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4. Tech
It’s important to your safety, performance and enjoyment to understand how things work on your bicycle. We urge you to ask your dealer how
to do the things described in this section before you attempt them yourself, and that you have your dealer check your work before you ride the
bike. If you have even the slightest doubt as to whether you understand something in this section of the Manual, talk to your dealer. See also
Appendix A, B, C and D.
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 your dealer has given you 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 dealer.
Wheels are secured in one of three ways:
• 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.8 a & b)
• A hollow axle with a shaft (“skewer”) running through it which has a nut on one end and a fitting for a hex key, lock lever or other tightening
device on the other (through bolt, fig. 9)
• Hex nuts or hex key bolts which are threaded on to or into the hub axle (bolt-on wheel, fig. 10)
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