The Spoke Curriculum - Session 3: Difference between revisions

'''Rear H-Limit'''

# Shift chain to outermost (largest) chainring (front). Shift chain to outermost rear sprocket (smallest sprocket).

# Check tension on rear cable. If cable appears to have any tension, it may interfere with the H-screw setting. Turn adjusting-barrel clockwise to eliminate cable tension, or release the cable entirely. Proper cable tension (indexing) will be adjusted later.

'''Rear L-Limit'''

The L-limit stops the derailleur from moving inward (toward the spokes). The limit screw does not make the derailleur move, pulling the inner wire makes the derailleur move. The L-screw allows the pulley wheels to shift the chain to the innermost sprocket and yet not shift off the sprocket into the spokes.

# Shift bike to middle chainring (or smaller ring of double chainring bikes) and to second-to-innermost rear sprocket.

# Pedal bike at a quick cadence.

'''B-Screw Adjustment'''

If the pulley rubs against the innermost rear cog, tighten the screw on the back of the derailleur to pull the pulley back and away from the cog.

'''Rear Indexing'''

Note: If the cable is not correctly routed into the derailleur pinch bolt, a good indexing setting may not be possible. The wire should leave the barrel adjuster and travel straight to the pinch mechanism.

'''Front Derailleur Height and Rotational Angle'''

Usually, the bottom of the front derailleur's outer cage plate should clear the outer chainring by 1-2mm (about the thickness of a penny). The outer cage plate should also be parallel to the chainring. Some times both of these adjustments need to be modified to get good shifting.

'''Front indexing'''

# Shift chain to middle chainring in the front, and innermost (largest) rear sprocket.

# Gap between the inner cage plate and the chain should be as small as possible without rubbing the chain.