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718 S GTS GiroDisc Rotor Install - Review

16285 Views 46 Replies 16 Participants Last post by  don
Just thought I'd post my experience/review of the Girodisc Rotors for 718 S/GTS models.

Firstly, the larger GiroDisc are not any lighter than OEM but with the alloy hats the weights come out very similar so there is not really any weight penalisation. If you want to go lighter carbon ceramics seem to be the only option.

I used our regular bathroom scales so not the most accurate but you get an idea:

OEM Front 330mm Rotor 9.7kg, GiroDisc 350mm Front Rotor 10.3kg (measured ~ 353mm)

OEM Rear 299mm Rotors 5.6kg, GiroDisc 325mm Rear Rotors 5.7kg (note these measured closer to ~322mm)

As far as braking goes there might be a perceived psychological improvement but otherwise no issues and I have not noticed any fade even after 5 or 6 laps on a short track. I did have to get my workshop to adjust the rear E-brake so the hub tolerances must have been marginally different.

Asthetically I think they look nice, particularly the anodised alloy hats in contrast to the OEM Porsche rotors which always look rusty.

Here is what's in the kit including front and rear caliper spacers and longer bolts:



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Yes, it's a long-run cost-savings, but if you're hard on your brakes the OEMs can stress crack early in their lifespan, whereas the Giros won't, thus tilting the balance towards the GiroDiscs sooner.
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@Ed @ EQT No, the fronts are 330mm and the rears are 300mm.

@don The one-use caliper bolts are why a lot of folks just get a set of caliper studs and be done with it.
@Ed @ EQT I ran the DS3.12 pads for five track days with the stock rotors (Thunderhill and Laguna Seca). The days at Thunderhill saw temps over 100° F. Even with those conditions the OEM rotors held up just fine—no cracking around the holes, but they did get a bit worn.

Regardless, the Girodisc are a better long-term investment—enjoy yours!
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Sure I can see the caliper studs are very useful if you are regularly changing pads but for us who are changing maybe every two years or so on relatively new cars I'm not sure if it is necessary.

One brake expert thought that the one-use caliper bolts was "Porsche nonsense". Another place I read that it was more to do with the thread lock that can come on new bolts or for very old cars where they can become seized.

I've also read if you are replacing pads regularly then the removal and reinstallation of the bolts will wear the threads in the uprights, hence the studs, and/or weaken the bolts necessitating replacement, but maybe once in a blue moon is not a problem.
I've done enough work with aluminum to be very wary of steel bolts threading into aluminum, like Porsche's steel caliper bolts threading into the aluminum uprights. If I can put studs in uprights once, and be done with it for the likely life of the car, I'm all-in. But, as you point out, YMMV!
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