How Do You Adjust Bicycle Gears?

Answer

Starting with the left shift lever, follow the cable until it enters a mechanism near the front gears. One should be labelled L for low gear and the other should be marked H for high gear. Turn the pedals forward and shift into the small chain ring. If the chain does not move into the small chain ring crisply, loosen the adjusting screw labelled L by one turn. Loosen the L screw an additional turn if you still can't shift. Shift into the big chain ring once you have set the inner limit. Shift the rear derailleur. The chain should not rub the front derailleur when you're in the big ring in front and in the small cog in back. Likewise, it shouldn't rub when you're in the small ring in front and the big cog in back.
1 Additional Answer
Ensure that the bicycle is in a stationary position then find the front derailleur starting with the left gear lever, follow the cable until it enters a mechanism near the front gears. Locate the derailleur adjusting screws, which are two small adjacent screws on top of the mechanism, ask someone to assist you by holding the rear wheel of the cycle off of the ground, Loosen the L screw an additional turn if you still cannot shift. Shift into the big chain ring once you have set the inner limit. If the chain does not go into the big chain ring, loosen the H screw. Shift the rear derailleur. Finally fine-tune your adjustment as necessary.
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