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How to adjust Front&Rear Derailleur by yourself?

Follow These Instructions:

Things You'll Need

• Bike Lube
• Bike Chains
• Bike Chain Cleaning Brushes
• All-purpose Bike Tools
• Bike Chain Tool

1. Adjust the Front Derailleur

   • 1
     Hang the bicycle from a hook or bungee cord, suspended so the pedals and wheels can rotate freely, or use a repair stand if you have one.
   • 2
     Find the front derailleur: Starting with the left shift lever, follow the cable until it enters a mechanism near the front gears. This is the front derailleur.
   • 3
     Locate the derailleur adjusting screws,which are two small adjacent screws on top of the mechanism. One should be labeled "L" for low gear; the other should be marked "H" for high gear.
   • 4
     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 labeled "L" by one turn.
   • 5
     Loosen the "L" screw an additional turn if you still can't shift. If the chain comes off, tighten the "L" screw.
   • 6
     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. If the chain goes too far and comes off, tighten the "H" screw.
   • 7
     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.
   • 8
     Fine-tune your adjustment as necessary.

   Adjust the Rear Derailleur

   • 1
     Find the rear derailleur: Starting with the right shift lever, follow the cable to the pulley mechanism near the back gears.
   • 2
     Look for two screws. As with the front derailleur, there is one screw for Low and one for High.
   • 3
     Turn the pedals forward and shift into your smallest cog. If the chain doesn't shift into the smallest cog, loosen the "H" screw. If it overshoots the small cog, tighten the screw.
   • 4
     Shift into the largest rear cog. Again, if it doesn't shift, loosen the "L" screw. If it goes too far, tighten the screw.

Tips & Warnings

• You can follow the same steps for a triple crank set. However, if you have Rapidfire or STI shifting, you may need to take the additional step of fine-tuning your cable tension. Generally, when the chain is on the small chain ring, the front derailleur cable should have a small amount of slack - it shouldn't be completely taught.
• Once the limits are set, you may need to fine-tune the index shifting. See "How to Fine-Tune a Bike's Rear Index Shifting."
• Pay particular attention when adjusting the "L" limit on the rear derailleur. If you don't set this limit properly and shift past the largest cog at speed, you can cut off the drive-side spokes and your wheel could collapse.
• Be careful of fast-spinning wheels as you work. Getting yourself caught in the spokes hurts; be mindful of fingers and tools.

How to Adjust Gears on a Mountain Bike

Adjusting the gears on your mountain bike is a relatively easy exercise that can not only make your rides more enjoyable, but also save you money since you will be doing your own tune-ups rather than having a bike shop do it. There are basically three different places you can adjust the shifting of your bicycle and this article discusses each one.

Instructions

Things You'll Need

• Screwdriver
• Allen wrenches
• Needle-nosed pliers

1. • 1
     Find the "barrel adjuster" on your shifting mechanism (for the purpose of this article, the type of shifters does not matter. This information applies to both front and rear shifters). The barrel adjuster is a screw affixed to your shifters that loosens or tightens your shifter cable.
   • 2
     Loosen the barrel adjuster if you are having a hard time shifting to a lower gear. If you are having a hard time shifting up to a higher gear, tighten the barrel adjuster. Get your bike shifting as well as you can by using trial and error, then move on to the next step.
   • 3
     Find the barrel adjuster on your derailleur. Again, loosen the adjuster to shift down easier and tighten it to shift up easier. Again, using trial and error adjust your shifting until it is as good as possible. Using the barrel adjusters is the main way to adjust your gears.
   • 4
     Use the small adjustment screws located on the top of the derailleur to fine-tune any small glitches that may still be arising when you change gears. The screws will be labeled "Hi" and "Low." The "Hi" screw will help you shift up to a higher gear, and the "Low" screw will help you drop to a lower gear. Using the barrel adjusters and adjustment screws in unison is the only way to achieve a fully tuned mountain bike gear set.

Tips & Warnings

• Be patient. Becoming good at tuning your own gears takes time and practice.