Shimano's Dura-Ace rear derailleur features a pair of crucial settings, including range of motion and cable tension. While the range of motion will be set by the factory, and should not change over time, cable tension will alter with use. The derailleur relies on the cable to pivot back and forth, and the action of pivoting causes the cable to stretch. Lacking proper cable tension, the derailleur becomes less precise in its ability to shift the chain to a selected cog. Adjusting the cable restores the derailleur's ability to perform this task.
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Use the small rear gear shifter paddle on the handlebar and push it in toward the bike as many times as it will go.
Lift the back of the bike and use the pedals to rotate the crank forward. The Dura-Ace rear derailleur will now shift the chain onto the smallest sprocket.
Locate the derailleur cable tension adjuster. On a Dura-Ace rear derailleur, the tension adjuster can be found where the cable and derailleur meet. The adjuster is plastic and grey in colour.
Turn the adjuster in toward the bike, adding tension to the derailleur cable. Begin with a quarter-turn.
Take the bike for a short ride and use the rear gear shifter to shift gears. The increased cable tension will enhance the Dura-Ace rear derailleur's ability to shift the chain to the larger gears.
Adjust the cable further if needed. Each time, hop off the bike, give the adjuster a quarter-turn, and take the bike for a short ride to check the adjustment. Properly adjusted, the Dura-Ace rear derailleur will respond precisely to the order to shift.
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