4. Maintenance & Adjustment
1. Gear Adjustment
Adjust the rear derailleur cable tension to align
guide pulley with the centre of the cogs (setting this
in gear 3 or 4 is easiest). Low adjustment: In 1st
gear check and if necessary, turn the L adjustment
screw so that the guide pulley moves to a position
directly in line with the largest (1st gear) sprocket.
High adjustment: turn the crank arm while gear
shifting the derailleur to move the derailleur to the
top gear position, and then check and if necessary,
turn the H adjustment screw to adjust so that the
guide pulley is in line with the outer line of the
smallest sprocket when looking from the rear.
Turn the crank arm to set the derailleur to the low
position.
H adjustment screw
L adjustment screw
Sonic user manual.indd 10 9/4/2017 3:50:56 PM
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