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Vehicle Fitment
Listed fitment: Porsche.
If you are unsure which Girodisc rotor fits your brake package, contact us before ordering.
GiroDisc D1-370 Porsche 991 Cup / GT4 Clubsport Factory Bells Front Replacement Brake Disc Rings
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GiroDisc D1-370 front replacement rings fit the factory tooth-drive centre bells used on the listed Porsche 991 GT3 Cup and GT4 Clubsport race cars. They retain the original bell and retaining system, making the bell type a decisive part of ordering the correct rings.
The replacement iron friction rings use the factory tooth-drive interface. This is a race-car service component for the brake configuration shown below. A road car sharing the GT4 name does not establish compatibility with the Clubsport mounting system.
Key Features
- Replacement cast-iron rings for the specified factory centre bells
- Factory tooth-drive mounting arrangement
- Supplied as a pair of rings
- Centre bells and mounting hardware are not included
Vehicle Fitment and Brake Setup
| Vehicle | Axle | Model years | Required brake setup |
|---|---|---|---|
| Porsche 911 GT3 Cup (991) | Front | Front/rear 32/30mm thickness, use with factory Porsche centre bells and retaining hardware | |
| Porsche Cayman GT4, GT4 RS Clubsport | Front | Front/rear 32/30mm thickness, use with factory Porsche centre bells and retaining hardware |
These rings do not fit GiroDisc centre bells. Retain the appropriate factory Porsche centre bells and retaining hardware, and inspect them before assembly. Confirm the installed bell system even when the car has previously had its brakes upgraded.
Product Specifications
| Part number | D1-370 |
| Brand | GiroDisc |
| Product type | Replacement Brake Disc Rings |
| Axle | Front |
| Diameter | 380mm |
| Thickness | 32mm |
| Sold as | Pair of rings |
| Centre bells | Factory Porsche tooth-drive bells |
| Hardware | Not included |
Recommended Supporting Upgrades
If the car already has GiroDisc centre bells, select D1-238 rings for GiroDisc bells for the compatible assembly instead.
Explore GiroDisc Porsche brakes and the complete GiroDisc range for supporting brake components.
Installation and Care
Use the factory tooth-drive and retaining-ring procedure for the confirmed brake assembly. Inspect the retained bells and retaining system, check the left/right ring orientation and follow the correct race-car servicing specification. Do not substitute the mounting procedure for a conventional GiroDisc bell-and-pin assembly.
Contact us to confirm availability and lead time before ordering.
Product images may be illustrative. Use the part number and specifications to confirm the item required.
Product specifications
- Brand
- Girodisc
- Product type
- Replacement Brake Rings
- Part number / SKU
- D1-370
- Vehicle make
- Porsche
Girodisc fitment can vary by factory brake package, disc diameter and caliper. Contact us with your registration or VIN and brake specification if you are unsure.
Warranty: Products are supplied with the applicable manufacturer warranty.
Shipping: We offer UK and worldwide shipping. Supplier-stock delivery estimates are shown above.
Returns: Special-order items may be subject to different cancellation/return conditions.
Klarna payment options are available at checkout where eligible.
Why buy from us?
Vehicle Fitment
Listed fitment: Porsche.
If you are unsure which Girodisc rotor fits your brake package, contact us before ordering.
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