The Alcon CIR15/AV1 brake pad set in the T16.5mm, RD65.5mm axle configuration is a four-pad kit built for Alcon's CIR15 caliper platform. The AV1 designation identifies the friction formulation, and the shimmed hardware is included with the set. Stock pads are not designed for Alcon big brake calipers, so using this matched set keeps the pad geometry and friction material that Alcon's system was engineered around. Generic aftermarket pads may not seat correctly in CIR15 calipers, which makes a dedicated set the safer choice for a track-focused or heavy-use brake upgrade.
Before ordering, confirm that your vehicle runs an Alcon big brake kit with CIR15 calipers and check whether your rotors are one-piece or two-piece, since Alcon lists different pad part numbers for each rotor design. The shimmed "S" variant is not interchangeable with the non-shimmed PNS4415X504.4 pad, so match the suffix to your hardware. Buyers searching for CIR15 AV1 shimmed axle set pads, Alcon big brake kit replacement pads, or PNS4415X504S.4 should verify fitment with the manufacturer before installation.
