How To Install A Bicycle Pedal
Posted in Tools, How To, Repair Tips, Mechanical Hints, Pedal Wrenches, Daily Rant on November 28th, 2007It’s time to install some pedals on a bike. If you are in possession of a pedal wrench and some bike grease, you are ready to tackle the pedal installation. No need to run to the local bike shop.
In order to understand what you’re about to read, you’ll need a quick lesson in pedal and bike anatomy. First thing first, whenever referring to right or left on a bicycle, it’s as if you were sitting on the saddle of the bicycle with your hands on the handlebar. Therefore the right side of the bike generally has the drivetrain( derailleurs, gears, and chain). I say “generally” because there are some exceptions. Disc brake calipers are typically mounted to the left side of a bicycle. You get the idea. The center of the bike is a plane that would split the rider, tires, and frame, perpendicular to the ground.
The pedals thread into the right and left crank arms. The large threaded part of the pedal is the pedal spindle, some times called a pedal axle. The part of the pedal that contacts your foot is the pedal body. The pedal body spins on the spindle with the help of bushings or bearings, and a bit of grease. The pedal spindle will have the wrench surfaces that dictate what type of wrench you should use.
The proper pedal wrench is dependent on the pedals on the bike, and more specifically what the pedal spindle has been designed to be compatible with. The most common pedal wrench is probably the 15mm open ended wrench which works on pedals that have wrench flats on the spindle, between the crank arm and the pedal body. There are also pedals that use a similar 9/16″ wrench. The 9/16″ and the 15mm are close in size and appearance and care should be taken to use the proper wrench, especially if your pedal wrench offers both. If the pedal is designed to be used with a hex pedal wrench, the hex socket is found at the end of the spindle, on the inside of the crank arm. These hex sockets on the pedals will be either 6mm or 8mm. Whichever style wrench the pedal is designed to accept, be sure to use a wrench designed specifically for pedals! It will make life easier.
Before you begin the installation, place the bicycle in a stable position. A bike repair stand is best, but leaning it against a wall or flipping it upside down will do just fine. Next, clean the threads on the cranks and the pedals. Once the surfaces are clean you can apply a small amount of bicycle grease to the pedal threads. The grease will help combat corrosion, noise, and seizing, making the pedal’s removal easier later.
Pedals are left and right specific and deciding which is which can be accomplished through a few ways. If there are an L(for left) and an R(for right) stamped into the pedal spindle consider yourself lucky and move on to the next step. Sometimes just one pedal will be stamped with the distinguishing L or R, so check both. If a pedal has a toe clip, is one sided, or is a directional pedal, there is only one direction the pedals can be mounted and remain functional. Hold the pedals up to the bicycle to figure out which is right and left. You can grab your cycling shoes to check how the shoe attaches to the pedal in a clipless pedal and shoe system if you aren’t sure. If none of those work for your situation, hold the pedal up in front of you. Hold the pedal by the pedal body with the spindle pointing threaded end up. The threads on the spindle will appear to have a high and a low side. If the threads run up and to the left, it’s the left pedal. If the threads run up and to the right, it’s the right pedal. Holding both pedals next to each other can make picking up the slight slope of the threads easier on your eyes.
Getting the pedal threads started can be the toughest challenge of the whole process. Sometimes it’s so challenging I will go back to check if I am trying to install the correct side pedal. Double checking is always good too. You’ll want to use your finger to get the pedal started into the crank. By using your fingers you have more control and a better feel in order to get the threads started. Cross threading is a term for what occurs when you thread something in crooked. It is very bad in the world of pedals and cranks. Finger starting the pedals doesn’t allow you enough force on the pedal to mis form the metal threads.
To install the right pedal hold the pedal spindle perpendicular to the right crank so that it lines up with the threaded hole in the crank. Turning the pedal spindle to the right, or clockwise, while holding it in the proper position will start the pedal threads. Use one hand to hold the pedal body to stabilize while the other hand turns the pedal spindle. Got that? To the right. Install the right pedal by turning the spindle to the right(clockwise).
To install the left pedal use the same two handed technique as with the right. The only difference is the left pedal has a left thread, or reverse thread. That means you’ll have to install the left pedal by turning the pedal spindle to the left(counter clockwise). This is opposite of what we are used to as our standard threads are righty tighty. Left pedal, left thread. Left pedal, left thread. Left pedal, left thread.
A couple more thoughts on pedal installation. If you can’t get a pedal started and you are positive it’s the correct side, you may need to re tap the thread to clean them. Threads can easily be damaged. Most shops will have pedal taps and the job is usually quick and easy. About your pedal wrench, it is designed with a long handle for making pedal removal easier if the pedal has been overtightened. The long handle is not to overtighten the pedals. You do not want them to come loose, but you’ll probably want to get them off some day. If you aren’t sure what the proper torque for your pedals are, check with a professional mechanic for some help. Good luck.
