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.

Buy now Technical details

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. No shifter fine-tuning necessary.
  • Reduced maintenance No need for tiresome, tricky adjustments.

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 labmoratory 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 (phisical chainring size)
    2st 1:1,43 40T (phisical chainring size)
    3st 1:1,79 50T (phisical 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 compatibilty 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

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 sterring 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

Buy Efneo’s GTRO

How to order?

Choose your GTRO’s options and check out. If you want to order two or more GTROs of different configuration, choose your first configuration, click “add to basket” and then you’ll be able to come back to this place to choose
another configuration.


  • Product Color
    • Black
    • Silver
  • Product Shifter
    • Rapid-fire
    • Grip-shift
  • Product Bottom bracket
    68 mm
    • 68 mm
    • 100 mm (Fat bike)
  • Product Trike/Recumbent
    • No
    • Yes

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

In the Box

Total Price


GTRO in other configurations

In near future we will be offering a GTRO in other options: color – black.
If you’re interested in purchasing a GTRO with such option(s) please leave us your e-mail.
We will update you as soon as it’s available.
Check below in which option you are interested.

Order to your country

At this moment GTRO is only available in selected countries.
Please leave us your e-mail and your country name – we will inform you as soon
as GTRO is available in your country!