Schwinn 12in Tiger Owner's Manual page 24

Freewheel
derailleur
cogs
Rear
Guide
derailleur
pulley
Front
chainwheels
24
©2010
External Gears (derailleur equipped bicycles)
Derailleur equipped bicycles all have a rear derailleur. Some may also have a front
Derailleur
control cable
derailleur offering more gear choices. The right side shifter will operate the rear
Front
derailleur, and the left side (if equipped) will operate the front derailleur. On derailleur
equipped bicycles, it is important to be pedaling forward when shifting gears. This
allows the chain to "derail" from one gear to the next. Operating the shifter while
sitting still or not pedaling can cause damage to the system, and can be dangerous,
as the chain may jam and cause the bike to become unstable. (Fig. 2.15)
Avoid back pedaling on any bicycle with derailleurs. Backpedaling can derail the
chain and cause it to jam or fall off the gears. When shifting gears, make sure you pedal
forward until the gear has completely changed. (At least one full rotation of the pedals.)
Failure to do so, may result in the chain not engaging properly the next time you pedal
forward, or falling off altogether causing a possible danger when you attempt to pedal
again. Remember always pedal through the gear change on a derailleur equipped bicycle.
Crank arm
Pedal
Rear Shifter
2.15
The rear shifter (right) will have an indicator that reads either "low to "high" or a series
of numbers from 1 up. Low or "1" is the lowest gear. This is used for slower riding, hill
climbing, or to allow for easier pedaling. It is recommended to start off in this gear and
move through the gears as speed increases as needed, or comfortable. It is OK to ride
the whole time in only one gear if this is comfortable. Shift only while pedaling forward
and seated. When shifting, lessen the pressure exerted on the pedals during the shift.
Once you have successfully shifted gears, it is OK to start to pedal hard if desired. Pedaling
hard while shifting can cause the chain to skip and not engage the appropriate gear.
Backpedaling should be avoided on derailleur bikes because the chain can jam and
cause the bike to become unstable. See Assembly and Maintenance for further
information on proper gear adjustment. (Fig. 2.16)
2.16