Porsche 911 GT3 RS 992.1 (2023–2025) Wheel Fitment Guide
The 2023–2025 Porsche 911 GT3 RS sits in a completely separate fitment universe from the GT3, GT3 Touring, and S/T despite sharing the same badge family. Where those three models use the Carrera-family body, the GT3 RS uses the Turbo-wide body — 48mm wider at the rear. That wider body requires wider wheels at a different offset: the GT3 RS runs 10″ fronts and 13″ rears versus the GT3’s 9.5″ and 12″. The GT3 RS wheel dimensions are not interchangeable with any other 992.1 model.
The GT3 RS ships exclusively with Michelin Pilot Sport Cup 2 tires on forged aluminum centerlock wheels. The Weissach Package upgrades these to forged magnesium, which alone saves approximately 18 lbs of unsprung and rotating mass. The standard 408mm steel brakes and optional PCCB ceramics both require a minimum 20″ front wheel — the same brake floor as the GT3 family. All GT3 RS builds are rear-wheel drive with PDK, and rear-axle steering is standard.
Platform hardware is consistent with all other 992.1 centerlock models: M48 centerlock nut, 900 Nm / 664 lb-ft, dedicated torque tool required, no spacers compatible, and direct TPMS sensors must be transferred or replaced when fitting aftermarket wheels.
Our flush fitment options are designed to work without rubbing while maintaining proper clearance and everyday drivability.
Factory Wheel & Tire Configurations
The 992.1 GT3 RS has one standard wheel configuration and two optional upgrade packages — all sharing the same 10Jx20 / 13Jx21 dimensions. The difference between them is construction material and weight. The standard wheel and the lightweight aluminum are both forged aluminum; the Weissach magnesium is forged magnesium. None of these wheel packages cross-fit with the GT3 or GT3 Touring — they are GT3 RS specific.
Aftermarket Wheel & Tire Configurations
The 992.1 GT3 RS aftermarket wheel market is principally driven by one need: a lighter or more durable alternative to the factory forged aluminum or magnesium wheels for track use. Because the GT3 RS already ships with performance-appropriate OEM dimensions, most aftermarket work targets the same 10Jx20 ET45 / 13Jx21 ET31 spec in different constructions or at a lower price point than OEM magnesium. Smaller front diameters (19″) are possible only with an aftermarket brake swap — neither the factory 408mm steel nor the 410mm PCCB ceramics clear a 19″ front. All setups in this guide use 20″ fronts and clear the factory brakes in both specifications.
The 992.1 GT3 RS is in a completely separate fitment universe from the GT3, GT3 Touring, and S/T. Despite sharing the same engine family and GT badge, the GT3 RS uses the wider Turbo body — 48mm wider than the GT3's Carrera-family body. The GT3 RS wheels (10Jx20 ET45 / 13Jx21 ET31) cannot be directly substituted with GT3 wheels (9.5Jx20 ET46 / 12Jx21 ET45), and vice versa. The rear ET31 offset on the GT3 RS is the lowest of any 992.1 wheel, required by the wider track width on the Turbo body. Both the standard 408mm steel brakes and optional PCCB ceramics require a minimum 20" front wheel. The centerlock nut must be torqued to 900 Nm with a dedicated tool — impact wrenches are never appropriate.
Flush Fitment
Staggered Setup
Not Sure What Works for Your Build?
The GT3 RS is in its own fitment world — wider wheels, dramatically lower rear offset, and magnesium OEM options that require dedicated care. Whether you’re looking for lighter aftermarket alternatives to protect the Weissach mags on track, confirmed OEM-spec replacement options, or have questions about what fits and what doesn’t on this platform, reach out.
FAQ - Frequently Asked Questions
No — the GT3 RS and GT3 use completely different wheels. The GT3 RS uses 10Jx20 ET45 front and 13Jx21 ET31 rear with 275/35ZR20 and 335/30ZR21 tires. The GT3 uses 9.5Jx20 ET46 front and 12Jx21 ET45 rear with 255/35ZR20 and 315/30ZR21 tires. The GT3 RS is 0.5″ wider at the front, 1″ wider at the rear, and runs a dramatically lower rear offset (ET31 vs ET45). These differences reflect the GT3 RS’s use of the wider Turbo body versus the GT3’s Carrera-family body. The wheels are not interchangeable.
