What offset works on a 2023 Porsche 911 GT3 RS?

The accepted range is ET25 to ET55; factory is ET45 front, ET31 rear. Tire Rack stocks exactly two wheels for this car: OZ Racing Atelier Forged Ultimate Alu Centerlock in Black or White Gold, 20x10 ET45 / 21x13 ET31, 20.8 / 24.6 lb, $9,442.82 the set, special order.

IN SHORT

The accepted range is ET25 to ET55; factory is ET45 front, ET31 rear.

2023 Porsche 911 GT3 RS on its factory wheels

01Range and factory point

RANGE

ET25 to ET55

FACTORY FRONT

ET45

FACTORY REAR

ET31

Tire Rack stocks exactly two wheels for this car: OZ Racing Atelier Forged Ultimate Alu Centerlock in Black or White Gold, 20x10 ET45 / 21x13 ET31, 20.8 / 24.6 lb, $9,442.82 the set, special order.

Elsewhere in the center-lock world: BBS FI-R CL, OZ Superforgiata CL, APEX VS-5RE (2,100 lb load rating), Forgeline, HRE — all 20/21 in the factory sizes. Not sold by Tire Rack today.

Tires are the real decision on this car. Porsche N-spec: Michelin Pilot Sport Cup 2 N0 (factory), Cup 2 R N0, Pirelli P Zero Corsa PZC4 N0, P Zero Trofeo RS N0, Goodyear Eagle F1 SuperSport R N0 / RS N1, Michelin Pilot Sport S 5 N0 for street. All at Tire Rack in 275/35ZR20 & 335/30ZR21.

02Listed wheels by offset

O.Z. RACING ATELIER FORGED ULTIMATE ALU CENTERLOCK — 20×10 ET45 front / 21×13 ET31 rear · 24.6 lb · $9,443 the set · special order

→Verified for this car

O.Z. RACING ATELIER FORGED

ULTIMATE ALU CENTERLOCK

20×10 ET45 front / 21×13 ET31 rear · 24.6 lb / corner · special order

$9,443 / set, list price Sep 4, 2026

Check fit & buy →

Fitment is computed from published vehicle data and the retailer's listed sizes (catalog 2026-09-04-tirerack-d, verified on Sep 4, 2026). Prices are list prices on that date. Verify with your installer before you buy. Buy links may be affiliate links.

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