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What is actually the difference between the two? Do they have the same dimensions ie. thickness, mounting holes etc? Also if they fit a standard C4S do they provide a braking improvement?

Many thanks,

Damian

I think the C4S/TT big reds are a larger diameter, better stopping. If you want to upgrade for the track, just throw on some pagid orange pads on yours, hand of god stopping at the track.

Chris

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Any of these options will require wheel hub changes also.

GT3 mk1 (and perhaps others) calipers will require 5 mm spacers so the wheels won't rub the calipers.

C2 and C4 Rotors (steel)

Front: 318 mm

Rear: 299 mm

C2 and C4 Calipers

4 piston

GT3 mk1 Rotors (steel)

Front: 330 mm

Rear: 330 mm

GT3 mk1 Calipers

4 piston

GT3 mk2 Rotors (steel)

Front: 350 mm

Rear: 330 mm

GT3 mk2 Rotors (PCCB)

Front: 350 mm

Rear: 350 mm

GT3 mk2 Calipers

6 piston

TT Rotors (steel)

Front: 330 mm

Rear: 330 mm

TT Rotors (PCCB)

Front: 350 mm

Rear: 350 mm

TT Calipers

4 piston

GT2 Rotors (steel)

Front: 350 mm

Rear: 350 mm

GT2 Rotors (PCCB)

Front: 350 mm

Rear: 350 mm

GT2 Calipers

4 piston

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So to clarify, there is absolutely no difference between the rotors?

Yet there is a different part number and a price premium (in the UK), Porsche GB claim it's a Motorsport part.

I've got Pagid RS29 (Yellow) fitted on my C4S and stopping power is phenomenal :) just have to replace the rotors because of a few little cracks around the holes.

Damian

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Well, the GT3 mk1 front rotor (996 351 409 91) has a Motorsport part number (ends in 91) and the TT front rotor (996 351 409 02)has a regular part number. The specs same the total pad area and the sweep areas are identical also. I do not know if the material (hardness) grades are the same or not. The GT3 was intended for track performance and the TT really wasn't.

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