Originally Posted by jitteringjr

Still there are only like three standards of pedal threads 9/16x 20tpi is the most common one. There is an old one piece American crank with a smaller diameter at 1/2” and there is a old and rather rare French standard that uses a also smaller than 9/16 diameter of 14mm. Someone would have had to drill the cranks out and put in a larger spindle of which I am not sure was ever made. There was an old larger shimano style that tried to put the pedal bearing inside the crank arm but I can’t imagine this making its way to your much newer bike. What pedals are too small for this?

https://www.sheldonbrown.com/pedals.html