2
intROduCtiOn
The drivetrain consists of the parts of the bicycle that transmit power
to the rear wheel:
• Pedals (and toe-clip assemblies on some models)
• Crankset and bottom bracket- left and right crank arms,
chainring(s), and bottom bracket (the axle and bearings on which
the crankset rotates)
(Figure 1)
• Cassette and chain
When the drivetrain is
working properly, shift-
ing is easy, your bike is
quiet, and its efficiency can
reach its maximum. Read
and follow the sections
that discuss the parts that
comprise the drivetrain to
make sure all the parts are
working properly.
Carbon fiber composite
The Bontrager Race XXX
Lite crankset is made from
OCLV carbon fiber com-
posite. Carbon fiber is among the strongest materials used in bicycle
manufacture. However, carbon fiber has unique qualities, different from
metal parts, and must be inspected carefully for damage. Follow the
inspection procedures in the Maintenance section.
Figure Exploded diagram of Race XXX Lite crankset
WaRninGa damaged carbon fiber part can fail suddenly, causing
serious injury or death. inspect a carbon fiber bicycle or
parts for damage frequently. if you suspect a carbon fiber
part is damaged, immediately stop riding the bicycle. before
riding, replace the part or take the bike to your dealer for
service.
Introduction