How to Adjust a Front Derailleur on a Shimano C050
The CO50 front derailleur is part of Shimano's Tourney line of bicycle components. The front derailleur is responsible for shifting the chain to each of the bicycle's front sprockets, or "gears". Adjustment of the derailleur is required if the chain struggles to shift to one or more of the gears. Accurate adjustment of the front derailleur ensures that the derailleur shifts efficiently and accurately.
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Instructions
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Shift the bicycle into the smallest front gear. Then shift the bicycle into the smallest rear gear. The particular combination of the two gears positions the chain closest to the inside of the bicycle.
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Note the two screws atop the Shimano CO50 front derailleur. The screw farthest from the bike controls the derailleur's low range. The screw closest to the bike controls the derailleur's high range. The range determines how far in either direction the derailleur is able to pivot.
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Use a Phillips screwdriver and turn the low-range screw until the side of the derailleur is approximately 0.5 mm from the side of the chain.
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Shift the bicycle into the largest front gear. Then shift the bicycle into the largest rear gear. The particular combination of the two gears positions the chain farthest from the inside of the bicycle.
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Use the Phillips screwdriver and turn the high-range screw until the side of the Shimano CO50 derailleur is 0.5 mm from the side of the chain. To check the clearance, grab the derailleur cable and pull the cable taught -- note the gap between the derailleur and the chain.
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Shift the bicycle into the intermediate front gear.
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Note the cable adjusting bolt, where the Shimano CO50 cable enters the gear shifter. Turn the cable adjusting bolt until there is a gap of 0.5 mm between the inside of the derailleur and the chain. A counterclockwise turn decreases the gap. A clockwise turn increases the gap.
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References
- Photo Credit Polka Dot Images/Polka Dot/Getty Images
