Prototype SRAM blackbox 7-speed DH cassette XX1 style derailleur
Prototype SRAM blackbox 7-speed DH cassette and XX1-style derailleur. Photo: Seb Kemp/ spotted this 7-speed cassette aboard Stevie Smith’s Devinci at the Fort William World Cup Downhill race this past weekend.

Moving the chain across it is a very short caged XX1-style derailleur with a horizontal parallelogram and the wide/narrow teeth on the pulley wheels. The knuckle’s emblazoned with the Blackbox logo and holds a clutch mechanism. Word is some of the athletes like a full featured wide range cassette, and some just want a wider range between cogs…but fewer of them. No official word from SRAM, but hit the source link for more commentary and quotes.


  1. it’s basically an XX1 cassette without the 4 largest tooth cogs, so its spaced out from the driveside hub flange. so its a 7 speed cassette with 11 speed spacing

    sam hill and aaron gwin were running the same setup.

What do you think?