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

Trigger and twist grip shifters available, you can see them in this movie.

Shifters fit 22,2mm diameter handlebars.

A lot of different cable positions are possible – please, see examples here.

Chainline

40,5 mm

Q-factor

177 mm

Crank length

170 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.

Rear hub

Piasta

Rear Hub

In a few years nobody will believe we ever used hubs that did not engage immediately, sounded like angry bees, and actually braked your bike while not pedaling.

In a few years everybody will use only one type of freewheel integrated into their hub – the efneo freewheel and hub. Instant engagement – less than 1 degree of “dead space”. No noise. No braking.

Designed for all types of bicycles.

Advantages for you

Instant engagement

You push the pedal and your bike reacts immediately. Like in a super-car – hit the gas and you’re off. Instantly feel the power.

No noise

With the efneo hub you’ll only hear what you really want. It makes no noise when you stop pedaling. Quiet as a church mouse.

No braking

The efneo freewheel hub does not brake, or slow down your wheel when you are not pedaling so you glide faster, longer, and have more energy when you need it.

Hub Full

How it works?

The following graphic shows innovation of Efneo in the field of so-called „silent hubs”. The difference is only when the wheel turns, but the rear sprocket is motionless (the biker does not pedal). In traditional solutions the internal hub rollers where worn out by continuous friction against the external ring – this made the rollers smaller and smaller, what caused the hub to slip over.

Traditional Hub

traditional ‘silent hub’

The rollers are worn out, because they rub against the external ring.

This way they get small and smaller and perfectly polished. And after some time they begin to slip over

Efneo Hub

efneo active hub

The rollers do not wear out, as they rotate together with the external ring

vs

How it works?(continued)

For years the industry has been seeking a way to use another type of freewheel mechanism – the so called “silent hub” – using a concept of a roller freewheel.

This kind of hub has two major features – it engages immediately and does not make any noise – unlike all pawl and ratchet freewheels with their specific bee-like sound and inefficient rotation of the freewheel before it engages and applies power to the wheel.

All these attempts have failed for one reason – after a very short time the freewheel begins to slide and to date, the only way to prevent this was to make the freewheel extremely heavy. Until now, it is a congenital weakness of all other known roller freewheels – a much higher weight to durability factor than a pawl-and-ratchet mechanism. The weakness comes from the construc-tion in which the rollers are grinding all the time that the cyclist is not pedaling.

After a relatively short time they are worn-out and do not engage effectively when a cyclist pushes hard on his pedals. They “slide”. They all work perfectly when they are brand new from the factory but get “old” and weak very quickly.

Efneo freewheel works differently when not pedaling. The rollers are not grinding at all so the rollers do not wear out nearly as quickly as other roller freewheels did. And since the rollers are not grinding, they do not have to be made so heavy in order to continue to function properly for a very long time. Thus, efneo has invented a new freewheel that is much more efficient than the 19th century pawl-and-ratchet system and is just as durable and lightweight as the pawl-and-ratchet freewheels with the added benefit by using rollers that do not grind when not pedaling, eliminating that noisy, annoying ratcheting sound.