Wilwood 120-17202 Forged XRS4R Radial Mount 4-Piston Brake Caliper Hard Anodized

The Wilwood Forged XRS4R is a high-performance radial mount 4-piston brake caliper engineered as a direct-fit upgrade for Wilwood's Forged Billet Narrow Superlite 4-piston radial mounting pattern. Designed for demanding street and track applications, the XRS4R delivers exceptional stopping power with a refined, modern design.

Key Features:

• Forged Aluminum Construction: Advanced FEA-optimized design combined with precision CNC machining produces a stronger, lighter, and more rigid caliper body
• X-Bridge Architecture: Innovative X-bridge design improves structural rigidity and enhances airflow for better caliper cooling under sustained braking
• 4-Piston Radial Mount: Radial mounting configuration for precise caliper alignment and maximum brake feel
• Piston Bore: 1.25 in. x 1.10 in. dual opposing piston bores for balanced and progressive clamping force
• Rotor Compatibility: Designed for use with 1.10 in. wide rotors
• Hard Anodized Finish: Durable hard anodize treatment applied inside and out for corrosion resistance and long service life
• Lightweight Design: At just 4.5 lbs, the XRS4R minimizes unsprung weight for improved handling and responsiveness
• Direct-Fit Upgrade: Compatible with existing Wilwood Narrow Superlite 4-piston radial mount brake systems for a seamless bolt-on installation

Built on decades of street and race-proven Superlite Radial Mount engineering, the XRS4R is the next evolution in Wilwood's high-performance street caliper lineup. Whether upgrading an existing Wilwood system or building a custom brake package, the XRS4R offers a factory-quality fit with measurable performance improvements.