Bicycle Mechanics and Repair Decal Mechanical Engineering 98/198 spraaang 2014 Lecture 9

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Bicycle Mechanics and Repair Decal Mechanical Engineering 98/198 spraaang 2014 Lecture 9 “Nobody likes a naughty atom because you always have to keep an ion them”

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Bicycle Mechanics and Repair Decal Mechanical Engineering 98/198 spraaang 2014 Lecture 9. “Nobody likes a naughty atom because you always have to keep an ion them”. Different Component Brands. What are “Group” Components?. Derailleurs. Shifters. Brakes. Chain Rings/ Crank Arms*. - PowerPoint PPT Presentation

Transcript of Bicycle Mechanics and Repair Decal Mechanical Engineering 98/198 spraaang 2014 Lecture 9

Page 1: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Bicycle Mechanics and Repair DecalMechanical Engineering 98/198

spraaang 2014

Lecture 9

“Nobody likes a naughty atom because you always have to keep an ion them”

Page 2: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Different Component Brands

Page 3: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

What are “Group” Components?Brakes

Shifters Derailleurs

Cassette/FreewheelChain Rings/ Crank Arms*

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Other ComponentsHeadset

Bottom Bracket

Wheels

Pedals

Saddle/ Seat PostStem/ Handlebars

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Page 6: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Cost

• Cost of components is usually due to precision, durability, materials, and weight.

• Each of the main three brands has many different grades of components to fit different needs.

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Example: Shimano Components

$34.99$49.99

$89.99

$124.99$299.95

Page 8: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

ComponentsHeadset

Stem

Page 9: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Introduction to Headsets

• Allows for fork rotation relative to the bicycle frame

• Consists of two cups with ball bearings that press into the top and bottom of the head tube

Page 10: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Headset Types - Threaded

• Locknut holds bearings in place• Fork steerer tube is threaded• Stem descends into headtube

Page 11: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Threaded Headset Exploded View

Bearing Cartridge

Adjustable Race

Upper Head-tube Race

Quill Stem

Wedge

Locknut

Washer

Threads

Page 12: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Threaded Headset

Triangular wedge holds stem inside steerer tube

Nuts keep bearings tensioned

Long bolt tightens wedge below

The stem does not effect the bearingadjustment

Page 13: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Headset Maintenance

Threaded Headsets- Unthread Locknut- Remove spacers- Unthread top race- Clean and grease bearings!

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• Stem clamps to steerer tube• No locknut• Cap bolt holds assembly in place

Headset Types - Threadless

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Threadless Headset Exploded View

Cap Bolt

Top Cap

Stem

Spacers

Comression Ring

Adjustable Race

Bearing Cartridge

Upper Head-tube Race

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Threadless Headset

Star nut grabs the inside of the steerer tube

Top cap pushes on stem and spacers

Spacers push on bearings

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Standard Threadless Headset- Remove stem and spacers- Remove fork- Clean bearings and grease!

For sealed bearing headsets, replace bearings if needed

Page 18: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Threaded vs. Threadless

http://www.sheldonbrown.com/headsets.html

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• Same in function as threadless headset

• Cups are pressed into frame

• Bearing assembly sits inside head tube

• Bearings may be housed inside cartridges that are easily removed

Headset Types - Integrated

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Common ProblemsShakiness

The headset is not adjusted tight enough

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StiffnessThe headset is adjusted too tight

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Headset tools

• Headset Wrench

• Headset Press• Headset Remover

Page 23: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

So e-z, a kid can do it!

http://www.youtube.com/watch?v=yn0BMR62C2k

Page 24: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Preloading Your Headset

- Tighten the top cap- Check for rattle by

bouncing your frontwheel

- Check for stiffness byswinging your handlebars

Page 25: Bicycle  Mechanics and Repair Decal Mechanical Engineering  98/198 spraaang  2014 Lecture 9

Challenge