StopTech AeroRotor (also called "friction ring") attached to aluminum
you can't see it in the photo, the hardware passes through oval slots
in the AeroRotor, rather than circular holes. Since iron and aluminum
expand at different rates, the slots allow the hardware to slide and the
AeroRotor to expand and contract, unconstrained by the aluminum AeroHat. This
reduces stress at high temperatures and
extends component life and improves pedal feel under heavy racing
conditions. Conventional rotors can distort into a
cone shape during race conditions, leading to tapered pad wear, stress
cracks, and spongy pedal feel.
Each new StopTech AeroRotor comes with
a hat mounting kit, consisting of 10 each of the following: 4mm Allen screws, Inconel (Nickel
alloy) Belleville washers
acting as anti-rattle springs, drive pins. Also included is a packet of Loctite 290 thread locking
compound, and an instruction sheet.