997 Turbo / GT2 2006–2012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.
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Internal diameter 997 GT2 brake clearance

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Old Jan 24, 2021 | 04:57 AM
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Internal diameter 997 GT2 brake clearance

Morning all. I have a GT4 with the big 991 GT3 brake calipers up front. Steel and 380mm. The 19s i have bought dont quite fit!

planning to move to 997 GT2rs/cup calipers instead whcih should help me to fit some big barrel 18” wheels.

it would be really helpful if anyone can tell me the minimum internal diameter needed to clear the GT2RS 380mm calipers so I dont mess up again.

sorry to ask such an obscure question as a first post.

the GT4 / 991 must need about 445mm for good clearance so am hoping the 997 380mm calipers need less than 440z
 
Old Feb 2, 2021 | 08:13 AM
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OK, I have sourced some GT3 997.2 calipers and measured - I believe that they require a 432mm internal diameter for zero clearance. The 911 GT£ are 442-445mm.

Just in case anyone needs to know in the future.
 
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