That's what is weird. I was sent the stoptech spec sheet for sizing of the backing plates and mine measured correctly. (and remember, my old stoptechs no longer fit the newer pads either). Carbotech did tell me they buy backing plates 100's at a time so it's possible they've been using the same batch for a long while. However that doesn't support others having the same problem (K. Lydic is running Performance Friction and having the same problem).
Bookmarks