Dirt Rag Magazine

SRAM unveils 7-speed XO1 downhill drivetrain


With the drive forward to stuff ever more gears onto rear hubs, it is nice to see SRAM take a step back and create a group with less gears simply because that is what makes the most sense for the application.

The real key to this system is the new 7-speed X-Dome mini-block cassette in a 10-24 range. Most downhill bikes are equipped with road-geared cassettes with something like a 12-26 range and 10 speeds. While this was plenty of range for a downhill bike, the tight gear ratios meant often shifting two or three gears at once to get to the desired ratio.


A similar range, with less gears means bigger jumps between gears and less shifting. Many riders of XX1 and X01 11-speed groups (with the 10-42 cassette) have discovered the same thing, that these larger jumps between gears is actually better suited to the way most people ride. This setup only works with the XD cassette body from the X01 and XX1 11 speed groups.

Read more about the new drivetrain here.

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