apple products and users...
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Old 02-03-15, 02:58 PM
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the 3 speed in the hub & a cassette driver combo Hub is already out there, but that wont help fund this guys idea into production..

Powodzenia!

Last edited by fietsbob; 02-03-15 at 03:04 PM.
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Old 02-03-15, 03:47 PM
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Granted, this product isn't for "serious" cyclists, but it wasn't intended to be. For every one of us that would like to see data comparing efficiency losses vs a triple crank, there are probably hundreds of potential users who really don't care, so long as it doesn't feel like they're dragging a box of rocks behind them. It's intended for commuter bikes, city bikes, and casual riders, not serious touring or competition. Thinking of my bikes with IGHs, and times I've loaded down a rear rack, I tend to feel weight a lot more over/in the rear wheel than under or in front of me, so a light, SS wheel with one of these up front might be a very pleasant combination. As was mentioned earlier, the 28 tooth equivalent ratio is too low for most if not all IGHs, and the Efneo site says that. They recommend this crankset for derailleur and SS (freewheel, not fixie) bikes, as a replacement for front derailleur rigs and to add useable gears to SS bikes without resorting to an IGH wheel.
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Old 02-03-15, 04:34 PM
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I do agree. There are a million things that consume energy on a bike. My biggest power robbing factor by far is too much weight on the seat post. People ride bikes with fat balloon tires and springs have extra losses. This is a great idea really and for 99% of the people riding bikes its not robbing them of anything in terms of riding because if the device adds say 4% to the effort required and they drop down one gear and say gain 6%ease of riding the bike. The result is they don’t notice and what they really lost was a bit of time in their journey. So the ride from home to work or school takes 31 minutes instead of 30 minutes or something like that. Going for an ice cream cone who would notice? Now if I was riding across the state and had knowledge of this and was putting in 10 hours on the bike thinking aboute every ounce of weight that was rolling along with me and what I could leave behind and those kind of thoughts. Maybe I haven’t switched gears in the last hour, I might start thinking 5% would mean this or that.

Last edited by bud16415; 02-03-15 at 04:39 PM.
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Old 02-12-22, 02:38 AM
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Just put an EFNO on my Vision recumbent because of chain routing issues. Could not be happier. So nice to be able to shift crank speeds when at a stop. My only gripes:

1. 152 is only short crank length. A little too short- most recumbent riders like 160.

2. Wish there was a chainring size between 28 and 38 teeth.

Wiktor the inventor will give you any details you want. Available in silver, white, or black. Much prettier than three chainrings! Shipped in compact box from Poland in only a few days.

That being said, does not belong on a race bike. EFNO on front with a geared hub and belt drive would be the ideal city commuting bike.
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