Wilwood Dynapro-ST Front Road Race Brake Kit for Mazda MX-5 Miata (2016–2023) and Fiat 124 Spider (2017), Dynamic 11.75-Inch GT Rotors

MX-5 Miata and 124 Spider front race brakes use dynamic GT rotors and BP-35 pads. Confirm wheel fit; extended cold use accelerates pad and rotor wear. The conversion combines the caliper, pad and rotor configuration specified for this axle and mounting arrangement. Wilwood Engineering designs and manufactures disc brake systems from its base in Camarillo, California. Bill Wood founded the company in 1977. Its range of calipers, brake rotors, master cylinders, valves, fittings and brake lines serves motorsport, street-performance and specialized applications; each part must suit the requirements of the complete braking system.

Technical Details

• Hydraulic inlet thread: 1/8-27 NPT
• Brake-rotor package: 11.75 × 0.81 inches; Spec-37 Iron; GT Slotted
• Wheel-diameter reference: 15 in; the complete wheel-clearance drawing determines fit
• Retained-axle rotor mounting pattern: 4 x 3.93 inches; this does not change the retained hub or axle wheel pattern
• Flexline supply: Included; confirm correct routing and hard-line connection
• Installation hardware: Included; verify the installed fastener engagement
• Items not supplied: spindles, wheel hubs, master cylinder, brake booster
• Wilwood part number: 140-17938
• Conversion type: front conversion kit; Sold as a kit.
• Intended use: Road Race kits contain high temperature racing pads. Extended low temperature use will cause premature rotor and pad wear.
• Caliper configuration: Dynapro Lug Mount-ST; 4 pistons per caliper; Type III Anodize
• Bracket-to-caliper mounting: Lug
• Pad compound selection: BP-35
• Caliper piston specification: Thermlock

Fitment & Compatibility

Applies to the listed 2016–2023 Mazda MX-5 Miata trims, with RF coverage beginning in 2017, and the 2017 Fiat 124 Spider Classica and Lusso entries. GS, GT, GX and RF derivatives retain their individual year limits in the table below. Confirm the installed front brake package, retained hub, 4 × 100 mm nominal mounting arrangement and full wheel profile; the 4 × 3.93-inch catalog drilling is the rotor/hat interface. Follow DS-1622 for caliper centering and supplied hose routing. This road race package uses high-temperature BP-35 pads; prolonged low-temperature operation can cause premature pad and rotor wear. It is not a general street-pad selection.

Wilwood product specifications · Wilwood installation and compatibility information · Wilwood installation and compatibility information

PMB Performance brings over 20 years of parts and fitment experience to component selection. Share the VIN, original brake package, axle position and wheel-clearance measurements so we can help check the configuration before ordering.

Manufacturer warning — brake pads only: WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov.