Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
A 0.25-inch rotor opening and red powder-coated body distinguish this Narrow DynaPro configuration. It uses four stainless pistons, internal fluid passages and radial mounting to form a compact hydraulic brake component. The verified material entry for this particular unit is billet aluminum; broad family descriptions should not replace its own specifications. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures disc brake systems and components, from calipers and brake rotors to master cylinders, valves, fittings and brake lines, for motorsport, street-performance and specialized applications; selection depends on the complete brake system.
Technical Details
- Manufacturer part number: 120-17870-RD
- Caliper type: Narrow Dynapro Radial Mount
- Construction: Billet Aluminium
- Finish: Red Powder Coat
- Piston bores: 1.62 / 1.62 inches
- Piston type: Stainless
- Piston count: 4
- Published piston area: 4.12 square inches
- Dust boots: No
- Nominal rotor width: 0.25 inch
- Rotor thickness limits: 0.25–0.25 inches
- Rotor diameter limits: 10.75–12.19 inches
- Mounting style: Radial
- Handedness: Not restricted to one side; correct mounting and bleed orientation required
- Mounting centers: 4.75 inches
- Mounting-hole size: 0.39 inch
- Mount height: 1.61 inch
- Hydraulic inlet thread: M10 x 1.25
- Required pad shape: 7812
- Published pad area: 6.36 square inches
- Published pad volume: 2.1 cubic inches
- Manufacturer-listed component weight: 4.1 lb
Fitment & Compatibility
Start with the rotor’s measured width, then check the mounting height and radial bracket spacing. The permitted rotor diameter envelope is 10.75–12.19 inches, subject to correct pad placement. Ensure that the installed wheel clears both the body and fitting and that the selected pads match the narrow caliper rather than a wider DynaPro version.
PMB Performance brings over 20 years of brake and parts experience to selection questions. Send the existing caliper reference and brake-package details for help checking compatibility.
