Bedienungsanleitung Dahon General (Seite 10 von 20) (Englisch)

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Shifting Gears

How a Derailleur Drive Train Works

Shifting Gears

Shifting the Rear Derailleur

Shifting the Front Derailleur

If your bicycle has a derailleur drive train,

gear-changing mechanisms include:

»» a rear cassette or free-wheel

sprocket cluster

»» A rear derailleur

»» in most cases, a front derailleur

»» 1 or 2 shifters

»» 1-3 front sprocket chainrings

»» a drive chain

There are several different types and

styles of shifting controls available:

levers, twist grips, triggers, combination

shift brake controls and push buttons.

Ask your dealer to explain the type of

shifting controls that are on your bike

and how they work.

A downshift is a shift to a “lower” or “slower”

gear, which is easier to pedal. An upshift is

a shift to a“higher” or “faster” pedal gear.

To select a gear that will make pedalling

easier on a hill, you can change the downshift

gear in one of two ways: shift the chain down

(the gear “steps” to a smaller gear at the front)

or shift the chain up (the gear “steps” to a

larger gear in the rear). A downshift moves

the chain up to a larger gear. Remember

that shifting the chain towards the centerline

of the bike is for accelerating and climbing,

which is called a downshift. Moving the chain

away from the centerline of the bike is for

speed, and is called an upshift.

Whether upshifting or downshifting, the bicycle

derailleur system design requires that the drive

chain be in a forward-moving motion and is

under some tension.

The right shifter controls the rear derailleur.

The main function of the rear derailleur is to

move the drive chain from one gear sprocket

to the other. Smaller sprockets on the rear

wheel gear cluster produce higher gear ratios.

When pedalling in higher gears, it requires

greater amount of effort, but will take you a

further distance with each turn of the pedal

crank. The larger sprockets produce lower

gear ratios, which use less pedalling effort,

but propel you a shorter distance with each

spin. Two set screws or limit screws on the

rear derailleur body are designed to restrict

the travel of the rear derailleur. By tightening

the high-rear derailleur adjustment gear

screws, it will keep the chain from shifting off

the small (high) gear. This is located on the

rear axel. Also, by tightening the low-rear

derailleur adjustment gear screws, you will

notice that the chain will stop from shifting

off the large (low) gear into the rear wheel.

When moving the chain from a smaller

sprocket (in the gear cluster) to a larger

sprocket, it will result in a downshift. Moving

the chain from the smaller sprocket on the

chainrings to a larger sprocket will result in

an “upshift”. In order for the derailleur to

move the chain from one sprocket to another,

the rider must be pedalling forward.

The front derailleur, which is controlled by

the left shifter, switches the chain between

the larger and smaller chainrings. Shifting

the chain onto a smaller chainring makes

pedalling easier (a downshift), while shifting

to a larger chainring makes pedalling harder

(an upshift). Two adjustment screws are

located on the front derailleur. The first one

is to limit the travel of the front derailleur for

the chain to be shifted upwards towards the

larger, higher pedal gears. This will not allow

the chain to “overshift.” The second screw

limits the travel of the front derailleur

towards the smaller or easier-to-pedal chain

wheel. By limiting travel, it prevents the

chain from“undershifting” by keeping the

chain from falling off the chain wheel and

onto the frame.

Your multi-speed bicycle will have a

derailleur drive train, an internal gear

hub drive train, or in some cases a

combination of the two drive trains.

NOTE:

A derailleur will only shift if you are

pedalling forward.

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