This will probably be the shortest guide on this page. Which doesn't mean it's the least important. Replacing pedals on a bike isn't complicated, but I understand that most people don't do it every day. So, the instructions are perfectly relevant. Unusually for the cycling world, there are virtually no exceptions – only very, very old or "extremely Chinese" bikes can have two identical threads. Personally, I've never encountered such a situation. I'll discuss both the procedure itself and a few things to keep in mind along the way. Let's get to the point!
How to replace pedals on a bicycle?
First of all, you need the right tool – one is enough. Most models are a standard 15mm open-end wrench. Some models, especially the higher-end models, also have (or only – check) a socket for a 6mm or 8mm Allen key. This reduces the risk of damaging the crank with a wrench and reduces the buildup of grime around the bearings. Be sure to also stock up on some grease. Anti-seize grease is best, but a standard ŁT-43 or other universal grease will also do the job. The most convenient way to put your bike on a stand is to put it on, but if you're reading this, you probably don't have one. In that case, I recommend doing it on its wheels, with the bike leaning against a wall or held by a second person. Stability and the ability to apply significant force are key. The most effective, though not very comfortable, position is to stand behind the bike and rest your chest on the saddle.
Replacing pedals is not a delicate task.
Remember one thing – the right and left pedals have different threads. You don't want to ruin your crank, do you? It's easy to remember. The left pedal has a left-hand thread, the right pedal a right-hand thread. How can you tell which pedal is which? The letter L or R is always stamped somewhere on the visible part of the axle. Simple! Before loosening the chain, place it on the largest chainring . This writer forgot this sometime ago and still has a scar on his wrist from a Campagnolo crank tooth with a seized pedal.
Replacing bicycle pedals begins by loosening them on both sides. To do this, place the wrench in place, aiming away from the pedal axis and toward the center of the crank. Simultaneously, grasp the crank or pedal on the opposite side with your other hand. This creates good leverage and utilizes the strength of both arms and back muscles. Pull with one hand, push with the other. This usually requires considerable effort, even the use of old-fashioned incantations. The thread often comes loose suddenly, so watch out for the teeth. Once loosened, don't continue unscrewing, but proceed in the same way with the other side. Without the pedal, it's harder to grip the crank, and the lack of weight causes it to rotate upwards. With the other pedal, everything is the same, only the loosening direction will be reversed. Literally, in a mirror image.
If you can't unscrew the pedal, there's one simple solution: a larger lever. Find a longer wrench or make an extension. You can also use your feet. Stand with one foot on the opposite side of the pedal and the other on the wrench. However, you do this at your own risk. ;) If that doesn't help, I recommend going to the nearest repair shop. It'll be easier and faster than struggling at home.
Once you've done that, unscrew the pedals completely and clean the threads in the cranks, preferably with a degreaser (e.g. brake cleaner, white spirit).
How to attach pedals to a bicycle?
Similarly. First, thoroughly lubricate the threads of new pedals. This is extremely important, because without it, they tend to seize, and that's a real bummer. With some cranks (especially carbon) and pedals, you also need to add washers under the pedals. Tightening is made easier because you can quickly do it by turning the crank backwards while holding the axle. Then, just tighten it all the way. How tight? With a standard open-end wrench, "face-colored." How much force in bar. If you have a really large lever, tighten it firmly, but don't overdo it. Around 30-35 Nm is optimal.
That's it! Now you know how to replace your bike's pedals! No more philosophy!
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