1. Bicycle Mechanics and Repair Decal Physics 98/198 Spring 14 Hubs and Ball Bearings

2. Thinner, lighter, stronger, more accurately made and more expensive than parts made by other methods such as casting
1992 Bridgestone Catalog

3. Gravity-cast parts are not as strong as cold-forged parts, although they are often indistinguishable by look.
1992 Bridgestone Catalog

4. Melt-forged parts are not as strong as gravity-cast parts or cold-forged parts, but are still strong and affordable.
1992 Bridgestone Catalog

5. Investment Casting 1993 Bridgestone Catalog

6. 1993 Bridgestone Catalog

7. 1993 Bridgestone Catalog

8. Bulge-Forming (Hydoforming)
1993 Bridgestone Catalog

9. 1993 Bridgestone Catalog

10. 1993 Bridgestone Catalog

11. Marin Bikes
1993 Bridgestone Catalog

12. Stamping 1993 Bridgestone Catalog

13. 1993 Bridgestone Catalog

15. Components - Hubs

17. Hub Body
Axle
Locknut
Cone

18. Cup
Axle
Bearings
Cone
Locknut
Hub Body
Quick Release Skewer

19. ←………!

20. Types of Ball Bearings Radial contact Axial contact Four point contact
Angular contact

21. Angled Contact Bearings
Allows wheel to spin about axle
Radial and lateral load bearing

22. Hub Bearings
Cup and cone assembly

23. Where Else Can We Find Bearings?

24. Sealed Bearings

25. Takes High Radial Force
Reduces Gunk Buildup on ball bearings

26. Bearings are sometimes sealed Bearings should always be greased.
Axle rotates on bearings so they roll with as little friction as possible.
Bearings are sometimes sealed
Bearings should always be greased.
Always try to replace bearings when opening a hub, bottom bracket or headset. They are cheap!

27. Tightening Cones