BERG CYCLES SPORTCROSS Serie Manual Del Usuario página 54

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HOW THE COMPONENTS WORK
1) SHIFTING THE REAR DERAILLEUR
The rear derailleur is controlled by the right shifter.
The function of the rear derailleur is to move the drive chain from one gear sprocket to another. The
smaller sprockets on the gear cluster produce higher gear ratios. Pedalling in the higher gears requires
greater pedalling effort, but takes you a greater distance with each revolution of the pedal cranks. The
larger sprockets produce lower gear ratios. Using them requires less pedalling effort, but takes you a
shorter distance with each pedal crank revolution. Moving the chain from a smaller sprocket of the gear
cluster to a larger sprocket results in a downshift. Moving the chain from a larger sprocket to a smaller
sprocket results in a upshift. In order for the derailleur to move the chain from one sprocket to another,
the rider must be pedalling forward.
2) SHIFTING THE FRONT DERAILLEUR
The front derailleur, which is controlled by the left shifter, shifts the chain between the larger and smaller
chainrings. Shifting the chain onto a smaller chainring makes pedalling easier (a downshift). Shifting to
a larger chainring makes pedalling harder (an upshift).
Which gear should I be in?
The combination of largest rear and smallest front gears is for the steepest hills. The smallest rear and
largest front combination is for the greatest speed. It is not necessary to shift gears in sequence.
Instead, find the "starting gear" which is right for your level of ability — a gear which is hard enough for
quick acceleration but easy enough to let you start from a stop without wobbling and experiment with
upshifting and downshifting to get a feel for the different gear combinations. At first, practice shifting
where there are no obstacles, hazards or other traffic, until you've built up your confidence. Learn to
anticipate the need to shift, and shift to a lower gear before the hill gets too steep.
It is recommended to avoid using gears combinations of extreme positions (scheme on page 21) for long
periods.
3. HOW AN INTERNAL GEAR HUB DRIVETRAIN WORKS
If your bicycle has an internal gear hub drivetrain, the gear changing mechanism will consist of:
A 3, 5, 7, 8, 12 speed or possibly an infinitely variable internal gear hub;
One, or sometimes two shifters;
One or two control cables;
One front sprocket called a chainring;
A drive chain.
a) Shifting internal gear hub gears
Shifting with an internal gear hub drivetrain is simply a matter of moving the shifter to the indicated
position for the desired gear ratio. After you have moved the shifter to the gear position of your choice,
ease the pressure on the pedals for an instant to allow the hub to complete the shift.
b) Which gear should I be in?
The numerically lowest gear (1) is for the steepest hills. The numerically largest gear is for the greatest
speed. Shifting from an easier, "slower" gear (like 1) to a harder, "faster" gear (like 2 or 3) is called an
upshift. Shifting from a harder, "faster" gear to an easier, "slower" gear is called a downshift. It is not
necessary to shift gears in sequence. Instead, find the "starting gear" for the conditions — a gear which
is hard enough for quick acceleration but easy enough to let you start from a stop without wobbling —
and experiment with upshifting and downshifting to get a feel for the different gears. At first, practice
shifting where there are no obstacles, hazards or other traffic, until you've built up your confidence.
Learn to anticipate the need to shift, and shift to a lower gear before the hill gets too steep.
E. TOE CLIPS AND STRAPS
Toe clips and straps are a means to keep feet correctly positioned and engaged with the pedals. The toe
clip positions the ball of the foot over the pedal spindle, which gives maximum pedalling power.
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