Girodisc Front 350mm 2-piece Rotor Upgrade for Porsche 991 C4S/C2S

SKU: A1-122
HP (whp)
TQ (fr/lbs)
WT (lbs)

Product Details

The Girodisc system is a direct replacement for the OE disc with the
addition of our provided caliper spacers. Our rotor is slightly larger
than the OEM rotor at 350mm versus 340mm providing greater braking force
and cooling capacity. The Girodisc front rotors are approx 21.0 lbs
vs. 24.4 lbs for the stock units. This reduction in rotational and
unsprung weight allows for quicker acceleration and suspension response.

The central hat section of our rotor is made from strictly U.S.
sourced 6061-T6 aircraft specification aluminum. The disc is made from
our own proprietary cast iron, poured in the USA and machined from start
to finish in house at Girodisc. The rotor utilizes a curved vane
design, developed in racing to act as a centrifugal pump to force
cooling air through the disc.

The rotor and hat have a floating mount system, which utilizes 8 or 10
high strength alloy steel drive pins, manufactured by Girodisc in the
USA to our own specifications and cadmium plated for a long lasting
corrosion resistance.
 These pins take the load from braking
actions while maintaining the axial and radial float between the hat and
disc. The pins are secured by grade 12 cap screws with hardened
washers. In order to keep the rotors from making noise when cold, the
pins are mounted with anti-noise spring washers on the rotor side which
allow the rotor to grow with heat expansion but eliminate the rattle and
noise associated with floating rotors. This float also allows the rotor
to self center between the pads.

Once the Girodisc system is in place, simply replace the cast iron rotor
when needed.