Gearbox

Gearbox

Gearbox

Are you like most people that really don’t like all the hassles and problems associated with a front derailleur? Now you have an alternative.

Efneo’s 3-gear front gearbox is perfect for trekking, hybrid, urban, single speed, city and folding bikes as well as for off road non-competition bikes and e-bikes.

Advantages for you

Easy to start from the first gear

With efneo you can reduce to the first gear in a standstill – like in a car – and start easily in 1st gear.

Immediate gear change

Much quicker and easier than with a front derailleur.

Hub Full

Reduced maintenance

No need for tiresome, tricky adjustments.

No chain-skewing

No chain-skewing and chain-dropping when paired with a rear derailleur.

How it works?

1ST GEAR

front derailleur

Three chainrings of different
size rotating at the same speed

1ST GEAR – SAME SPEED AS CRANK

efneo gear

One chainring, rotating with
different speeds on three different gears

2ND GEAR

front derailleur

Three chainrings of different
size rotating at the same speed

2ND GEAR – 43% QUICKER THAN CRANK

efneo gear

One chainring, rotating with
different speeds on three different gears

3RD GEAR

front derailleur

Three chainrings of different
size rotating at the same speed

3RD GEAR – 79% QUICKER THAN CRANK

efneo gear

One chainring, rotating with
different speeds on three different gears

VS

ACTIVE GEAR

1 2 3
1 2 3
vs

How it works

How to put it on a bike – step by step

How to replace a Bottom Bracket: youtube video

Technical details

Gearbox type

It is a planetary gearbox.

Weight

It will add about 200-300 grams to the weight of your bike if you remove a three-chainring crankset of good quality (with aluminum cranks) and put the Efneo gearbox on your bike.

Gear ratio

Overall gear ratio is 179%.

2nd to 1st is -30%, 2nd to 3rd is+25%.

Efneo’s gearbox is equivalent to a front crankset with 28T/40T/50T chainring.

Frame compatibility

You can put Efneo gearbox on any frame designed for a tapered square axle bottom bracket 68mm (ISO/English), used in almost all of the city, urban, single-speed, hybrid, trekking bikes, as well as trikes & recumbents.

Please, see here how to check if Efneo gearbox fits your bike.

Gear shifting

You can change gears when you are not pedaling.

You can change gears under load when upshifting a gear. You have to loosen your leg a bit when downshifting a gear (like in most bicycle gearboxes on the market).

Shifter and cable

We will be using a one-cable paddle shifter, like the one shown in this video.

Almost every cable position is possible – please, see examples here.

Chainline

44 mm

Q-factor

177 mm

Crank length

170 mm 175 mm

Gearbox disc diameter

130.6mm (graphic)

Rear transmission compatibility

Can be paired with a rear derailleur, rear gearbox or single-speed hub. For a rear gearbox check the maximum front chainring suggested by the gearbox manufacturer (they often require minimum 34T, and the Efneo gearbox has 28T); this condition does not apply to bikes with much smaller wheels, then standard 26″-28″, for example folding bikes.

Chain / belt compatibility

We will offer a chainring for 1/8 and 3/32 inch chains.

The chainring is made from a very high quality Chromoly Steel 32HRC.

Soon we’ll offer a sprocket for a carbon belt (Gates Carbon Drive®, CDX 46T size).

Installing gearbox on your bike

Installation is presented shortly on this video.

The gearbox package includes:
– a rigth crank, with a gearbox inside,
– a left crank,
– a square tapered axle bottom bracket,
– a shifter, with a cable,
– a complete installation manual.

Maximum torque

We guarantee the Efneo gearbox works perfectly in all conditions except for extreme off-road applications like downhill or professional MTB.

Coating and colors

Crank will be painted. Black and silver versions will be available.

No embossed / engraved logo will be put on the crank, so you can also repaint the gearbox, if you wish.

Pre-sales on Indiegogo


click here to go to the Indiegogo campaign

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