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Wilwood 120-13839 Forged Dynalite Internal Caliper, 1.38/.81 Inch
Wilwood 120-13839 Forged Dynalite Internal Caliper, 1.38/.81 Inch

Wilwood 120-13839 Forged Dynalite Internal Caliper, 1.38/.81 Inch

Universal Fit, Four Caliper Pistons, 0.81" Rotor Thickness, Type III Anodized, 1.38" Bore Size

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Wilwood 120-13839 Forged Dynalite Internal Caliper, 1.38/.81 Inch
Wilwood 120-13839 Forged Dynalite Internal Caliper, 1.38/.81 Inch
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We estimate this item will ship on or before January 23rd.
Part # 83512013839
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 3 business days for Wilwood to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


Caliper Pistons:
Rotor Thickness:
Type III Anodized
MFG. Part #:
Bore Size:
Sold in Quantity:
Rotor Diameter:
13.06 Inch
Caliper Finish:


The Forged Billet Dynalite Internal is the next generation enhancement of the venerable Forged Dynalite series calipers. Designed with a single split bridge and spacer less design to enhance strength and appearance. These latest applied developments and innovations in caliper design and manufacturing processes have resulted in substantial improvements in strength and performance over all comparable models. This new spacer-less design of the Forged Dynalite series of calipers, makes this the stiffest and most visual pleasing design so far.

The Forged Billet Dynalite Internal is the strongest caliper in the class, with weights starting at 3.00 pounds. The process of stress-flow forging re-aligns the metal's grain structure within the contour of the caliper body. This process eliminates the breaks and interruptions to the internal grain structure that occur when machining a straight block billet. The FEA generated radial transition design eliminates steps and shoulders in the area between the piston housing body and the caliper bridges. Structural deflection and volume displacement tests have proven the Forged Dynalite to outperform all existing styles of this popular caliper size.

*Note-Pads are not included.

  • Rotor Width: 0.81"
  • Piston Bore: 1.38"



Driving Environment / Application Duty

  • Street Rods                (Heavy Duty)
  • Street Performance    (Heavy Duty)
  • Rally                           (Medium Duty)
  • Road Race                  (Medium Duty)
  • Late Model Dirt           (Heavy Duty)
  • Drag Racing               (Heavy Duty)
  • Northeast Modified     (Medium Duty)
  • Open Wheel               (Medium Duty)
  • Off Road                     (Medium Duty)
Some parts are not legal for use in California or other states with similar laws/regulations

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