New direct-Mount Derailleur signals Potential Challenge to SRAM’s UDH Standard
A new rear derailleur from Ratio, a relatively unknown brand, is generating buzz for its potential to disrupt SRAM’s Universal Derailleur Hanger (UDH) dominance. Spotted at the Made handmade bike show, the Ratio Mech derailleur offers compatibility with a wider range of cassette sizes and mounting standards than SRAM’s current offerings, alongside features designed for user serviceability and broad compatibility.
unlike SRAM’s Transmission groupsets which lack them, the Ratio derailleur incorporates conventional high and low limit screws, suggesting greater adaptability. It’s also designed to work with both UDH and conventional hanger mounts, according to a report from Bikepacking.com. This flexibility contrasts with SRAM’s push for a single, standardized UDH system across the industry.
The Ratio derailleur is engineered to accommodate almost all 1×12 and 1×13 drivetrains and will be available with cages designed for both 46- and 52-tooth cassettes – offering riders more gearing options than some current systems allow. Interchangeable fins allow adjustment for a variety of cable pulls, enabling compatibility with both Shimano and SRAM shifters on both road and mountain bike platforms.
Notably, the derailleur pictured by Bikepacking.com was shown paired with a standard SRAM cassette without visible modifications. Ratio has stated its intention to make the derailleur fully user-serviceable, a feature that could appeal to riders seeking longevity and reduced maintenance costs. The design also features clean, near-vertical cable routing and a screw cover suggesting a serviceable or adjustable clutch mechanism.
Ratio has been contacted for further comment.
