Wiseco (B1024) 20mm x 26mm x 23.8mm Top End Bearing Dimensions: 20mm x 26mm x 23.8mm (ID mm x OD mm x Length) When you replace your top end a new Top end bearing is a must With a new Wiseco Top End Bearing it will help keep that motor working perfectly ride after ride High-quality bearings are manufactured to the highest standards Case-hardened for maximum life and smooth operation at high engine speeds