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Comprehensive Guide to Rear Derailleur Adjustment and Repair

This guide provides detailed instructions on adjusting and repairing rear derailleurs for bicycles. Learn about cable adjustment, limit screw methods, hanger alignment, cable/housing replacement, and fine-tuning techniques. Ensure your derailleur is in optimal working condition with this comprehensive resource.

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Comprehensive Guide to Rear Derailleur Adjustment and Repair

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  1. Bicycle Mechanics and Repair DecalPhysics 98/198spring 2014Rear Derailleurs meow

  2. Components Shifter Cable Rear Derailleur

  3. Three Limit Screws

  4. Adjustment Methods • Adjust in quarter turns. • Turning B-screw clockwise increases tension, pushing the guide pulley further from the sprocket. • Adjust the H-screw (high limit) when the derailleur is at the smallest (outermost) sprocket. • Adjust the L-screw when the derailleur is at the largest (innermost) sprocket.

  5. Guide is too far. Need to turn B-Screw Counter-Clockwise

  6. Guide is too close. Need to turn B-Screw Clockwise

  7. Correct distance between guide and sprockets.

  8. Cable Barrel Adjuster • Look at derailleur and sprockets from the back. • The chain should be aligned with each sprocket as you shift through the gears. • If the derailleur is pushing too hard towards the wheel, turn the barrel adjuster clockwise until the chain is aligned.

  9. Aligned Derailleur (Smallest Sprocket).

  10. Derailleur Hanger The hanger allows the derailleur to be attached to the frame Replaceable Hanger Will sacrifice itself in an accident to keep the frame unharmed. Non-Replaceable Hanger Requires special attention and care. A broken hanger is often beyond repair.

  11. Repairing a Bent Hanger • If your hanger can be replaced, replace it. • Bend the hanger back with a wrench for leverage. Be aware, it may still break. Bent Hanger Repair Option 1 Repair Option 2

  12. Aligning the Derailleur Hanger • The hunger must be parallel to the rear wheel • If the hanger is straight, but the derailleur looks bent, replace the derailleur. Resources: http://www.utahmountainbiking.com/fix/rhanger.htm http://www.parktool.com/blog/repair-help/rear-derailleur-hanger-alignment

  13. Aligning the Derailleur Hanger Thread in bolt Measure distance(green) to wheel as you rotate the angle gauge Bend using wrench until distance is the same everywhere Resources: http://www.utahmountainbiking.com/fix/rhanger.htm http://www.parktool.com/blog/repair-help/rear-derailleur-hanger-alignment

  14. Or use the DAG

  15. Pointers on Replacing Cable/Housing • Shift to gear with lowest cable tension. Usually: • Take note of how the cable is mounted before removing it

  16. Pointers on Replacing Cable/Housing • Use the old housing to determine the length of the new one. Cut to just the right length. • Cut housing with the correct tool. Make sure the newly-cut edges are not sharp. Too Long Correct

  17. Fine Adjustment • A properly tuned derailleur will shift between all front gears and not throw the chain off the chainrings. • Even a well-adjusted derailleur may rub in some gear combinations Counterclockwise = screws adjuster out = increases cable tension = Moves derailleur outward Clockwise = screws adjuster in = loosens cable tension = Moves derailleur inward

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