For those who go up only to go down. Truvativ X0 AM (All Mountain) Crankset uses the "old" 64/104 BCD that's been around forever and consequently allows the use of a true granny gear, the 22 tooth. The benefits of the smaller BCD allows the use of a bash guard and a standard chainline. The arms are made of molded hollow carbon with alloy bits at the ends for your pedals and the spider, making the cranks super light, strong, and stiff.
Unidirectional carbon fiber arm mated to a 4-arm spider with insert-molded aluminum pedal and spindle-interface reinforcements
Optimized Q-factor with a 49.5mm chainline and a drive-side integrated GXP (24mm)
GXP (Giga X Pipe) cartridge bearing bottom bracket set sold separately
X-Glide, 10-speed All-Mountain (AM) chainring combinations optimized for climbing/descending with a bashguard for added protection