The SRAM X.9 Mountain Double crankset features a light and mega-stiff hollow forged aluminium crank arm mated to a forged aluminum spider for the ultimate in cross-country or all-mountain performance. Complete with 22/36 or 24/38 gearing and a matching bashguard, these also come with BB30 steel cartridge bearings.
BB30 steel cartridge bearing set included for 68/73mm shells
X-Glide, 10-speed All-Mountain (AM) chainring combinations optimized for climbing/descending with a bashguard for added protection
Had this installed (22/36) while purchasing a Salsa Spearfish. Having a bit more of a bail out gear in the mountains makes all the difference for older legs and lungs. Haven't really missed the big gears even on long and steep fire road descents though that may have more to do with not wanting to risk brittle bones.