Here's how the all-new SRAM Transmission mountain bike group eliminates every weak point to create a perfect shift every time.
and speculation, the new direct-mount MTB rear derailleur is here. Far more than just a new mech, it’s an entirely new system called SRAM Transmission.
As with most SRAM launches, the new design brings plenty of new nomenclatures. Now, the derailleur’s “Full Mount” slides over the dropout in a “Hangerless Interface,” with the mounting bolt attaching from the outside and threading into an Alignment Plate between the inner mount and the frame. Your frame’s design will dictate whether you use A or B, and it’s simply a matter of popping the pin housing out, flipping it, and snapping it back into place.
Or, you could measure your chainstay length, input your chainring size, and use the AXS app to determine the correct number of links. It’s also a much stronger system. By putting the rear axle all the way through it and supporting it with two mounts, it goes from a single-shear mount to a double-shear. And, it effectively lets the bike’s entire rear triangle act as a system rather than a collection of parts with weak links in the middle.
The pulley cage is now removable without tools. Notice how there’s no bolt on the back of the cage’s pivot?That’s because it just twists out, with no tools required. This makes swaps quick and easy, and if you’re packing your bike for travel, just rotate it up and out of the way; there’s no need to remove the entire derailleur from the bike.
Lastly, the cage itself is called “Inline Cage” and is angled slightly so that it works with the parallelogram to keep the lower pulley aimed directly at the chainring as it shifts across the cassette. This, among other refinements to the chainrings and new chains and cassette, all help reduce noise and keep the system running more smoothly.At launch, there are three levels of Transmission groups: XO, XX, and a new XX SL.
One last thing to note: The clutch’s damper force is stronger on Transmission derailleurs, so it requires more power to shift, making battery life slightly reduced.The new T-Type cassettes use subtle narrow-wide tooth profiles on most cogs along with well-defined ramps and shaping. The goal is to allow you to shift at any time, under any load, and have it execute perfectly and silently.
If you happen to put the chain on in the wrong “timing” during setup, SRAM says it’ll just skip ahead in your first couple of pedal strokes to get the narrow-wide timing. But once it’s on and rolling, it will shift such that the outer chain plates land on the wide teeth, and vice versa. Combined with the super stiff Full Mount derailleur, you have a system that works together to provide seamless, robust shifting.Each shift is very intentional.
This lets SRAM move the cassette outboard 2.5 mm to make up for that, so the relationship between the chain and cassette is the same as before. Yes, they look like Road Flattop chains, but no, you should not use a Road Flattop chain on this MTB group. For mullet gravel builds, use the MTB Flattop chain.
The XO bashguards have backing plates, but the XX ones save a bit of weight by bolting directly together. Fortunately, the heavier stamped XO chainring and the more heavily machined XX version are all interchangeable between any of the cranksets.
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