How to Adjust Bike Gears

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If your bike is having a hard time shifting, staying in gear, or the chain is falling off, you will need to adjust your gears. Derailleurs are devices that allow you to change gears, pushing and pulling the chain onto different gears every time you shift. While they may looking daunting, adjusting your bike gears is not difficult if you have patience and a few tricks up your sleeve.

Method 1
Method 1 of 2:

Adjusting your Gears

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  1. You need to be able to spin the wheels freely without the bike moving. The best way to do this is with a bike stand. If you don't have one, check if your local bike shop or outdoor store has a "maintenance night," where you pay a small fee to access to all of their tools for the night.
    • You can also turn the bike upside down, resting it on the seat and handlebars. If you do, however, know that you will have to reverse the direction you spin things in the following instructions.
    • You can also hang the nose of your saddle in the notch of a tree or low hanging joist.
  2. Derailleurs are the machines that physically shift your gears and keep your chain in place. There is one on the back wheel attached to the cassette (the collection of gears) and another smaller derailleur near the pedals. [1] Check that there is nothing in the derailleurs or gears like leaves, sticks, or mud, and clean them with a damp cloth.
    • The rear derailleur is the more complex machine, consisting of the derailleur, an arm, and 1-2 smaller gears that the chain is threaded through. A cable pulls this arm back and forth, allowing the chain to switch gears.
    • The front derailleur is clamped onto your bike's frame, and consists of a spring and two "derailleur plates," or small metal walls that force the chain to stay on only one gear at a time.
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  3. Using one hand to lightly pedal the bike, shift through 1 gear per click, starting with every gear on the back derailleur. Go up every gear once and down every gear once. Note places where the gears have trouble shifting, where the chain slips off the gear, or where you need to shift twice to make the bike shift. [2]
    • While testing one derailleur, put the other one in the middle gear. For example, if I am testing the back derailleur and I have 3 gears in the front, leave the front derailleur in the middle ring the entire time. This prevents the chain from stretching.
  4. Follow the cables leading to the derailleurs to find the adjusters, which look like little nuts or barrels surrounding the cables. There may be two for each cable -- one at the derailleur end and another by the handlebars. These make small adjustments to the derailleur cables, allowing you to make subtle changes to your shifting.
  5. While pedaling the bike with one hand, shift your gears up until you get to a problem, such as if the chain won't shift, has trouble staying on the gear, or skips a gear. Stop shifting when you find an issue, but keep your bike in that gear.
  6. If you have trouble shifting as you lower your gears (lower gears are closer to the wheel), then loosen the cable adjuster by turning it counterclockwise. Turn the adjuster slowly, turning until the chain falls into the correct gear.
    • Always work slowly, adjusting by a quarter-turn at a time at most.
    • Think of it as of turning the adjuster the way you want the chain to move. Rotate towards the bike to make the chain move towards the bike.
    • Don’t loosen the adjuster too far [3] or it may detach from the derailleur. If you need to make a large adjustment, thread the adjust into derailleur, shift into the smallest gear, loosen the pinch bolt, and pull the cable by hand.
  7. If your bike struggles to work it's way up the gears (away from your bike), you should tighten the cable adjuster by turning it clockwise. When it is correct, the chain will naturally switch to the correct gear on its own.
    • Think of this as turning the adjuster the way you want the chain to move. Rotate away from the bike to make the chain move away from the bike.
  8. Once you've successfully adjusted the problems, cycle through every gear again to make sure that the derailleur can successfully shift through every gear.
    • You want the chain to flow smoothly from gear to gear every time you shift.
  9. Sometimes the bike will behave differently under your weight. In a parking lot or driveway, ride the bike around and cycle through any gears. Note any problems and adjust your cables accordingly.
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Method 2
Method 2 of 2:

