Connecting rod and crankshaft main bearing set for motorcycle engine rebuild.Includes 8 pieces of connecting rods and 10 pieces of crankshaft bearings.Standard shaft diameter is 40mm, with available oversized options of +25, +50, +75, and +100.Connecting rod inner shaft diameter and crankshaft bearing inner diameter both measure 40mm in standard size.As the outer size increases, the shaft diameter decreases while the bearing wall thickness increases accordingly.Constructed from aluminum tin for enhanced.Designed to improve pressure resistance, fatigue resistance, and anti-occlusion performance, contributing to better engine and extended service life.Suitable for use in select motorcycle models manufactured between 1996 and 2007.