Bombshell Rocket SLR SQ cranksVol no. 2 Bombshell Rocket SQ cranks Better, stronger, lighter and stiffer. Using one of the best aluminum helped us maintain low weight while increasing strength and stiffness. CNC machined in USA. 4 bolt spider 104 BCD compatible with Bombshell and all 104 BCD 4 bolt chainrings. Works with SQ bottom brackets. colors : blue, red, gold, purple, black, pink, light green, gun titanium weight: 135 mm 10. 2 oz 75 lb rider weight limit