These are the Thunderbolt cranks from Odyssey - the descendant of the original Twombolts. The cranks still feature the 2-piece design with a cluster which attaches the other arm. The Thunderbolt cranks also feature an updated mating arm lug for increased durability and improved fit on the ultra-hollow 22mm spindle. The cranks also feature an open ended spindle cap. Arms and 175mm spindle weigh 1.76lbs. ###section### Product Specs Crank Type: 2pc Spindle Diameter: 22mm Includes BB: No Weight: 799g / 28.16oz ###shogun-image-section###