Joined: Sep 2020
Posts: 838
Likes: 1,633
From: Sacramento, CA
Bikes: 2017 Sage Skyline, 2015 Co-Motion Periscope Tandem, 2006 Kona Jake, 1978 Richard Sachs, 1977 Peugeot PRN10, 1974 Allegro Schweitzermeister Model 76, 1972 Hugo Rickert Spezial, 1971 Fuji Finest
Is it possible they are French threaded?
Remember that if the crankarms are French threaded, putting an English threaded pedal on won’t work. Don’t know if this is the issue. Also, you can buy fairly inexpensive 9/16 pedal tap kits on Amazon or EBay to repair threading if it is just damaged. Worse case scenario is a larger diameter tap and the use of a helicoil to restore standard diameter threading.