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The number of possible gear combinations (“speeds”) is the product of multiplying the number of sprockets at the rear of the
drivetrain by the number of sprockets at the front (6 x 2 = 12, 6 x 3 = 18, 7 x 3 = 21 and so on).
a. Shifting Gears
There are many different types of shifter mechanisms, each preferred for specific types of application because
of its ergonomic, performance and price characteristics. The designers of your bike have selected the shifter
design which they believe will give the best results on your bike.
The vocabulary of shifting can be pretty confusing. A downshift is a shift to a “slower” gear, one which
is easier to pedal. An upshift is a shift to a “faster”, harder to pedal gear. What’s confusing is that what’s
happening at the front derailleur is the opposite of what’s happening at the rear derailleur (for details, read
the instructions on Shifting the Rear Derailleur and Shifting the Front Derailleur below). For example, you can
select a gear which will make pedaling easier on a hill (make a downshift) in one of two ways: shift the chain
down the gear “steps” to a smaller gear at the front, or up the gear “steps” to a larger gear at the rear. So,
at the rear gear cluster, what is called a downshift looks like an upshift. The way to keep things straight is to
remember that shifting the chain in towards the centerline of the bike is for accelerating and climbing and is
called a downshift. Moving the chain out or 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 moving forward and be under at least some tension. A derailleur will shift only if you are pedaling forward.
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
to another on the rear gear cluster, thereby changing gear drive ratios. The smaller sprockets on the gear cluster produce
higher gear ratios. Pedaling in the higher gears requires greater pedaling 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 pedaling 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 an upshift. In
order for the derailleur to disengage the chain from one sprocket and move it on to another, the chain must be moving forward
(i.e. the rider must be pedaling forward).
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