Wilwood 160-5865 Ultralite 32 Vane Drilled Vented Iron Rotor, 12.19 In
Rear Position, Round Rotor Shape, 12.19 Inch Rotor Diameter, Vented Rotor Type, Iron, Plain
- Rotating and unsprung rotor mass reduced by 12%
- Follows close tolerances on face and vane thickness
- Rotor is cast from premium grade, long grain carbon iron
- A two row, 64 hole pattern - alternates between and directly over each vane
- The 32 straight vane casting provides superior heat management and long service life
When it comes to brake rotors, racers are constantly searching for the ultimate balance between the lowest weight and the ability to effectively manage heat. Decreased rotating weight in the drive line provides quicker deceleration under braking and quicker acceleration out of the corners. Lower weight also benefits handling with improved spring and shock control over the unsprung suspension mass. Wilwoods ULD-32 drilled iron rotors provides effective lightweight options for sprints, late models, modifieds, and other competition applications that race in low to medium temperature ranges.
- Cast from premium grade, long grain carbon iron
- Close tolerances on face and vane thickness
- 32 straight vane casting provides superior heat management and long service life
- Two row, 64 hole pattern - alternates between and directly over each vane
- Each hole deeply chamfered to eliminate stress points
- Rotating and unsprung rotor mass reduced by 12%
- Left or right hand mounting locations
Item Details0.81" x 12.19"
8 x 7.00" B.C.
Caution on Drilled Rotors
There is a common mis-perception that rotors are drilled to improve cooling. The reduced mass of a drilled rotor will dissipate its retained heat quicker, but it also builds up heat a much faster rate. The decision to use drilled rotors should be solely based on the merits of the lower rotating and unsprung weight, and NOT for improved cooling. It is NOT wise to use drilled rotors in sustained high heat on hard braking tracks unless the team budget affords a high frequency of rotor and brake pad replacement.
- Race drilled rotors are unsafe for street use
- Suitable applications: Light to moderate Dirt Racing
Proper Break-In Procedure for Steel or Cast Iron Rotors
New steel/iron rotors should be bedded in before being used in racing conditions. Proper bedding will prepare the rotor surface, prolong the rotor's life, and make it more resistant to thermal checking or cracking under severe braking conditions. The following procedures should be performed when bedding in both steel and cast iron rotors. It is best to bed in a new rotor using a used set of pads, preferably ones which will not create heat rapidly. Generating heat too rapidly will thermal shock the rotors. Likewise, when bedding in a new set of brake pads it is best to perform the process on a used rotor. This new/used bedding process permits controlled bedding of each individual component.
Make sure rotor surfaces are free from oils, grease, and brake fluid. Run vehicle up to a moderate speed and make several medium deceleration stops to heat up the rotor slowly. This will help reduce the chance of thermal shock caused by uneven heating of the rotor. Pull into the pits and allow the rotor to cool to ambient air temperature. Care should be taken not to ride the brakes into the pits as this may hot spot the rotor causing premature wear to the surface or structural damage.
- Vented iron
- Inboard mounted (Sprints)
- Thickness: 0.81"
- O.D.: 12.19"
- Bolt Circle: 8 x 7"
- Threads: Thru
- Weight: 8.6 lbs
- Face: drilled
- Rotor Mount Hole Size: .326"
- Lug ID / Registration: 6.38"
- Far Side Inside Diameter: 8.56"
- Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
More Like This
Speedway Pro-Lite Vented Brake Rotor, 12.19 x .81 Inch
Wilwood 160-0277 Ultralite 32 Vane Vented Iron Rotor, 12.19 x .810 In.
Wilwood 160-8136 Ultralite 32 Vane Vented Scalloped Iron Rotor, 12.19
Wilwood 160-13498 HD 48 Curved Vane Spec-37 LH Iron Rotor, 11.75"
Wilwood 160-11862 Ultralite HP 32 Vane Vented Iron Rotor, 12.19 x 1.10
Wilwood 160-12206 Ultralite HPS 32 Vane GTS Vented Iron Rotor, 12.19
Wilwood 160-5843 Ultralite HP 32 Vane Vented Iron Rotor, 12.19 x .810
Wilwood 160-2900 Ultralite 32 Curved Vane Vented RH Iron Rotor, 12.19
Wilwood 160-11840 GT 48 Curved Vane Spec 37 Iron Rotor, 12.19 Inch
Wilwood 160-12288 GT 36 Curved Vane Spec 37 Iron Rotor, 12 Inch
Q & A
We get a lot of questions about brake kits so Tim gives a brief overview of disc brake setups.
Learn how to bed in or burnish your brake pads. Our quick guide and video will teach you the proper procedure to get the best performance out of your brakes.
Learn how to assemble one of our bolt on nine-inch Ford disc brake kits in this step-by-step guide.
Tim talks about the options we have for early Ford drum brakes.
We offer a guide to follow when selecting a new set of brake pads for your race car. It's important to know the friction quality and pad size before selecting a new set of racing pads.
Jeff installs a Wilwood 12.19" Front Disc Brake Kit to his 1967 Chevelle. Read more on the caliper bracket assembly and brake rotor setup.
A guide on how to install Wilwood rear brakes for performance and better handling suspension. Learn about critical clearance for the outer axle components on Jeff's 1967 Chevelle.