ehh. they are 26mm so a little more than an inch. Are old bikes actually an inch or slighty over? Are they standard or metric? I am not a huge bike person.
Bicycles use either a 1" (25.4mm) or 1-1/8" (28.575mm) headset. I was able to easily fit a Puch Maxi fork on a beach cruiser with a 25.4mm headset. The cups and bearings are nearly identical, but the threaded race and top nut aren't interchangeable.
Awesome video. I bought 2 sets , and was wondering how east it was going to be to retro fit my old Puchs! Question Where did you source that headlight?