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

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Presentation transcript:

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

Thinner, lighter, stronger, more accurately made and more expensive than parts made by other methods such as casting 1992 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

Gravity-cast parts are not as strong as cold-forged parts, although they are often indistinguishable by look. 1992 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

Melt-forged parts are not as strong as gravity-cast parts or cold-forged parts, but are still strong and affordable. 1992 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

Investment Casting 1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

Bulge-Forming (Hydoforming) 1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

Marin Bikes 1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

Stamping 1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

1993 Bridgestone Catalog http://www.sheldonbrown.com/bridgestone/index.html

Components - Hubs

Hub Body Axle Locknut Cone

Cup Axle Bearings Cone Locknut Hub Body Quick Release Skewer

←………!

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

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

Hub Bearings Cup and cone assembly

Where Else Can We Find Bearings?

Sealed Bearings

Takes High Radial Force Reduces Gunk Buildup on ball bearings

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! http://mtobikes.com/tight-hubs/ http://www.sheldonbrown.com/gloss_an-z.html

Tightening Cones