3.14 drivetrain

Front Derailleur Setup (Mechanical)

Front Derailleur Setup (Mechanical). Step-by-step procedure for bike maintenance — tools, time, and what to watch out for.

Difficulty ★★☆ moderate
Time ~20 min
Applies to Bikes with front derailleur (mostly older Road, some Gravel, older MTB)
Front derailleur height and rotation alignment

Tools

  • 5mm hex
  • Phillips screwdriver (or hex for newer designs)
  • cable cutter

Procedure

  1. Mount position:

    - Loosen the FD clamp bolt. - Position the outer cage so it sits **1–3 mm above** the tallest tooth of the largest chainring at its closest point. - Rotate the FD so the outer cage is **parallel to the chainring** (look from above — the cage edge should match the chainring's edge, not point inward or outward). - Tighten the clamp bolt to spec (5–7 Nm typical).

  2. Set the low limit (L screw):

    - Shift to the small chainring and largest cassette cog. - Disconnect the cable if connected. - Turn the L screw until the inner cage is **0.5 mm from the chain** (a hair's gap, no rub).

  3. Connect and tension the cable:

    - With the shifter in its lowest position (small chainring), pull the cable taut through the pinch bolt. - Tighten the pinch bolt to spec (typically 5 Nm).

  4. Set the high limit (H screw):

    - Shift up to the large chainring and smallest cassette cog. - Turn the H screw until the outer cage is **0.5 mm from the chain** with no rub.

  5. Test all gear combinations.

    Some chain rub is unavoidable in cross-chain combos (small-small, large-large) on 2x setups; minor fine-tuning with the trim function on the shifter handles the rest. ---

Procedure #

  1. Mount position:
    • Loosen the FD clamp bolt.
    • Position the outer cage so it sits 1–3 mm above the tallest tooth of the largest chainring at its closest point.
    • Rotate the FD so the outer cage is parallel to the chainring (look from above — the cage edge should match the chainring’s edge, not point inward or outward).
    • Tighten the clamp bolt to spec (5–7 Nm typical).
  2. Set the low limit (L screw):
    • Shift to the small chainring and largest cassette cog.
    • Disconnect the cable if connected.
    • Turn the L screw until the inner cage is 0.5 mm from the chain (a hair’s gap, no rub).
  3. Connect and tension the cable:
    • With the shifter in its lowest position (small chainring), pull the cable taut through the pinch bolt.
    • Tighten the pinch bolt to spec (typically 5 Nm).
  4. Set the high limit (H screw):
    • Shift up to the large chainring and smallest cassette cog.
    • Turn the H screw until the outer cage is 0.5 mm from the chain with no rub.
  5. Test all gear combinations. Some chain rub is unavoidable in cross-chain combos (small-small, large-large) on 2x setups; minor fine-tuning with the trim function on the shifter handles the rest.