Sheldon Brown wrote:
Shimano SLR calipers use nylon or Teflon pads that the spring bumps
against, which generally don't reqire wet lubrication.

I used DuraAce 7402 (the last single pivot DuraAce) with those pads
and they went off center when dirty...


These are the finest single-pivot calipers ever made. I've got

....while my SunTour GPX single pivot with two internal springs stay
centered, regardless of dirt. YMMV, mine does.

--
MfG/Best regards
helmut springer