what thread size is used on bike pedal
1 Most pedals have 9/16 x 20 tpi threads. 2  Pedals for one-piece cranks are 1/2 x 20 tpi.  Older French bicycles used a 14 mm x 1.25 mm thread, but these are quite rare. French-threaded pedals are commonly labeled D and G (French for droite andgauche (right and left). A French pedal will start to thread into a 9/16 x 20 crank (and vice versa), but will soon bind.