We bought these pads to replace worn PBR ULTs (similar to Axxis pads, 109.04350, Ultimate brake pads. Axxis/PBR pads were a favorite Some of North America's most knowledgeable brake gurus have long made the choice for high-performance road use: StopTech's Tim Kelsch, Zeckhausen Racing's Dave Zeckhausen and UUC Motorwerks' Rob Levinson; but Axxis and PBR seem to be making their cuts in ULT sales North America these days and the braking gurus have basically switched to StopTech Street Performance