Wilwood 120-15565-SI Billet Narrow Dynalite Radial Mount Caliper Side Inlet Anodized

The Wilwood 120-15565-SI is a Billet Narrow Dynalite Radial Mount (BNDLR) four-piston disc brake caliper featuring a side inlet port and a durable anodized finish. Purpose-built for Sprint and Midget inboard racing applications, this caliper delivers exceptional clamping force in a compact, lightweight package weighing just 3.20 pounds.

Engineered with a spacer-less body designed specifically for .38", .810", and 1.00" width rotors, this caliper features a single split bridge area for maximum structural integrity. With 1.62" stainless cup pistons and a 4.75" center radial mount, it can be bolted directly over studs or used with a radial mount bracket kit as a tab-mount caliper replacement.

Key Features:

• Compact, lightweight billet aluminum construction starting at 3.20 lbs
• Four stainless cup pistons deliver strong, consistent clamping force
• Fully CNC-machined billet body with internal fluid ports — no external fluid tubes
• Internal damping springs and controlled retraction in-bore seals for consistent pedal feel
• 3/8" cross bolts for added strength and rigidity
• Two corner bleeds and side (outboard) inlets positioned for standard inboard mounting
• Stainless steel anti-rattle wear plates on bridges reduce wear and eliminate pad rattle
• Center bridge bolt for added caliper strength and positive top-loaded pad retention
• Mil-Spec Type III aluminum-oxide ceramic hard-anodized finish resists bore wear and surface abrasion
• 4.75" center radial mount — direct stud mount or compatible with radial mount bracket kits
• Compatible with 7816-style brake pads in multiple Wilwood PolyMatrix compounds

The BNDLR caliper accepts 0.63" thick 7816-style brake pads, available in a wide range of PolyMatrix compounds to match brake torque and heat range requirements for any high-performance or competition environment. Radial mount bracket kits are available separately for Sprint, Midget Inboard, and Dirt Late Model applications.