71904 Angular Contact Full Ceramic Bearing 20x37x9mm Outer Diameter - 3 5/8 inch (3.625") the 6902 outer diameter is

the 6902 outer diameter is 28mm

Bearings Outer diameter is 35mm

Size: 30mm x 62mm x 21

Made in Japan and built with a 40° contact angle and steel cage

71904 Angular Contact Full Ceramic Bearing 20x37x9mm Outer Diameter - 3 5/8 inch (3.625") the 6902 outer diameter is71904 Full Ceramic Angular Contact Ball Bearing 20mm x 37mm x 9mm 71904 Full Ceramic Zirconium Oxide Angular Contact Ball Bearings, measures an inner diameter of 20mm, outer diameter is 37mm and the width is 9mm, Bearing is made from Ceramic. 71904 Ball Bearing Full Ceramic Angular Contact Ball Bearing Balls: ZrO2 (Zirconium Oxide) Ceramic Inner outer races: ZrO2 (Zirconium Oxide) Ceramic Cage Material: PTFE (Polytetrafluoroethylene) or PEEK