Fixing a Slipping or Limited Chain

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  1. You need to be able to spin the wheels freely without the bike moving. The best way to do this is with a bike stand. If you don't have one, check if your local bike shop or outdoor store has a "maintenance night," where you pay a small fee to access to all of their tools for the night.
    • You can also turn the bike upside down, resting it on the seat and handlebars. If you do, however, know that you will have to reverse all of the following instructions.
  2. On the rear derailleur, this is the small gear furthest from the bike. On the front derailleur, it is the small gear closest to the bike.
    • Shift the derailleur you are not working on to a gear somewhere in the middle.
  3. This is found at the end of the cable leading from your handlebars to your derailleur. A small bolt clamps the cable in place, holding it tight. Using an Allen key, unscrew the bolt to free the end of the cable.
    • Advanced Note: You'll notice that, if you pedal the bike, the chain will slide down to the lowest ring without your help. That is because derailleurs work by tightening the cable to hold the chain in place. Similarly, you can shift your bike manually by pulling the cable.
  4. [4] In order to prevent your chain from slipping off, the derailleur is contained to the small area between the gears. There are two small screws which hold the derailleur in place, located right next to each other on the top (front derailleur) or back (rear derailleur) of the derailleur.
    • The screw on the left, often labeled with an "H," which limits how high the chain can go and affects the outer gears.
    • The screw on right, often labeled with an "L," limits how low the chain can go and affects the inner gears.
  5. If your chain is falling off near the outer gears of the front derailleur, then tighten the H screw to limit it. When the chain falls off closer to your wheel, then tighten the L screw.
    • Consult with your bike’s manual if the H and L screws aren’t clearly labeled.
  6. If the derailleur pushes too far the chain will fall off the gears and towards the wheel. Alternatively, it may not push far enough, and the chain will not get to all the gears. You can then adjust the limit screws to move the derailleur -- and you will actually see it moving.
    • Tighten the low limit screw if you the chain goes too far. This will keep the derailleur from moving too much to the left.
    • Loosen the low limit screw if you cannot shift into every gear. This will allow the derailleur to move farther in.
  7. With the chain on the smallest gear, tighten or loosen the low limit screw so that the chain doesn't touch the derailleur plate.
    • Shoot for 2-3 millimeters of space on each side of the chain. [5]
  8. Shift back down to the smallest gears and pull the cable tight by hand -- it does not need to be perfect, just taut -- then screw the cable back in place underneath the bolt on the derailleur you removed it from.
    • Often, you can see an indent in the cable indicating where it was bolted before.
  9. Make sure your bike can shift comfortably to and from every gear in the front and back, and use your cable adjusters to make changes where necessary. Only shift 1 gear per click. [6]
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Community Q&A

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  • Question
    I have an old bike it claims to have "10-speed performance," although it only shifts three times is this normal?.
    Community Answer
    Yes. "10 speed performance" implies your three-speed bike performs as well as a 10-speed.
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  • Question
    What should I do if I am stuck in first gear and can't shift up?
    LibArtsPremed18
    Top Answerer
    Many things could be causing that. First you should make sure you are shifting properly. Do not shift while putting a lot of stress on the pedals, especially going up hill. You should only be lightly pedaling when shifting. You should also make sure you are not already in the highest gear and your chain is lubed. Lastly, if the bike still will not shift, you will need to index your shifting or bring it to a mechanic. A bent derailleur hanger, for example, can keep the bike from shifting properly.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
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    Not Helpful 2 Helpful 7
  • Question
    I want my bike to only remain in a high gear. How can I adjust the screws so it stays in my desired gear?
    LibArtsPremed18
    Top Answerer
    Limit screws should not be used to keep a bike in a particular gear. As long as you're not shifting, and your gears are indexed properly, the bike will stay in the gear you set on it's own. If you want to make it impossible to shift below a particular gear ratio, you can change the cassette on your bike to one with a lower range, for which you'll also need to change your chain, or you can block out gears the way junior racers do. You can also convert your bike to single speed with the help of your local bike shop.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
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    Not Helpful 4 Helpful 8
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      Warnings

      • Never "cross-chain" your bike or use gears that force the chain to stretch diagonally from the front to the back. This stresses the chain and can lead to cracking.
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      References

      1. ↑ https://www.youtube.com/watch?v=meUQ-BiFL28
      2. ↑ https://www.youtube.com/watch?v=LeYLXbDqEes
      3. ↑ https://www.sheldonbrown.com/derailer-adjustment.html
      4. ↑ http://www.madegood.org/bikes/repair/set-a-limit-screw-on-a-rear-derailleur/
      5. ↑ https://www.youtube.com/watch?v=ZNG7g83lI-s
      6. ↑ https://www.bikeradar.com/advice/workshop/how-to-adjust-the-gears-on-your-bike/

      About This Article

      Article Summary X

      To adjust your bike gears, put your bike on a bike stand or set it upside-down on its seat and handlebars. Locate the front and rear derailleurs, which are the mechanisms that shift the gears and keep the chain in position. Once you’ve found them, test the gears one at a time while turning one of the pedals on your bike by hand. Note any spots where the gears have trouble shifting so that you can make adjustments there. If you notice that your bike can’t shift down from one gear to another, loosen the derailleur cable adjuster slowly, a quarter-turn at a time, by turning it counterclockwise. If you can’t shift up, slowly tighten the cable adjuster by turning it clockwise. Return to your lowest gear and go through all the gears again to see if the adjustments worked. Then, take a short practice ride on your bike to see if you notice any other problems. To learn how to fix a slipping or limited chain, scroll down!

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