GTRO 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 GTRO 3-speed 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.

“It’s a clever and cool project that might be interesting if you’re into bikes, cleverness or coolness.”

“In an effort to make things quicker and easier, Efneo has developed a 3-speed planetary gearbox to take the place of the front derailleur.”

“If you have ever thought that there must be a better way to change gear than with the traditional front derailleur, then maybe the Efneo 3-speed front gearbox is what you’ve been looking for.”

GTRO Gearbox

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. Change gear when pedalling and in a standstill.
  • No chain-skewing No chain-skewing and chain-dropping when paired with a rear derailleur.
  • Easy to install The easiest front gearbox to install ever. No frame modifications necessary.
  • Reduced maintenance No lubrication necessary.

Technical details

  • Application Efneo’s GTRO Gearbox is dedicated for all non-competition bikes like touring, city, e-bike, folding, recumbent, trike. It has been heavily tested in various conditions (on-road, off-road and laboratory tests, including winter tests). However, it has not been tested for competition MTB, downhill or dirt applications.
  • Gear ratio GTRO’s 1st gear is a neutral gear (1:1). Second and third gears are incremental. GTRO’s standard chainring is 28T.
    Gear Ratio Teeth equivalent for 28T
    1st 1:1 28T (physical chainring size)
    2nd 1:1,43 40T (physical chainring size)
    3rd 1:1,79 50T (physical chainring size)
  • Interface GTRO Gearbox is compatible with most bicycle frames using standard square tapered 4 flats BB’s with 68 mm or 100 mm wide BB shells, with English thread. BB shell diameter can not exceed 45,6 mm.
  • Gear shifting Efneo’s GTRO Gearbox is delivered with a dedicated trigger or grip shifter.
  • Rear transmission compatibility Compatible with any rear transmission  (derailleur, geared hub, single speed hub, rear motor) except fixed wheel. For internal geared hub, please check manufacturer’s specs for the smallest front chainring allowed.
  • Learn more in full technical specification.
    Full technical card
How it works

Bike types

GTRO for E-bikes

Rear-wheel electric motor e-bikes are popular in urban/city segment. They usually look more elegant and sleek than mid-drive e-bikes.

Efneo’s GTRO paired with a rear-wheel motor makes a bike practical, stylish and maintenance-free. Three gears are just enough for urban applications. First gear to start (even uphill), second to accelerate or cruise, third to ride at top speed with an acceptable cadence.

There are various manufacturers collaborating with Efneo and testing GTRO on their e-bikes with very positive feedback!

Our objective is to make GTRO the first choice for this segment.

To give you a better idea of how exploding this market is – according to eCycleElectricConsultants 34 million e-bikes were sold worldwide in 2017, mostly in China and Europe.

GTRO for Folding bikes & e-bikes

Folding bikes segment belongs to the fastest growing in the cycling industry. Folding e-bikes are becoming a first choice of transportation for modern city dwellers in crowded European cities.

Efneo’s GTRO is a perfect match for folding bikes & e-bikes. All small-wheel bikes are facing the same challenge – at high speed, the chainring quickly becomes too small and the cadence skyrockets. On the other hand, front derailleurs are too spacious to be used and only small-range rear derailleurs can be applied, due to bike’s small size.

With the GTRO a bike’s designer gets much more flexibility. The physical chainring (or beltring) is small, while virtually it gets very large on a 3rd gear. With a folding e-bike, no rear derailleur is necessary to make gear shifting possible.

We are showing GTRO on Strida and Brompton, two top brands with which GTRO is now technically compatible. For both bikes GTRO offers better gear ratios, shifting & ride comfort and (as far as we know) higher reliability than original gear systems used on these brands.

Our objective is to make GTRO the first choice for all mid- and high-end folding brands on the planet.

GTRO for Urban bikes

Urban bike is a category for which gearboxes (like our GTRO) were made. Urban bike users and manufacturers do not favor derailleurs. Efneo’s GTRO is sleek, elegant, practical and comfortable.

Efneo’s GTRO design fits modern urban bikes perfectly.

Unlike rear wheel e-bikes and folding bikes, front gearbox (like GTRO) will never be a first choice for urban bike designers (mainly due to its price), but we want it to be an attractive option for OEM designers and retail upgraders.

GTRO for Touring bikes

A touring bike needs a vast gear ratio. That is why it usually uses both rear and front derailleurs. In the past, it used to be 3×8, now it’s rather 2×10 or 2×11. The reason for migrating from 3 to 2 chainring on a front crankset is that nobody really likes front derailleurs. Frankly saying, most people hate it.

Howerver, they still need it. Large rear cassettes like 11-42 have less around 400% gear ratio, which is usually too little for a real touring bike.

A rear cassette combined with GTRO offers all of the best from both worlds of gearboxes and derailleurs. GTRO adds the ability to reduce to the low gear after stopping and eliminates chain skewing or chain dropping. And you should feel how it upshifts when accelerating – nothing compares to this!

