PLEASE NOTE: As of August 1, 2023 our Windsor location will no longer be open for Walk-In Traffic

855.444.6872 Contact Us Mon-Fri 10a-6p & Sat 10a-3p EST

Wilwood Brakes Big Brake Hat - Flared Bell 170-15555

Wilwood Brakes Big Brake Hat - Flared Bell 170-15555
Wilwood Brakes Big Brake Hat - Flared Bell 170-15555
$289.99 ea
NEWARRIVING SOONEstimated Ship Date 10/05/2023 (If Ordered Today)47 available from WILWOOD ENGINEERING as of 09/21/2023
Model: 3924925
Supplier has not provided any fitment data for this product.

GT Series Big Brake Flared Bell hats are precision machined from premium aluminum alloys for high strength and attention to minimized weight. Hats in this category feature threaded rotor mount holes for use with standard through-hole mount rotors. Threaded hole hats may also be used with T-Nuts or bobbins designed for use with specially machined slotted hole dynamic mount rotors. When used in conjunction with matched Wilwood rotor hardware kits, GT hats provide solid, reliable performance in the most demanding conditions.Flared Bell Hats are generally used with rotor mount bolt circles of 8.38" and larger. Offsets range from 1.88" to 3.00" for rotor diameters 12.19" and up.

Additional Notes
Hat is drilled and countersunk in three places to accommodate hat to hub anchoring screws used with specific Wilwood hat mount hubs. Use 230-7032 (contains 6 qty. 1/4-20 x .50 Flat Head Hex Drive mounting screws)

About Wilwood Engineering

Wilwood Engineering designs and manufactures high-performance disc brake systems. Since the company’s inception in 1977 by Bill Wood, we have developed a substantial matrix of brake components and engineering techniques that allow us to quickly and reliably create brake systems for almost any application. Our core ability is the rapid development of custom engineered brake systems using a combination of off-the-shelf and custom components. In addition to designing and manufacturing brakes for all types of competitive motor sports, Wilwood also manufactures brake systems and components for agricultural equipment, industrial applications, utility vehicles, snowmobiles, quads, motorcycles and military vehicles.

With headquarters in Camarillo, California, Wilwood employs approximately 250 people. We have on-shelf stock of more than 300 different brake calipers, 200 rotor designs, 100 master cylinder designs and a wide assortment of brackets, fittings, valves and brake lines. Our off-shelf brake calipers range in size from tiny calipers used on go-carts and light duty industrial equipment, to heavy duty original equipment brakes for the U.S. military Humvee.

Wilwood's engineering department uses the latest computer-aided design and manufacturing techniques in conjunction with finite element analysis, dynamic test and cycle test equipment, to find high-performance and reliability solutions for the most difficult braking tasks. Our extensive inventory of proprietary on-the-shelf components allow us to provide cost-effective solutions for unique brake applications.

Wilwood is ISO 9000 compliant and has extensive experience maintaining quality levels of 100ppm or less for original equipment manufacturers.


Application Info
Application Note 55-57 GM Drop Spindle
Hat Bolt Kit Part # 230-8008
Hat Dimensions
Center Reg. (in) 3.06
Hat Offset (in) 1.100
Mount Hole Type Threaded
Rotor Bolt Circle (in) 12 x 8.75
Additional Hat Dimensions
Clearance I.D. (in) 7.02
Face Thickness (in) 0.25
Hat Stud Diamenter - BC 1 (in) 0.520
Hat Stud Diamenter - BC 2 (in) 0.520
Rotor Mount Hole Size (in) 1/4-20
Hat Type
Finish Black E-Coat
Material Aluminum
Mount Style Fixed Mount
Weight (lbs) 2.200
Bolt Circle Dimensions
Hat Bolt Circle 1 5 X 4.50
Hat Bolt Circle 2 5 X 4.75


Write a Review
* Your Name:
* Email (This will not be displayed)
* Rating:

Ask a question about

Wilwood Brakes Big Brake Hat - Flared Bell 170-15555:
Muscle Cars & Classics 2023