Crankshaft Bearing. ProX offers a wide range of crankshaft bearings of well known brands like Koyo, NTN, etc. in C3 and C4 graduations. The high quality bearings will fit perfectly to OEM and aftermarket crankshafts. ProX crankshaft bearings are manufactured at leading O.E.M. factories, mainly in Japan. All bearings are made to exact O.E.M. specifications, to ensure maximum quality and performance. ProX uses respected brands like Koyo and NTN to ensure quality. These brands are used by O.E.M. brands like Yamaha, Kawasaki, Honda, Suzuki and KTM. ProX bearings offer high durability. The Pro-X crankshaft bearing is built to O.E.M. specification for a true factory fit. Note: Sold individually.