Mech

The Ratio Mech is the culmination of everything we have learned from five years of designing and manufacturing our own drivetrain components. Through the development of our shifter-modifying upgrade kits, combined with the notoriously challenging riding conditions in the Lake District, we developed a long list of design changes we wanted to make for our own mechanical derailleur.

Designed, manufactured and assembled here in the UK, the Ratio Mech has been created from the ground up to solve these issues.

Engineering-focused Design

Every element of the Ratio Mech has been developed with performance, durability and usability in mind.

The key features of the Mech are:

• User-serviceable and modular design
• Broad 1x drivetrain compatibility for gravel bikes and MTB
• Stainless bearings for rotating components
• Universal cable routing, without annoying tight bends or loops
• Direct Mount configuration compatible with SRAM* UDH dropouts allowing increased stiffness
• Cage Stop design for efficient wheel removal
• Drag spring clutch to limit chain slap
• Spares available on the Ratio website
• Markings and graphics aid an intuitive and simple set-up process

For a deeper look at the engineering and design decisions behind the derailleur, read Design notes: Ratio Mech.

Specifications

• Links, cage plates, mounting bolts and arms machined in the Lakes from 7075 aluminium
• B adjuster plates machined in the Lakes from 6082 aluminium
• Jockey wheels and end caps machined in the Lakes from acetal thermoplastic
• Links and jockey wheels run on stainless Enduro bearings
• Brass, steel and stainless wrap-spring serviceable clutch, machined in the Lakes
• Additive manufactured nylon knuckles made in the UK

Weight: Hanger mount/Short cage – 340g, Direct mount/Long cage – 377g

Looking for service parts?

Take a look at the Mech Service Parts product page.

To fit any of our service parts, see our video service page.

To use the Ratio Mech you will need:

1. A compatible shifter and cassette combination. See our compatibility chart for details, or use the dropdowns on the product page to explore. Please note, the Mech is not compatible with 2x drivetrains.
2. A frame with either a SRAM* UDH compatible dropout or hanger mounting. Not sure which option to choose? See our mounting guide.
3. Chain, chainring and freehub to match the brand and number of speeds of your chosen cassette.

All products we offer for sale on our website are Ratio Technology products unless stated otherwise. All third-party products, company names and logos remain the property of their respective holders and use of them does not imply any affiliation with or endorsement by them.

* Ratio Technology Limited is not in any way affiliated with, sponsored or endorsed by SRAM, LLC or Shimano Inc.