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.
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.