Attachment of the pedals to the cranks.
Pedals are screwed to the cranks.
The left pedal is being put with left-hand thread to prevent the pedal to get loose when cycling.
When you disassembly and assembly a pedal, you must take this into account because some pedals can get stuck.
It is smart to disassembly and assembly them with a special pedal wrench (Figure 16).
This wrench has greater leverage than a normal wrench.
If a pedal has a left or right-hand thread (Figure 17) shows the shape of the thread. Left-hand thread indicates when the thread is looking to the left.
In addition, it is usually indicated on the pedal if it is a left or right pedal.
When pedals have left hand thread a mark is put on the axle, L (from Left), G (from gauche, French for Left) or S (for sinistra, Italian for left).
When pedals have right-hand thread state an R (from right) or D (from droit, French for right or D (from destra, Italian for the right).
The most commonly used thread is BSC 9/16 “x 20 TPI. French pedals can have M14 x 1.25 as thread.
When mounting the thread must be clean and lightly smeared with grease.