summability

Hi all,

I'm waiting to hear back from Ira at Tarret Engineering but figured I'd ask the question here as well. Anyone running the Tarret brake caliper studs with Girodisc rotors? If so which stud length front and rear and do you need the Tarret spacer kit for the front or rear?

What does Girodisc provide for caliper spacers, I think I've seen 6mm front and 12mm rear?

Thanks!

Clark-ApexPerformance

Giro Disc Spacers are 6MM for the front and 12MM for the rear. This is for the standard set up for the front. They also offer a rotor with hat that allows you to run the GT3 pad up front. The caliper on the front of your car is the same as the GT3 but for unknown reasons Porsche made the hat enlarged on the 991S and GTS. The larger hat doesn't allow you to the GT3 pad. Giro Disc has made the hat smaller so you are able to run the GT3 pad. If you go with the GT3 set up there are no spacers in the front.
AS to how long the studs should be....call Ira and ask. The GT3 set up should take an 85MM the stock set up should be 95-100MM....Again call Ira.

summability

Wow, awesome! Thanks for the great info, had no idea moving up to the GT3 pad was even an option. Definitely going to go that route. Thanks again!

Tarett Engineering

Without the Giro Disc rotors, you'd want the 85mm size studs. The 6mm and 12mm spacers brings it to a theoretical 91mm and 97mm. Our closest sizes are 85mm and 95mm. I think the 95mm size is your only option in back, and has a good chance of working. Used with the 95mm Giro adaptor sleeves. In front, you're right in the middle of the two sizes. It's possible that ether would fit, but we haven't tried it and there's only one way to know for sure. If you'd like to try one or the other or both, you can return whatever doesn't get used.

Ira

summability

Thanks Ira! I'll order both sizes and report back here with the results.