Mongoose MULTI SPEED - Coaster Brake Hub; Derailleur Systems

©2011
Lubricaon
Remove any accumulated dirt from the freewheel with a brush and a degreaser. Disassembly
of the freewheel is a complicated procedure requiring special tools, and should be le
to a specialist. Apply oil to the freewheel whenever you lubricate the chain, taking care
to wipe o any excess.
Coaster Brake Hub
Many BMX style and other children’s bicycles are ed with a coaster hub brake in the
rear wheel. This type of brake oers the advantages of reliability and easy operaon. The
brake is operated by applying back pedal pressure and allows the rider to ‘coast’ without
pedaling, if desired. There are several models of coaster hubs available, and the internal
mechanisms are very complex. They require infrequent aenon as far as lubricaon,
adjustment or replacement of internal parts; if needed, this should be le to a specialist.
Keep the coaster hub sprocket clean and oil it along with the chain.
Make sure the brake arm is correctly aached to the chainstay with the brake arm clip.
The brake will not operate otherwise. (Fig. 4.14)
Derailleur Systems
The derailleur system includes the front and rear derailleurs, the shi levers, and the
derailleur control cables, all of which must funcon correctly for smooth gear shiing
to occur. There are several dierent types of derailleur systems but all operate using
similar principles. For the rear shier, there will be a posive “click” for each gear.
When properly adjusted, one click should change one gear at a me. For the front
shier (if equipped) some shiers are a “fricon” system, where you move the shier
unl the desired shi occurs. Others have the same audible “click” to indicate that
one gear has been changed. The adjustments are similar.
Inspecon
The operaon of the derailleur system should be checked at least every month. Check
the operaon of the rear derailleur rst, then the front. The rear derailleur should shi
the chain cleanly from one cog to the next without hesitaon. Each notched posion in
the shier must equate to a new gear posion. Aer shiing, the rear derailleur should
not rub on the chain. The derailleur should never cause the chain to fall o the inner or
outer freewheel cogs.
MAINTENANCE
Brake arm clip
Brake arm
Spocket
4.14
Stretch
Pre-stretch the
derailleur cables
to remove slack
4.15
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