seeker333

I do not recall the differences between the various SD models, and they appear to be discontinued, as SRAM/Avid website lists only disc brakes now. I do recall that I once bought SD5s to save a few bucks and returned them, so stick with SD7 (if you can find them). Nearly 20 years ago these were offered with titanium hardware and/or magnesium arms, they were pretty fancy for V brakes.

SD7s made between 2014 to apparently end-of-production in 2017 were subject to recall, avoid these.