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Updated 23/05/07 RAOM0507 Apollo Bicycle Company Pty. Ltd. ABN: 60 001 914 469
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STEERING SYSTEM
Handlebar Stem
Usually the standard handlebar stem is secured
into the steering column by the binder bolt and
expander wedge. These bind with the inside of
the fork, steerer tube when tightened. The stem
may also clamp onto an unthreaded fork steerer,
as is the case with the 'Ahead Set' system.
Note: The handlebar height can be altered to suit
the rider’s preference.
To remove a standard stem, the expander bolt needs to be loosened two or three turns,
and then tapped to free the wedge inside. Servicing involves applying a thin film of grease
to the part after it has been wiped clean. Also lubricate the wedge that will be inserted into
the frame.
NOTE: These same adjusting principles cannot be applied to the ‘Ahead Set’
headstem system.
Etched on the stem is a mark about 65mm up from the bottom with the words
“max. height” or “minimum insertion”. Never ride a bicycle if the stem has been
raised so that the minimum insertion / max. height line can be seen.
The front brake cable is routed through a hole in the front of the stem on some MTB bikes.
Adjusting the height
on this type of stem
means you will
need to re-adjust
the front brake.
Check that the
suspension is intact
and operating
properly on bicycles
equipped with a
suspension type
handlebar stem.
Stem bolt
Handlebar Binder Bolt
Maximum Height/
Minimum Insertion Mark
Expander Bolt Wedge
MTB Handlebar Stem
Stem bolt
Handlebar Clamp Bolts
Maximum Height/
Minimum Insertion Mark
Expander Bolt Wedge
BMX Handlebar Stem
Stem Bolt
Head Set
Head Tube
Maximum Height/
Minimum Insertion Mark
Expander Bolt
Wedge
BMX Handlebar Assembly