Moreover, you can use even the largest rear cassette and still be within the range of your derailleur’s cage. It also makes the bike designer’s work much easier.

GTRO for Compatibility with belt systems

One of the trends in the cycling industry is the growing popularity of belt systems. Unlike a chain, a belt is silent, clean (does not need lubrication) and more efficient energetically.

Moreover, if one wants a rear-wheel engine e-bike to be geared, front gearbox like GTRO is the only option. And most e-bike motors today still need some gears, at least when starting and at top speed.

GTRO is now offered with a 130BCD adapter that fits standard belt front sprockets from industry leaders like Carbon Gates or Continental. It can be also used for Strida, which always comes with a belt as a default option.

GTRO for Trikes & recumbents

GTRO is a perfect choice for any trike or recumbent for three reasons.

Firstly, it’s even more important to be able to downshift to the 1st gear after stopping on a recumbent than on a standard bike.

Secondly, keeping the chain tension is much easier with a single front chainring than with 2 or 3 chainring crankset.

Thirdly, it’s a safety matter. When things go wrong and you hit something, the bom is broken, it’s much safer to have a GTRO with its chainring fully covered than a bare chainring that comes with most standard cranksets. It can make a big difference.

How to install

  • Manuals Click here to go to the manual section. You’ll see how to install the gearbox, how to change the shifter or shifting cable etc.
    Manuals & Tutorials
  • Check before you buy Click here and read carefully how to check your bike’s compatibility with the Efneo’s GTRO Gearbox.
    Check before you buy

Testimonials and reviews

Check out what Bikerumor.com
wrote about us

Check out what Bikerumor.com
wrote about us

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Check out what road.cc
wrote about us

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Check out Chris's opinion

Check out Chris's opinion

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Buy Efneo’s GTRO

  • GTRO
  • GTRO for trike/recumbent
  • GTRO for folding
  • GTRO for ebike
  • GTRO Accessories

This is a GTRO for a standard full-size bike. GTRO standard
comes with a full-size shifting cable, that you can easily adjust to
your desired length

GTRO

  • Color
    Black
    • Black
    • Silver
  • Shifter
    Rapid-fire
    • Rapid-fire
    • Twist-grip
    • Bar-end
  • Bottom bracket
    68 mm
    • 68 mm
    • 100 mm (Fat bike)
  • Chain/belt
    Chain 28T
    • Chain 28T
    • Chain 38T
    • Belt adapter (130BCD, 5 bolts)

We ship to the United States, Canada, European Union (including the UK), Switzerland, Japan and Australia.

In the Box

Total Price

$499.00

This is a GTRO for a trike or recumbent bike. The only differences to the GTRO standard are
1) different positioning of a reaction lever,
2) longer shifting cable.

GTRO fol trike/recumbent

  • Color
    Black
    • Black
    • Silver
  • Shifter
    Rapid-fire
    • Rapid-fire
    • Twist-grip
    • Bar-end
  • Bottom bracket
    68 mm
    • 68 mm
    • 100 mm (Fat bike)
  • Chain/belt
    Chain 28T
    • Chain 28T
    • Chain 38T
    • Belt adapter (130BCD, 5 bolts)

We ship to the United States, Canada, European Union (including the UK), Switzerland, Japan and Australia.

In the Box

Total Price

$499.00

At first, choose your folding bike brand. We’ll do the rest to make your GTRO compatible with your bike.
You can also choose your shifter type. Other options depend on your bike brand.
If your bike’s brand is not on the list, please email us and we’ll advise if we can deliver a GTRO for your bike – service@efneo.com

GTRO for folding

  • Folding bike
    Brompton
    • Brompton
    • Strida
  • Color
    Black
    • Black
    • Silver
  • Shifter
    Rapid-fire
    • Rapid-fire
    • Twist-grip
    • Bar-end

We ship to the United States, Canada, European Union (including the UK), Switzerland, Japan and Australia.

In the Box

Total Price

$599.00

At first, choose your ebike brand. We’ll do the rest to make your GTRO compatible with your bike.
You can also choose your shifter type. Other options depend on your bike brand.
If your ebike’s brand is not on the list, please email us and we’ll advise if we can deliver a GTRO for your ebike – service@efneo.com

GTRO for ebike

  • Ebike
    Sondors fat-bike
    • Sondors fat-bike
    • Bike with a Zehus engine
  • Color
    Black
    • Black
    • Silver
  • Shifter
    Rapid-fire
    • Rapid-fire
    • Twist-grip
    • Bar-end
  • Chain/belt
    Chain 28T
    • Chain 28T
    • Chain 38T
    • Belt adapter (130BCD, 5 bolts)

We ship to the United States, Canada, European Union (including the UK), Switzerland, Japan and Australia.

In the Box

Total Price

$499.00$512.00

NOT YET