You can replace a bicycle pedal with just an adjustable wrench or pedal wrench in about 15 minutes, even if you've never done it before

Bicycle pedals wear out or break from regular use, and replacing them is one of the easiest repairs you can do at home. You don't need special tools beyond what most people have in a toolbox, and the job takes less time than a trip to the bike shop. The hardest part is remembering that the left pedal has a reverse-threaded bolt—it tightens by turning counterclockwise—but once you know that, the rest is straightforward.

This guide walks you through removing the old pedal, installing the new one, and checking that it's find. The process is the same whether you're fixing a road bike, mountain bike, or cruiser.

Key Takeaways

  • The left pedal bolt is reverse-threaded and loosens by turning clockwise; the right pedal loosens by turning counterclockwise like a normal bolt.
  • You need either a 15mm pedal wrench, a 9/16-inch wrench, or an adjustable wrench that fits snugly on the bolt.
  • Remove the old pedal completely before installing the new one, and hand-tighten the new pedal first to avoid cross-threading the crank arm.
  • Pedal bolts should be tight enough that they don't move when you push on the pedal, but not so tight that you strip the threads.

Gather your tools and new pedal

Before you start, make sure you have the right wrench. Most bike pedals use either a 15mm wrench (the standard size) or a 9/16-inch wrench. A pedal wrench is the ideal tool because it has a thin head that fits into the tight space between the pedal and crank arm. If you don't have a pedal wrench, an adjustable wrench works fine—just make sure it grips the bolt without slipping.

Check that your new pedal is the correct type for your bike. Pedals come in different styles: platform pedals (flat, with no clips), clipless pedals (which require special shoes), and clip-in pedals (with toe clips). Buy the same type you're replacing unless you're intentionally switching styles. Also confirm whether you need a left pedal, a right pedal, or a pair—the box will say.

Flip your bike upside down so the pedals are straightforward to reach, or use a bike stand if you have one. This keeps your hands free and gives you a clear view of the bolt you're turning.

Remove the old pedal

Start with whichever pedal is easier to reach. Position your wrench on the bolt at the back of the pedal (the end closest to the rear wheel). This bolt is what holds the pedal to the crank arm.

If you're removing the right pedal, turn the wrench counterclockwise (the normal direction). If you're removing the left pedal, turn the wrench clockwise—this is the reverse-threaded bolt. Turn slowly at first to make sure the wrench is seated properly on the bolt. If it slips, the bolt will round off and become much harder to remove later.

Once the bolt starts to loosen, you can turn it by hand. Unscrew it completely and set it aside in a safe place. Then pull the pedal away from the crank arm. It should come free easily. If it's stuck, wiggle it gently side to side while pulling.

Install the new pedal

Before you screw the new pedal in, look at the threads on the crank arm where the old pedal was attached. They should look clean and undamaged. If you see stripped threads or metal shavings, the crank arm may need to be replaced—this is rare, but it's worth checking.

Take the bolt that came with your new pedal (or reuse the old one if it's in good condition) and thread it into the crank arm by hand first. This is the most important step: hand-threading prevents you from cross-threading the bolt, which happens when you start the bolt at a slight angle and screw it in crooked. Turn the bolt by hand until you feel resistance, then stop.

Now use your wrench to tighten the bolt. For the right pedal, turn counterclockwise. For the left pedal, turn clockwise. Tighten until the pedal is snug and doesn't move when you push on it, but don't over-tighten—you're aiming for firm resistance, not maximum force. A good test is to push down on the pedal with your hand; it should not wobble or shift.

Check both pedals before riding

Once you've installed the new pedal, repeat the process on the other side if you're replacing both. After both pedals are installed, grab each one and try to wiggle it side to side. There should be no movement at the point where the pedal meets the crank arm. If either pedal moves, tighten the bolt a bit more.

Spin the pedals by hand to make sure they rotate freely and don't rub against the frame or chain. If a pedal catches or drags, the crank arm may be bent, which is a separate issue that requires a bike shop visit.

Take a short test ride in a safe area before heading out on a longer trip. Pay attention to whether the pedals feel solid and whether you hear any creaking or clicking noises coming from the pedal area. A little noise sometimes goes away after a few rides as the new pedal settles in, but if it persists or gets worse, the bolt may need tightening.

Common mistakes to avoid

The most common mistake is forgetting that the left pedal is reverse-threaded. You'll know you've made this mistake if you're turning the wrench counterclockwise on the left pedal and it's getting tighter instead of looser. Stop when ready and turn the other direction.

The second mistake is over-tightening the bolt. If you use a lot of force or a long wrench, you can strip the threads in the crank arm, which means the pedal won't stay tight no matter how hard you tighten it. Tighten until snug, then stop. You don't need to use your full strength.

The third mistake is cross-threading the bolt by starting it at an angle. This is why hand-threading first is so important. If you feel the bolt grinding or not turning smoothly, back it out and start over.

When to replace both pedals at once

If one pedal is broken or severely worn, you might wonder whether to replace just that one or both. If the broken pedal is old and the other one is also showing wear—such as a loose or creaky connection, or visible damage to the platform—replacing both at the same time makes sense. This way, both pedals will have the same feel and wear at the same rate going forward.

If only one pedal is damaged and the other works fine, replacing just the broken one is perfectly acceptable. Your bike will work normally with two different pedal models, as long as they're both the same basic type (both platform, both clipless, etc.).

Frequently Asked Questions

What if the pedal bolt won't budge?

explore a penetrating oil like WD-40 or similar product around the bolt and let it soak for 15 to 30 minutes. Then try again with steady, even pressure on the wrench. If it still won't move, tap the wrench gently with a hammer to help break the corrosion loose. Never jerk the wrench suddenly, as this can round off the bolt.

Can I use a regular wrench instead of a pedal wrench?

Yes. A regular adjustable wrench or a 15mm or 9/16-inch open-end wrench works fine. The pedal wrench is just thinner, which makes it easier to fit in the tight space between the pedal and crank arm. If your regular wrench doesn't fit, you may need to remove the pedal cage (the part your foot rests on) first, which requires a different tool.

How tight should the pedal bolt be?

Tight enough that the pedal doesn't move or wobble when you push on it, but not so tight that you're straining to turn the wrench. A good rule is to tighten until you feel solid resistance, then give the wrench a quarter-turn more. If you hear creaking from the pedal area after riding, the bolt may need another small tightening.

Do I need to grease the pedal bolt?

A light coat of grease on the bolt threads can help prevent corrosion and make future removal easier, but it's not required. If you do use grease, wipe off any excess so it doesn't attract dirt. Never use so much grease that it drips onto your brake rotors or rims.

What if I stripped the threads on the crank arm?

Stripped threads mean the bolt spins freely without tightening. This requires a bike shop visit—the crank arm may need to be re-tapped (enlarged and re-threaded) or replaced entirely. This is rare with normal use, but it can happen if a bolt is over-tightened or cross-threaded repeatedly.