The Wilwood 160-0277 is a 12.19 x 0.810 inch vented iron rotor from the brand's UL32 line, built with 32 straight vanes for airflow. Wilwood's technical support describes 160-0277 as a 12.19" x 0.81" straight vaned rotor, and the 160-0277 is the standard UL rotor. The 8 x 7.00 inch bolt circle is the pattern you need for this diameter, and it matches the hat-mount design Wilwood uses for the rotor family.
Its main advantage is price against the heavier version. The 160-5843 shares the same 12.19 x 0.81 inch envelope, and the 160-5843 is dimensionally the same, but is more heavy duty, offering better endurance and drivability. Choosing the 160-0277 means accepting less endurance margin in exchange for a lighter, lower-cost casting. That trade makes sense for sprint, late-model, or sport-driving use, and it is a weaker choice for sustained high-heat track work. Because it is a hat-mount rotor, fitment depends on the hat, bracket, and caliper you run, so confirm those parts before ordering. Search terms: 12.19 x .810 UL32 vented iron rotor, 8x7 hat mount brake rotor, Ultralite 32 straight vane rotor, 160-0277 vs 160-5843.
Owners on user forums report that Wilwood's technical support said both rotors share the same 12.19 x 0.81 inch dimensions. The 160-0277 is the standard UL rotor, and the 160-5843 is the heavier-duty version with better endurance. Confirm the choice with the manufacturer for your application.
No. The manufacturer's install sheets show the rotor bolting to a separate hat, and the hat then mounts to the axle or spindle flange. The hat must sit flush against the flange, or excessive rotor runout may result.
Installation is a moderate job for a home mechanic with a torque wrench and the correct hat. Per the manufacturer's install sheets, you attach the rotor to the hat with bolts, apply red Loctite 271 to the threads, and tighten in an alternating sequence. Bolts should be safety wired, and install sheets show 0.032 inch stainless wire. Torque values differ between Wilwood kit sheets, so check the sheet for your specific hat and kit. Wilwood's kit instructions also call for at least .080 inch of clearance between the wheel and caliper in all areas. Check runout after assembly, because a rotor that is not flush against the flange will show it.
