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Updated 23/05/07RAOM0507 Apollo Bicycle Company Pty. Ltd. ABN: 60 001 914 469
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Adjustment – Front Derailleur
The front derailleur is positioned correctly when its chain guides are parallel to the
chainrings and there is approximately 2mm-4mm of clearance between the outer chain
guide and the large chainring. To achieve this ideal derailleur positioning, loosen the
clamp bolt and make the necessary adjustments. To adjust the clamp position lower
for top mounted cable systems, disconnect the derailleur cable.
To adjust low gear on front derailleurs:
- Shift the chain onto the smallest front
chainring and the largest rear sprocket.
- Loosen off the control cable fixing bolt.
- Turn the adjusting screw marked ‘L’ until
the inner cage clears the chain.
- With the shift lever fully in the low
position, pull the control cable taut.
- Re-tighten the cable fixing bolt.
To adjust high gear on front derailleurs:
- Shift the gears until the chain moves to the smallest rear sprocket.
- Turn the adjusting screw marked ‘H’ until the chain moves to the largest chainring.
- Turn the ‘H’ adjusting screw further until the inside of the out cage of the derailleur
just clears the chain.
For triple systems, altering the cable tension adjuster on the shifter levers enables the
positioning to be fine tuned to a lower or higher location. Increasing tension moves the
derailleur to a higher position and lessening the tension moves it to a lower position.
After making any adjustments it is important to test the gears in all possible front and rear
chain positions. If the chain rubs against the cage when on the inner or outer chainring,
in any rear sprocket position then turn the appropriate adjusting screw anti-clockwise.
If the chain falls off either the inner or outer chainring, turn the appropriate adjusting screw
clockwise. If the chain will not shift onto either the inner or outer chairing, turn
the appropriate adjusting screw anti-clockwise.
To fine tune the front derailleur on MTB bicycles fitted with front SIS:
- Shift the chain to the largest rear sprocket and the largest front chainring.
- Shift from the largest to the middle chainring.
- Turn the cable adjusting barrel (located in the shifter), so that the inner chainguide
just clears the chain.
- Test that the chain shifts cleanly, without hesitation between each chainring.
Cable Clamp Bolt
Low Adjusting Screw
High Adjusting Screw
Chainguide Clearance
Outer Chainguide
Inner Chainguide
1-3mm