Efneo Gearbox 3

The Efneo Gearbox is a 3-speed planetary gearbox to take the place of the front derailleur. The Efneo Gearbox, like almost all other planetary gearboxes available on the market, has one specific feature: you can upshift with full load (e.g. you can push the pedals with all your strength and change the gear to the higher one). When you want to downshift, you need to stop pushing for a fraction of a second to let the gear change. It’s very easy to get accustomed to it and after a while you will do it without thinking about it.

Here is some information about it:

+Chain line remains straight on front end
+Immediate gear change and easier than a front derailleur
+It can be shifted sitting still
+Easier chain management
+Reduced Maintenance … No need for tiresome, tricky adjustments
+Since there is only one sprocket the chain length on this gearbox is constant
+The overall gear ratio is 179 percent … equivalent to a front crankset equipped with 28t/40t/50t rings.

The *eventual cost is said to be “above $300”. They are not currently in production and sales. They were just involved in a kickstarter campaign in which they exceeded their goal by 145 %. They are hoping to be delivering the product in August 2015. Right now I think this gearbox can be ordered for the cost of $240. Eventually the price will increase. Shipment is FREE for: United States, Canada, European Union, Australia, Japan and Taiwan.

Efneo Gearbox $240

HERE is an article about this product. And HERE is another article. And HERE is a 3rd article.

The first gear is running 1:1, the second a 30% increase, and the third increases the gearing an additional 25%.  Unfortunately the gear ratios offered aren’t as good on the top end as most trikes with a 3 chainring derailleur setup so top speed obtainable would be lesser. This is the equivalent of 50 tooth while most trikes have a 52 tooth large chainring. I like the idea of it having 3 “gears” in it versus the 2 “gears” found in the Patterson and Schlumpf units. I think this is a nice looking unit. It is available in 170 and 175 mm crank arms. I would want 165 mm maximum length if I were in the market for one of these. The Efneo Gearbox will have its own paddle shifter that controls the gearbox with a single shift cable. The chainring is made from a very high quality Chromoly Steel 32HRC. Efneo offers a chainring for 1/8 and 3/32 inch chains. This gearbox is not recommended for heavy duty use. In the next video installation of this gearbox is covered.

Author: Steve Newbauer

I have a few current blogs (tadpolerider1, navysight, truthtoponder and stevesmixedbag) so I am keeping busy. I hope you the reader will find these blogs interesting and enjoy your time here. Feel free to email me at tadpolerider2 at gmail dot com (@gmail.com)

2 thoughts on “EFNEO GEARBOX”

  1. The chain run is so long on a tadpole trike that cross chaining doesn’t occur like it can on a bicycle with a much shorter chain. As to the statement about the chain line remaining straight it refers to the chain on the front chain ring not moving from side to side. Again, as long as the chain is there is not any concern or effect by the time it gets to the rear cassettes.

  2. I don’t understand the statement “Chain line remains straight on front end.”

    That statement seems to mean that the chain line is defined by only one point. I thought that two points are required, the position of the chain on a front cog and the position of the chain on a rear cog. The greater the lateral difference in these positions, the greater the cross-chaining.

    Some cross-chaining is inevitable with derailleur systems. A certain amount is tolerable, but there is a limit. For instance, there are not twenty-four useful gear ratios with a three-ring front cog set and an eight-ring rear cog set. There are only ten, because the other fourteen would result in too much cross-chaining.

    If I am not wrong about this, how does the Efneo avoid excessive cross chaining with, say, an eight-ring rear cassette when it has only one cog on the front ring, which is fixed in its lateral position?

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