Originally Posted by
Metacortex
I have a low-mile original unrestored 1983 Schwinn Continental (built on Wed. April 20th 1983) that has Dia-Compe 610/750 calipers with Schwinn Approved sticker branding dated 01-83 and 02-82 respectively, both of which have intact Delrin sheathed studs. I believe the guide pin/slot existed on the DC center-pull calipers from 1977 until the present. I can see part of the stud in the 3rd pic in this listing of what seems to be a current production caliper:
Genuine Dia-Compe DC750 Centre Pull Caliper Freestyle Silver - Old School BMX | eBay
Wow you have eagle eyes on that eBay ad. Just think how long this original engineering investment has held out for Dia Compe. Talk about a great return on their original engineering investment. Not so sure it was as great for the engineers though
Thanks for the additional insight into the modern (or newer) versions.