As bike brands updated their frames to use UDH, they were effectively giving their bikes a hanger-less design, and SRAM was busy working on a direct-mount rear derailleur that would take full advantage of that standardized interface.īefore we get too far, you’re probably wondering: It began years ago with the UDH (Universal Derailleur Hanger), giving every frame manufacturer a single, well-defined design parameter for rear derailleur placement in relation to the cassette/freehub body. Just assemble it and it’s perfectly aligned.īut that’s just the beginning … How SRAM Transmission Sets Up Differently So, there are no adjustment screws needed because there are really no more adjustments needed. Now the freehub body, cassette, and rear derailleur fit together perfectly, automatically and always. So, SRAM designed a system that eliminated all of that slack and, thus, the adjustments.

That meant parts needed a lot of built-in adjustability, particularly the rear derailleur.īut all those points of adjustment are only there to take up the slack between frames and components. When you start mixing and matching parts across brands, small individual tolerance outliers add up to big differences from bike to bike. SRAM says (and we’ve all likely experienced) that at a minimum, variations in frames and dropouts have necessitated things like barrel adjusters and fine-tuning during setup. With a transmission, there’s no mixing or matching - it’s a complete group that’s optimized as a system. Meaning, with a drivetrain, there are lot of different parts from different brands with different tolerance stacks that could be used together. Three distinct versions - XO, XX, and XX SL - will come as complete groups, and it’s called a “transmission” because everything is interdependent in ways that current “drivetrains” are not.

Far more than just a new mech, it’s an entirely new system called SRAM Transmission. After months of spy shots and speculation, the new direct-mount MTB rear derailleur is here.

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