Do I need wheel spacers for my Porsche 911 GT3 R rennsport?

No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.

What's the difference between wheel offset and backspacing?

Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.

Can I run staggered wheels (different sizes front and rear) on my Porsche 911 GT3 R rennsport?

The Porsche 911 GT3 R rennsport runs the same wheel size front and rear from the factory, so staggered fitment is not required. ANKUSI can still forge a staggered set (wider rear) on request if you want a more aggressive stance.

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2023 Porsche 911 GT3 R rennsport Wheels & Rims: Bolt Pattern, Offset & Sizes

Fitting Porsche 911 GT3 R rennsport wheels? This page gives the 2023 Porsche 911 GT3 R rennsport bolt pattern, centre bore, factory rim size and the offset range for aftermarket and forged Porsche 911 GT3 R rennsport rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.

Porsche 911 GT3 R rennsport (2023): F 18x12.0J / R 18x13.0J on a centerlock hub. Competition/one-off vehicle -- no aftermarket data published.

Bolt PatternCenterlock (racing hub)

Wheel Bolt/NutCentre-lock single nut (racing hub)

Wheel Load Rating700–850 kg/wheel (Performance / Sports Car segment reference)

Caliper TypeFixed 6-piston front caliper (OEM, Porsche GT/RS)

Year2023

✓ Verified by ANKUSI's Engineering Team — IATF 16949 & ISO 9001 certified forged wheel manufacturer, TÜV/SFI/VIA compliant. See our factory & certifications →

How to Read Wheel Offset & Measurements

Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.

Diagram showing wheel measurement points: centerline, center bore diameter, PCD, offset, rim width and diameter — Centerline, center bore, PCD, offset, width & diameter

Diagram comparing positive, zero, and negative wheel offset relative to the wheel centerline — Positive vs. zero vs. negative offset

ANKUSI Engineering Expert Advice

On a homologated racing or prototype hub, there's no aftermarket offset range to reference — there's no enthusiast community running this exact hub pattern, because every wheel on a build like this is application-specific. Forging still matters here, arguably more than on a road car: less rotational mass translates directly into faster acceleration, shorter braking distances and quicker direction changes, without touching the homologated hub geometry the racing series or one-off build already specifies.

The Porsche 911 GT3 R rennsport runs F 18x12.0J / R 18x13.0J on a homologated racing hub, not a standard retail bolt pattern. ANKUSI's motorsport program forges to this exact homologated specification rather than offering generic Flush or Maximum Aggressive references, which would be meaningless on a hub this specialized — contact us with your series or application's exact hub requirements.

Porsche 911 GT3 R rennsport Wheel & Hub Specs

Correction (2026-09-20): the centre bore figure previously shown here (71.6mm) was the road-car 911 hub specification and does not apply to this vehicle. Purpose-built Porsche Motorsport centre-lock racing hubs do not use the production hub-centric bore, so the figure has been withdrawn rather than restated. Confirm the exact hub interface with Porsche Motorsport for any build.

The 2023 Porsche 911 GT3 R rennsport (GT / Cup Race Car) runs F 18x12.0J / R 18x13.0J on a centerlock racing hub. These are the factory or homologated racing specifications, not a standard retail bolt pattern.

Why We Don't Publish Generic Aftermarket Fitment for This Vehicle

The Porsche 911 GT3 R rennsport is a competition, prototype, vintage or one-off commissioned vehicle. Unlike a mass-produced road car, there is no generic enthusiast community publishing "Flush" or "Maximum Aggressive" offset ranges for it, and its hub uses a centerlock racing assembly rather than a standard lug-bolt pattern. Publishing invented offset numbers for a car like this would be misleading, so we don't.

Custom & Motorsport Wheel Program

ANKUSI forges wheels to exact motorsport specifications -- centerlock, beadlock, homologation-compliant, restoration-correct, or one-off replica builds. Contact ANKUSI with your exact hub pattern, offset and application and we will confirm whether we can build for it.

Custom Forged Wheels for the Porsche 911 GT3 R rennsport (2023)

Everything above is reference data. If you want wheels actually built to it, that is what ANKUSI does: we are a forged wheel factory in Guangzhou, China, IATF 16949 and ISO 9001 certified, forging on our own 10,000-ton press and producing over 120,000 wheels a year. Forging blank, CNC machining, finishing, coating and inspection all happen in the same building — nothing is subcontracted and nothing is relabelled from another manufacturer.

Every set is cut to order. Diameter, width, offset, concavity, monoblock or multi-piece construction and the finish are all yours to choose.

We do not hold this pattern wheels on a shelf — they are forged to order, which is why any offset, width and bore combination on this page is buildable rather than limited to a stock list.

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Frequently Asked Questions

Does the Porsche 911 GT3 R rennsport use a standard bolt pattern?
No. It uses a centerlock racing hub, not a retail lug-bolt pattern, so off-the-shelf aftermarket road wheels do not apply.

Can ANKUSI build wheels for a Porsche 911 GT3 R rennsport?
Yes, on a custom-quote basis for restoration, motorsport or replica applications. Contact us with your exact specifications.

Why isn't there a Flush/Max fitment guide for this car?
Flush and Maximum Aggressive figures on our other pages come from verified enthusiast community data for mass-produced road cars. No such generic data exists for this vehicle, so we don't fabricate it.

Forged Wheel Designs for the Porsche 911 GT3 R rennsport

Every design below is forged to order, so it can be machined to the Porsche 911 GT3 R rennsport's bolt pattern, with the width and offset calculated for your setup.