Owner's Manual

CRANK SET

In general, the crank set refers to the crank arms and the bottom

bracket assembly. Modern crank sets have been highly refined over

the years, resulting in great increases in shifting performance and

improved weight savings. Depending on the particular model of bike

that you have, you may find that your cranks are constructed of either

aluminum alloy or carbon fiber. You may also find that your crank is

equipped with either two or three chainrings, depending on the bike

model. A double chainring crank will typically be found on the more

racing specific models, while the triple chainring cranks will be

predominant on models with a range of intended uses.

There are also two main types of crank arm and bottom bracket

spindle interface systems. Your bike may be fitted with either a

splined interface, or a square tapered interface. The splined interface

system is a more recent introduction and provides for a more secure

fitting between the crank arm and spindle while increasing the overall

stiffness and efficiency of the crank set. The square tapered interface

has been the standard system for many years and is a simple and

reliable set-up.

Never ride your bike if the cranks are loose. This

may be dangerous and will damage the crank arms

beyond repair.

Bottom Bracket

Threaded Cup Spindle

Threaded

Cartridge Body

Cartridge Bottom Bracket Assembly

Square-Taper

Bottom Bracket

Left Crankarm

Chainring

Crankarm Bolt

Dust Cap

Right Crankarm

Crank Set