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Tech
NOTE: It's important to your safety, performance and enjoyment to understand how things
work on your bicycle. We urge you to ask a certified bike mechanic how to do the things
described in this section before you attempt them yourself, and that you have a certified bike
mechanic check your work before you ride you the bike. If you have even the slightest doubt as to
whether you understand something in this section of the manual, talk to a certified bike
mechanic.
A. Wheels
Bicycle wheels are designed to be removable for easier transportation and for repair of a
tire puncture. In most cases, the wheel axles are inserted into slots, called "dropouts" in the fork
and frame, but some suspension mountain bikes use what is called a "through axle" wheel
mounting system.
If you have a mountain bike equipped with through axle front or rear wheels, make sure
that you have the manufacturer's instructions, and follow those when installing or removing a
through axle wheel. If you don't know what a through axle is, ask your certified bike mechanic.
Wheels are secured in one of three ways:
1. A hollow axle with a shaft ("skewer") running through it which has an adjustable
tension nut on one end and an over-center cam on the other (cam action system, fig.
8a & 8b).
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