KOYO crankshaft main bearings are meticulously crafted to meet exact OEM specifications, ensuring a precise fit and superior performance. Manufactured from the highest quality materials, these bearings are designed to perfectly match both OEM and aftermarket crankshafts. Whether you're an off-road rider or a professional racer, these bearings offer exceptional durability and reliability. The KOYO crankshaft main bearing (part number SX07E39) ensures smooth engine operation, extending the life of your motorcycle's engine. Ideal for KTM, HQV, and BETA models, these bearings are a top choice for those seeking optimal engine efficiency and longevity.