What gears do and when to shift them
A gear bicycle has multiple chainrings (the large sprockets near the pedals) and cogs (the smaller sprockets on the rear wheel). When you shift, you move the chain between these sprockets to make pedaling easier or harder. Lower gears make the pedals turn more easily but move you forward more slowly; higher gears make pedaling harder but cover more ground with each rotation.
Shift to a lower gear when you need to climb a hill, start from a stop, or pedal slowly through traffic. Shift to a higher gear when you are on flat ground, moving downhill, or want to go faster. The goal is to keep your legs spinning at a comfortable rhythm—roughly 80 to 100 pedal rotations per minute—rather than grinding hard or spinning too fast.
Most bicycles have shifters on the handlebars: either twist-grip shifters (which you rotate like a motorcycle throttle), trigger shifters (which you press with your thumb or fingers), or bar-end shifters (which sit at the ends of drop bars). The right shifter controls the rear gears; the left shifter controls the front chainrings. Familiarize yourself with which direction moves to an easier gear on your specific shifter before you ride.
Key Takeaways
- Shift before you need to, not after—move to an easier gear as you approach a hill, not when you are already struggling.
- Keep your legs spinning at a steady rhythm by shifting often; grinding hard on one gear wears out your knees and chain.
- The right shifter controls rear gears (fine adjustments); the left shifter controls front chainrings (big jumps in effort).
- Always pedal gently while shifting, and avoid shifting the front chainring and rear cogs at the same time.
- If the chain skips or makes noise after shifting, stop and check that the derailleur (the mechanism that moves the chain) is aligned with the cog or chainring.
How to shift the rear gears smoothly
The rear shifter makes small, precise changes. Use it for most of your riding. Press or twist the shifter in the direction marked "easier" or with a minus sign to move to a lower gear (smaller cog, easier pedaling). Press or twist in the direction marked "harder" or with a plus sign to move to a higher gear (larger cog, harder pedaling).
Shift only while you are pedaling—the chain needs to be moving to climb onto the next cog. Pedal gently as you shift; if you are pushing hard, the chain may not move cleanly and you could damage the derailleur. Make one shift at a time and wait a half-second for the chain to settle before shifting again. If you need to drop several gears quickly (for example, approaching a steep hill), shift one gear at a time rather than jumping all the way down.
If the chain hesitates, makes a grinding noise, or skips after you shift, stop pedaling briefly and check that the rear derailleur (the small arm hanging below the rear cog) is aligned directly under the cog you just shifted to. If it looks crooked or the chain is rubbing on the derailleur cage, the derailleur may need adjustment—this is a job for a bike shop.
How to shift the front chainrings
The front shifter makes larger changes in effort. Use it less often than the rear shifter, mostly when you need a big jump—for example, shifting from a steep hill to flat ground, or from a stop to cruising speed. Shift to a smaller chainring (easier pedaling) when climbing or starting; shift to a larger chainring (harder pedaling) on flat ground or downhill.
Like the rear shifter, press or twist gently while pedaling. The chain needs momentum to climb onto the next chainring. Pedal smoothly and avoid shifting the front and rear at the same time—the chain can jam or fall off if you do. After shifting the front, you may hear the chain rub slightly on the derailleur cage for a moment; this is normal and stops once the chain fully settles.
If the chain falls off the chainrings entirely, stop and pick it back up by hand. Wipe your hands on your pants or a rag, then check that the front derailleur (the cage around the chainrings) is not bent. If it looks straight but the chain keeps falling off, the derailleur limit screws may need adjustment—take the bike to a shop rather than forcing it.
Starting from a stop on a gear bicycle
Before you start, shift to a low gear—usually the smallest chainring in front and a middle-sized cog in back. This makes it easier to push off without the bike lurching or stalling. If you are not sure which gear you are in, shift the rear shifter all the way down (easier direction) and the front shifter all the way down (easier direction) to start in the lowest gear.
Straddle the bike with one foot on the ground. Push off with your grounded foot while pressing down on the pedal with your other leg. Once you have momentum, sit on the saddle and pedal smoothly. As you speed up and feel comfortable, shift to a higher gear. Do not try to accelerate hard in a low gear—you will spin the pedals too fast and waste energy. Shift up gradually as you pick up speed.
If the bike feels sluggish or the pedals are hard to turn when you start, you may be in too high a gear. Stop, shift down, and try again. It is better to shift too low and spin fast than to strain and risk losing balance.
Stopping and braking on a gear bicycle
Brake gently and evenly by squeezing both brake levers (usually on the handlebars) at the same time. Squeeze the rear brake lever slightly harder than the front to avoid flipping over the handlebars. Brake in a straight line if possible, and avoid braking hard while turning—the wheels can slip.
As you slow down, shift to a lower gear so you are ready to accelerate again or start from a stop. If you come to a complete stop in a high gear, you will have to strain to start moving again. Shift down before you stop, or shift down while you are still rolling slowly. This is especially important on hills or in traffic where you may need to move quickly.
If your brakes feel spongy, make a squealing noise, or do not stop the bike smoothly, do not ride the bike until they are checked. Brake problems are a safety issue and need attention from a bike shop.
Common shifting mistakes and how to avoid them
The most common mistake is waiting too long to shift. Riders often try to pedal hard in a high gear up a hill, then shift down when their legs are already burning. Shift before you need to—as soon as you feel the pedals getting hard, move to an easier gear. Your legs will thank you and you will ride faster overall.
Another mistake is shifting while coasting (not pedaling). The chain needs to be moving to shift cleanly. If you coast and then try to shift, the chain may not move to the next cog, or it may make a grinding noise. Always pedal gently while shifting.
Shifting the front and rear chainrings at the same time can cause the chain to jam or fall off. Make one shift, wait for the chain to settle, then make the next shift if you need to. This takes only a second or two and prevents damage.
Finally, do not ignore chain noise or skipping. These are signs that something is misaligned or worn. A small problem now becomes expensive later, so have the bike checked if something sounds or feels wrong.
Frequently Asked Questions
What gear should I use on flat ground?
On flat ground, use a middle or higher gear—usually the larger chainring in front and a smaller cog in back. Start in a middle gear and shift up as you speed up. The exact gear depends on your speed and how hard you want to pedal; aim for a rhythm where your legs spin smoothly without grinding.
Why does my chain make noise after I shift?
A noisy chain usually means the derailleur is not quite aligned with the cog or chainring you just shifted to. Stop and check that the derailleur arm is pointing straight at the cog. If it looks crooked or the chain is rubbing, the derailleur may be bent or out of adjustment—take the bike to a shop.
Can I shift while going downhill?
Yes, but shift gently and only while pedaling. Downhill, you may want to shift to a higher gear to keep up with the bike's speed, or to a lower gear if you want to pedal and control your speed. Avoid braking hard and shifting at the same time, as this can cause the chain to jam.
What if the chain falls off?
Stop the bike, straddle it, and pick the chain up by hand. Wipe your hands, then check that the front and rear derailleurs look straight and are aligned with the chainrings and cogs. If the chain keeps falling off after you put it back on, the bike needs a shop visit—do not force it.
How do I know if I am in the right gear?
You are in the right gear if your legs spin at a steady, comfortable rhythm—roughly 80 to 100 rotations per minute—without grinding hard or spinning too fast. If the pedals feel heavy, shift to an easier gear. If you are spinning so fast your legs feel out of control, shift to a harder gear.