Schwinn Speedster Schwinn Owner's Manual - Page 59
Coaster Brake Hub, Derailleur Systems
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Brake arm clip Brake arm Spocket Lubrication 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 left to a specialist. Apply oil to the freewheel whenever you lubricate the chain, taking care to wipe off any excess. Coaster Brake Hub Many BMX style and other children's bicycles are fitted with a coaster hub brake in the rear wheel. This type of brake offers the advantages of reliability and easy operation. 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 attention as far as lubrication, adjustment or replacement of internal parts; if needed, this should be left to a specialist. Keep the coaster hub sprocket clean and oil it along with the chain. Make sure the brake arm is correctly attached to the chainstay with the brake arm clip. The brake will not operate otherwise. (Fig. 4.14) 4.14 MAINTENANCE Pre-stretch the derailleur cables to remove slack Stretch Derailleur Systems The derailleur system includes the front and rear derailleurs, the shift levers, and the derailleur control cables, all of which must function correctly for smooth gear shifting to occur. There are several different types of derailleur systems but all operate using similar principles. For the rear shifter, there will be a positive "click" for each gear. When properly adjusted, one click should change one gear at a time. For the front shifter (if equipped) some shifters are a "friction" system, where you move the shifter until the desired shift occurs. Others have the same audible "click" to indicate that one gear has been changed. The adjustments are similar. Inspection The operation of the derailleur system should be checked at least every month. Check the operation of the rear derailleur first, then the front. The rear derailleur should shift the chain cleanly from one cog to the next without hesitation. Each notched position in the shifter must equate to a new gear position. After shifting, the rear derailleur should not rub on the chain. The derailleur should never cause the chain to fall off the inner or outer freewheel cogs. 4.15 ©2010 59