Odyssey Thunderbolt Black is a well-performing two-piece crankset. Some of the advantages of a two-piece crankset are low weight, easy installation and effective power transfer. With the aim of optimizing strength, the Thunderbolt Black crank arms have a square shape that also facilitates your arm-catches when performing tailwhips or other tricks. This Odyssey crankset is compatible with both left hand drive and right hand drive. 41-Thermal processed chromoly gives a super solid chromoly construction. Short crank arms with a length of 160 - 165 mm are very responsive and have slightly more pop because your feet will be closer together.