1×13 – The Only One

autorRotor Bike Components
fecha18th July 2018

The world’s first 13s Hydraulic Groupset for a simplified and performance optimised shifting experience

The modular platform concept crosses 4 cycling disciplines (MTB, Road, Gravel & Cyclocross) with a flexible choice of drivetrain components to match your preferred bike set-up.



Why 2x11s equals a 14s Effective Gear Range?

The 1x drivetrain is currently viewed as an MTB only system because of the perceived gear range or the scale of power cadence available to the cyclist between gear shifts.

Although the traditional 2×11 groupset has 22 theoretical gears, the Effective Gear Range is 14s due to overlap of chainring and sprocket combinations.

Why 1×13?

Focused on simplifying the cyclist’s shifting experience ROTOR believes Road, Gravel & Cyclocross riders will follow MTB in the successful adoption of single ring (1x) drivetrain.

Combined with a wide choice of 1x chainring sizes (38, 40, 42, 44, 46, 48, 50, 52, 54) our 13s cassettes can match and improve gear range and gear steps of the traditional 2×11 drivetrains.

The science behind the gear ratios

The foundation of our faith in the one-by groupset configuration is firmly based in the unique aero design of the world’s first 13s cassette.

We have put the cyclist at the centre of our re-designed 1×13 transmission by analysing real user-data thanks to our sophisticated INpower power measurement technology.

Our engineers process the primary data in the fine-tuning of our drivetrain design to deliver the optimum cadence range and the best possible cycling experience.


What are the unique benefits?

Simplified shifting

Leave behind the anticipation for the challenging front derailleur shift in the crucial race moment to avoid chain loss or chain suck.


Exclusive 1×13 platform is a real alternative in range and gear steps to the traditional 2×11 drivetrains.


Bigger gear range and more gear choices compared to existing MTB 1×12 systems.

Modular platform

Unique 1×13 modular platform concept fits different cycling needs with the choice of shifters, cassettes, optimised direct mount chainrings and cranks.


Simplified 1x chainring without front derailleur means reduced weight and mechanical complexity with improved aerodynamics.

Hydraulic actuation benefits

  • Maintenance free: Install, Bleed, Forget. No cables to replace, no batteries to charge.
  • Internal routing ready.
  • Lighter than battery powered and mechanical systems.
  • Hydraulic technology with proven reliability.

The tech details:

Table below show the meters developed in a 53/39 & 11-28 2x chainring drivetrain (dividing by chainring and sprocket size):


If we order them:


However the cyclist never shifts between front rings 13 times with the corresponding shifts in the cassette.

We are used to riding in the outer ring and upshift sprockets until a certain point. Then we shift down to the inner ring for optimal cadence.

With 1×13 you can bypass the traditional challenging 2x front derailleur shift so you can focus on fluid rear shifting with reduced chance of chain loss or chain suck.

See platform explained for Road / Gravel and MTB below (next page):

1×13 Road / Gravel / Cyclocross

ROTOR 1×13 platform brings a real alternative to the classic 2×11 drive trains; let’s compare a classic 2×11 (53/39 & 11-28) drive train with ROTOR 1×13 (50 & 10-39):

Furthermore ROTOR provides 4 different cassettes sizes to accommodate the different spectrum of riders: 10-36, 10-39, 10-46 and 10-52.

So if we can afford a smaller total range (still bigger than 2x) and look for smaller steps in between gears, we can choose the 10-36 cassette.

Total Range Equivalence Tables:

What about MTB drive trains?

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