The Turbo-wide body — 48mm wider at the rear than the Carrera-family body used by the GT3, GT3 Touring, and S/T. The GT3 RS shares its body width (1,900mm without mirrors) with the Turbo, Turbo S, and Sport Classic. The wider rear fenders accommodate the 13″ rear rim and 335mm-wide rear tire. This is why the GT3 RS is in a completely separate fitment universe from the GT3 family despite the shared badge and engine.
Standard delivery: forged aluminum centerlock, 10Jx20 ET45 front with 275/35ZR20 Michelin Pilot Sport Cup 2 tires, 13Jx21 ET31 rear with 335/30ZR21. Two optional upgrades share the same dimensions: the Lightweight Aluminum set (~1.3kg lighter per set, multiple finishes including Pyro Red, Neodyme, Indigo Blue, Satin Black) and the Weissach Magnesium set (~8.7kg lighter per set, comes with the Weissach Package). The standard, lightweight aluminum, and Weissach magnesium wheels are all identical in size — the differences are weight and construction material.
The Weissach Package bundles the forged magnesium wheels with additional CFRP (carbon-fiber reinforced plastic) components: front and rear anti-roll bars, rear coupling rods, and the rear axle shear panel. These replace equivalent components that would otherwise be made from steel or aluminum. The combination of magnesium wheels and CFRP chassis components reduces total vehicle weight meaningfully. The magnesium wheels alone account for approximately 18–19 lbs of the total weight reduction.
Standard: 6-piston 408mm front / 4-piston 380mm rear, gray cast iron composite discs. Note that the GT3 RS uses larger front brake pistons (32mm vs the GT3’s 30mm) and thicker front rotors (36mm vs 34mm) despite the same 408mm diameter — the GT3 RS’s steel brakes are more capable than the GT3’s despite appearing identical from spec sheets. Optional PCCB: 6-piston 410mm front / 4-piston 390mm rear. Both configurations require a minimum 20″ front wheel.
900 Nm / 664 lb-ft using a dedicated centerlock torque tool. Impact wrenches must never be used — they damage the anodized nut profile and prevent proper seating. Options include the Porsche factory tool, HYTORC Lion Gun kit, and RENNtorq V2. For owners without the correct equipment, wheel changes should be done at a Porsche service center or shop with the proper tool.
The primary aftermarket approach for the 992.1 GT3 RS is running OEM-spec replacement wheels (10Jx20 ET45 / 13Jx21 ET31) in aftermarket forged aluminum or magnesium — this preserves factory tire compatibility while potentially reducing weight and cost versus OEM magnesium. Running 19″ front wheels requires replacing the factory front brakes — neither the standard 408mm steel calipers nor the 410mm PCCB ceramics will clear a 19″ front wheel. The market for validated GT3 RS-specific aftermarket fitments in non-OEM sizes is limited; OEM-size replacements are the well-documented path.
pH-neutral cleaners only — this is non-negotiable for magnesium. Standard wheel cleaning products are typically alkaline or acidic and will corrode magnesium alloy over time, starting at seams and spoke edges. Use products specifically marked as safe for magnesium or explicitly pH-neutral. Regarding the Porsche Wheel Protection Plan: coverage terms vary. Some owners have reported successful claims on magnesium wheels; others find magnesium excluded in the written policy. Confirm coverage with your specific policy before incurring damage.
Both use the same Turbo-wide body and the same 5×130 / 71.6mm CB centerlock hub hardware, so the wheel will physically mount. However the dimensions are completely different — Turbo S ships with 9.5Jx20 ET44 / 12Jx21 ET70, while the GT3 RS uses 10Jx20 ET45 / 13Jx21 ET31. The GT3 RS’s ET31 rear offset is dramatically more outward than the Turbo S’s ET70 rear, which would result in significant protrusion past the fender on a Turbo S. These wheels are not interchangeable in practice.
2023–2025 USDM. The 992.1 GT3 RS was unveiled August 2022 and US deliveries began for MY2023. As of mid-2025, the 992.1 GT3 RS continues in production while the 992.2 GT3 RS is in development — the 992.2 GT3 RS is not covered by this guide.