There will come a point when you would have to replace your stock pedals. If you do find a better pair of pedals, there is no reason for you not to install them on your bike.
1. Look for the large bolt that connects the foot of the pedal to the crank arm. There’s joint between these two parts; right in the middle is the bolt. Like any other bolt, this particular connection is threaded, so you will need a big enough wrench to loosen the bolt.
2. It’s time to loosen the bolt that connects the foot of the pedal and the crank arm. When you are working on the right side of the bike, the bolt will loosen when you turn the wrench to the left (opposite direction).
It’s a different story when you are working on the left side of the bike. You see, the pedals of a bike are designed to be in a constant state of tightening.
So, whenever you pedal your bike, the continuous rolling motion ensures that any loosening bolts will be tightened naturally. When you are loosening the pedal on the left side of the bike, you need to turn the wrench to the right in order to loosen it. If you turn the wrench to the left, you will end up tightening it.
As a safety precaution, shift your gears so that the derailleurs will transfer the chain to the gear teeth that are closest to the pedals. This way, you won’t end up with extremely painful cuts if something goes amiss and the back of your hand ends up flying toward the chainring.
3. Once you are able to successfully loosen the bolt that connects the pedal to the crank arm, apply a bit of machine oil to the groove at the tip of the crank arm. This will prepare the crank arm for the new attachment.
4. When the grooves of your crank arms are ready, get your new pedal and screw it on by hand. Leave your wrench for now; the precise movement of your hands is best at this point in time.
Make sure that the pedal goes in perfectly, so you do not inadvertently damage the threading of the crank arm. Once the new pedal is in place, feel free to tighten the bolt once again with your wrench.
Be very careful when installing new pedals, as you can easily damage the grooves of the crank arm without noticing it. Metal forced against another metal surface almost always results in physical damage.