XRZ4R Radial Mount Caliper – Part No: 120-16462
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XRZ4R Radial Mount
Prod #: 120-16462
Price: $863.94
XRZ4R Radial Mount - Product Summary
Caliper No: 120-16462
XRZ4R Radial Mount

Piston Count 4
Piston Area (in²) 5.18
Piston Type Thermlock
Dust Boot No
Rotor Dimensions
Rotor Width (in) 0.81
Rotor Diameter(in) 14.00
Pad Dimensions
Pad Area (in²) 8.2
Pad Volume (in³) 4.9
Duty Rating & Material
Material Forged Aluminium
Weight(Lbs) 5.2
Colors & Finish
Color Anodize
Finish Type III Anodize

Mount Center(in) 5.98
Mount Position
Mount Side Right Hand
Mount Type Radial
UPC Number
UPC 889545101508
Product Documents
Product Data Sheet

Click To Download
Installation Instructions

WARNING: Cancer and Reproductive Harm
Applicable to Brake Pads Only

120-16462 - Product Description

XRZ4R Radial Mount

Wilwood’s next-generation XRZero race calipers combine decades of race experience, computer finite element analysis (FEA), and state-of-the-art machining into a race caliper that is lighter and stiffer, with zero drag. The unique shape of the high surface area body creates a caliper with superior brake fluid cooling and allows more airflow through the rotor. Optimized profile high-temperature seals provide better piston retraction resulting in less drag. The unique center X-bridge strengthens the caliper body without adding mass or obstructing airflow to the brake rotor or pads. Computer FEA design and precision CNC machining of the stress-flow forged aluminum body results in a caliper weighing just 4.66 pounds - 1/2 pound less than a comparable sized Wilwood Superlite caliper.

The innovative complex shape of the body removes unnecessary bulk, improves brake and fluid cooling, and actually decreases deflection. Four Thermlock® thermal barrier pistons reduce heat transfer to the brake fluid, and the staggered bore size front calipers provide more even engagement with improved pad wear. Hard-anodized inside the piston bores and on the surface with Type III aluminum-oxide ceramic finish for durability and equipped with single-point bleed technology and low-profile bleed screws for easy serviceability. No-bind pad retaining pins (spare included) hold your choice of multiple 0.80” thick Wilwood race compound brake pads for extended service life.

Product Specifications

Rotor Compatibility
Rotor Width (in) 0.81
Maximum Rotor Width (in) 0.90
Minimum Rotor Width (in) 0.75
Maximum Rotor Diameter(in) 14.00
Minimum Rotor Diameter(in) 11.75

Brake Pad Specifications
Brake Pad Type 1 10420
Brake Pad Type 2 N-A
Brake Pad Type 3 N-A
Total Pad Area (in²) 8.2
Total Pad Volume (in³) 4.9
Piston Specifications
Piston 1 Bore (in) 1.88
Piston 2 Bore (in) 1.75
Piston 3 Bore (in)
Total Piston Area (in²) 5.18

Mounting Specifications
Mount Type Radial
Mount Side Right Hand
Mount Center(in) 5.98
Mount Hole Size(in) 0.39
Mount Height(in) 1.63
Inlet Thread Size 3/8-24
Pad Dimensions & Part Numbers
Pad Dimensions for the XRZ4R Radial Mount Pad Dimensions for the XRZ4R Radial Mount Zoom Image
Axle Set P/N
Pad Type
Non-Bedded Pads - by Compounds
PolyMatrix H
Mount Dimensions for the XRZ4R Radial Mount Mount Dimensions for the XRZ4R Radial Mount Zoom Image
Mount Dimensions & Part Numbers

Dimensions for the XRZ4R Radial Mount Dimensions for the XRZ4R Radial Mount Zoom Image

Additional Notes

Parts & Accessories

O-Ring Kit 130-2427
Replacement Dust Boot N-A
Replacement Piston 1 200-7550
Replacement Piston 2 200-7551
Replacement Piston 3 N-A
Replacement Piston 4 N-A
Cross-Over O-Ring Kit 130-10540
Bridge Bolt Kit N-A
Wear Plate L/H N-A
Wear Plate R/H N-A
Pad Retainer 180-14649
Bleed Screw Kit 220-0627
Self Bleeder Tube N-A
Cross-Over Tube N-A
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Version: 3.05 June 23, 2023