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.
Stem Bolt
Head Set | Maximum Height/ |
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| Minimum Insertion Mark |
| Expander Bolt |
| Wedge |
| Head Tube |
BMX Handlebar Assembly
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
Check that the suspension is intact and operating properly on bicycles equipped with a suspension type handlebar stem.
Handlebar Clamp Bolts
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Stem bolt |
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| Minimum Insertion Mark |
Expander Bolt Wedge |
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| Expander Bolt Wedge | ||
MTB Handlebar Stem |
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| BMX Handlebar Stem | ||
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Updated 23/05/07 | RAOM0507 | Apollo Bicycle Company Pty. Ltd. ABN: 60 001 914 469 |