Wilwood 120-3842 Dynalite Single IIIA Caliper, 1.75" Piston, 0.25" Rotor

Vehicle Fitment

• Universal fit -- suitable for custom, UTV, kart, snowmobile, or motorcycle applications

Fitment Notes

• Mounts via 3.75" lug-style bolt pattern
• Covers 6.00"-13.00" rotor diameters (0.18"-0.25" thickness)
• Uses universal hydraulic inlet (3/8"-24 male)

Features

• 2-piston Dynalite Single IIIA design, 1.75" stainless pistons
• Total piston area: 2.40 in² -- excellent for compact, high-performance use
• Cast-aluminum body; Type III anodized finish
• Lightweight -- approx. 1.8 lb caliper weight
• Designed for applications where OEM performance with lightweight compact packaging is needed

Specifications

• Part Number: 120-3842
• Piston Diameter: 1.75" stainless steel (x2)
• Piston Area: 2.40 in²
• Rotor Compatibility: 6"-13" diameter, up to 0.25" thick
• Mount: 3.75" lug-style bolt-on
• Hydraulic Inlet: 3/8"-24 male
• Finish: Type III anodize (gray)
• Weight: ~1.8 lb
• Warranty: Wilwood lifetime structural upgrade warranty

Included Components

• 1x Dynalite Single IIIA Caliper (120-3842)
• Installation instructions

Product Description

The Wilwood 120-3842 Dynalite Single IIIA caliper is a lightweight, high-performance braking solution designed for a broad spectrum of custom applications--street rods, race karts, UTVs, motorcycles, snowmobiles, and more. Its clean lug-mount architecture fits 3.75" bolt patterns with ease onto rotors from 6"-13" in diameter and up to 0.25" thickness.

Featuring two 1.75" stainless steel pistons and 2.40 in² piston area, this caliper provides strong, responsive braking in a compact package. The cast aluminum body is finished with Type III anodize for corrosion resistance, while the stainless pistons reduce heat transfer for consistent performance. At just ~1.8 lbs and supported by Wilwood's lifetime structural warranty, the 120-3842 is ideal where light weight, durability, and braking power matter.