bicycle mechanics and repair decal mechanical engineering 98 198 spring 14 lecture 4 n.
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Bicycle Mechanics and Repair Decal Mechanical Engineering 98/198 Spring 14 Lecture 4. Components. Shifter. Cable. Front Derailleur. Gear Basics. Cassette/Freewheel. Front Chain Rings. Gear Ratios. A gear ratio = number of teeth on the front chain ring

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components
Components

Shifter

Cable

Front Derailleur

gear basics
Gear Basics
  • Cassette/Freewheel
  • Front Chain Rings
gear ratios
Gear Ratios
  • A gear ratio =

number of teeth on the front chain ring

number of teeth on the back sprocket

  • Lower ratios make it easier to pedal
proper shifting
Proper Shifting
  • Shift only when pedaling forward.
  • Avoid “crossing” the chain as much as possible.
  • Do not shift when pedaling hard (up a hill).

Crossed Chain

what are shifters

What are shifters?

Shifters are devices on your handlebars, stem or downtube that allow you to change gears

Downtube shifters

STI shifters

types of shifters
Types of Shifters

Stem-mounted shifters

Index shifter with integrated brake lever

types of shifters1
Types of Shifters

Bar-end shifter

Twist-style shifters

how shifters work
How shifters work
  • 2 functional types of shifters
    • Indexed (Preset positions, “click” shifting)
    • Friction (Undefined positions, analog)
slide12

Shifter Cables

Cable head can be cylindrical

(modern)

Cable head can be a disc

(vintage)

http://harriscyclery.net/product/ejac-french-gear-shift-cable-2367.htm

shifter housing
Shifter Housing

Necessary for indexed shifting

Can be used for tension shifting

front derailleur types
Front Derailleur Types

Top Pull Bottom Pull

front derailleur types1
Front Derailleur Types

Double

(also clamped)

Triple

(also braze-on)

how does it work
How does it work?!

Pushes the chain to a different chainring

slide17

Campy EPS http://www.youtube.com/watch?v=j9SgACoEQoE

Chain jumps to a larger chainring

Chain falls to a smaller chainring

shifting mechanism
Shifting Mechanism

Possible cable directions

Limit screws

=

Chain

installation
Installation

Align the bottom of derailleur cage to be lightly above the largest chainring

Angle cage by a couple degrees toward the rear of the bike

Source: parktool.com

initial set up upper limit screw
Initial Set Up-Upper Limit Screw

Step 1: set gears as shown above

Step 2: turn HIGH adjustment screw until a small gap on the right side is achieved

Source: techdocs.shimano.com

initial set up lower limit screw
Initial Set Up-Lower Limit Screw

Step 1: set gears as shown above

Step 2: turn LOW adjustment screw until small gap is achieved as shown

Step 3: tension and secure cable to derailleur

Source: techdocs.shimano.com

initial set up upper limit screw1
Initial Set Up-Upper Limit Screw

Step 1: set gears as shown above

Step 2: turn HIGH adjustment screw until a small gap on the right side is achieved

Source: techdocs.shimano.com

initial set up adjusting shifting
Initial Set Up – Adjusting Shifting

Step 1: set gears as shown above

Step 2: turn the barrel adjuster counter-clockwise until a small gap on the left side is set. Go through all gears and fine-tune.

Source: techdocs.shimano.com

setting limit screws
Setting Limit Screws

Set gears as shown above

Set gears as shown above

Turn LOW adjustment screw until small gap is achieved as shown

Turn HIGH adjustment screw until a small gap on the right side is achieved

Source: techdocs.shimano.com

fine adjustment trim
Fine Adjustment (trim)
  • A properly tuned derailleur will shift between all front gears and not throw the chain off the chainrings.
  • Even a well-adjusted derailleur may rub in some gear combinations

Counterclockwise = screws adjuster out = increases cable tension = Moves derailleur outward

Clockwise = screws adjuster in = loosens cable tension = Moves derailleur inward

problem 1
PROBLEM #1
  • Max has a problem. Recently, he found that it was much harder to pedal than usual. What could be wrong with his bike?
problem 2
PROBLEM #2
  • Austin has a problem. He tells us that he hears noises from his chain. What could be wrong?
problem 3
PROBLEM #3
  • Chris has a problem. He has trouble braking! The brake levers are hard to pull and the bike has no stopping power. What could be wrong?