04 AXEL SERVICE MANUAL Page 4 REV NC
GLOSSARY OF TERMS
Arch – A support that connects the two outer lower legs of the casting so as to keep them moving
in unison.
Boss – The word used to describe an outer casting that has brake posts for V-brakes or
cantilever brakes.
Bottom Out Bumper – A rubber or elastomer device that absorbs the shock that occurs when a
suspension is compression to its limit.
Bushings – A cylindrical sleeve between a fork stanchion tube (inner leg) and a fork outer
casting (slider), which facilitates the sliding movement between these two parts.
Coil Spring – A coiled piece of metal that acts as a spring to help suspend a fork.
Compression – The phase of the suspension operation in which the wheel travels up, or travels
closer to the frame. The suspension forks reaction to a bump in the trail.
Convertible Travel – A system used to alter the travel of a suspension fork. It requires moving a
travel clip on the compression rod to a different position. This operation is accomplished by
disassembling the fork and physically moving the travel clip on the compression rod.
Crown Steerer Assembly – the stanchion legs (inner legs), the fork crown, and the steer tube
pressed together as one assembly. This assembly is then finished by adding all of the fork
internals and then outer casting (slider).
Drop Out – The end of an outer casting (slider) where the wheel attaches.
Dust Boot – Usually a piece of rubber in the shape of a cylinder with baffles to allow it to
compress as the fork compresses through its travel. Its function is to help keep dirt and water
from getting into the inner legs of the fork.
Fork Crown – The component that joins the stanchion tubes (inner legs) to the steer tube of the
fork.
MCU – (Micro-Cellular Urethane) Special urethane that is filled with tiny air cells that act like
springs when the elastomer is compressed.
No Boss - The word used to describe an outer casting that has no brake posts for V-brakes or
cantilever brakes. This casting is to be used for disk brakes only.
O-Ring – A soft, flexible neoprene or Buna rubber ring with a round cross-section, which is used
for sealing and retention.
Outer Casting – (see Slider)
Preload – A condition of compressing a spring or elastomer before the operating loads are put on
the suspension, so that it provides a stiffer spring rate.
Rebound – The phase of the suspension operation in which the wheel returns to its original
position on the ground after compression.
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