The Wilwood 160-7103-BK is the right-hand SRP drilled-and-slotted version of the Rotor-UL32 line, a vented iron rotor measuring 12.19 x 0.81 inches with an 8 x 7.00 inch bolt circle. Wilwood lists the 160-7103-BK as an SRP Drilled & Slotted rotor with a black electro-coat finish, paired with the left-hand 160-7104-BK. Compared with a plain-face or stock-diameter rotor, the 12.19-inch diameter and drilled-and-slotted face give you more swept area and a cleaner pad surface for repeated hard stops, which is why this part suits autocross, track days, and sport-driven street cars. Because the rotor is cast iron rather than an aluminum hat-mount design, it trades some weight for heat tolerance on sustained braking. Wilwood's install sheets for its two-piece rotors call for a hat and a bolt pattern match before you bolt anything down, so check hub compatibility first. Search terms that fit this part include 12.19 drilled rotor 8x7 right hand, Wilwood SRP R/H iron rotor, and 32 vane UL32 rotor.
The manufacturer lists 160-7103-BK as the right-hand rotor. The left-hand counterpart is 160-7104-BK, so confirm which side you need before ordering a pair.
Yes. The manufacturer's bedding steps call for a sequence of light, then firm, then hard decelerations to transfer pad material evenly onto the rotor face. The manufacturer says these steps should only be performed on a race track or other safe location.
This is a two-piece rotor, so it mounts to a hat rather than directly to the hub. Per the manufacturer's install sheets for its two-piece rotors, the hat must sit squarely against the hub face and the rotor must sit flush against the flange, because poor seating can cause excessive runout. The same sheets call for red thread locker on the rotor-to-hat bolts, tightened in an alternating sequence. Wilwood's install sheets also call for a minimum of 0.080 inch clearance between the wheel and caliper, so check that before final assembly. Expect a shop-level install with a torque wrench, a 12-point socket, and a bleed-capable brake system. Finish by bedding the pads and rotors using the manufacturer's steps. Give the pads and rotors a proper track session rather than doing this on public roads.
