2023 PORSCHE 911 GT3 RS · 992 · VERIFIED ON SEP 4, 2026
Why can't I run 19s on a 2023 Porsche 911 GT3 RS?
408mm front rotors and center-lock hubs: 20-inch front / 21-inch rear center-lock wheels only. Minimum diameter is 20 inches; the front rotor is 408x36mm (PCCB 410mm front / 390mm rear).
408mm front rotors and center-lock hubs: 20-inch front / 21-inch rear center-lock wheels only.
01The brake fact
Source: Porsche Newsroom 992 GT3 RS press kit (408 mm front discs, 36 mm thick, 6-piston monobloc; 380 mm rear; PCCB 410/390) — corrected from 408x34 on 2026-09-18; APEX 992.1 GT3 RS fitment guide brake clearance list; retailer by-vehicle results (2 center-lock models).
Center-lock hubs — bolt-on 5x130 wheels cannot fit. Every wheel here is a center-lock design.
Factory: 20x10 ET45 front on 275/35R20, 21x13 ET31 rear on 335/30R21. Those are the only diameters that clear the 408mm front brakes.
Tire Rack stocks two center-lock wheels for this car (OZ Ultimate Alu, Black or White Gold). The bigger decision on an RS is the tire: Cup 2 N0 (factory), Cup 2 R, Trofeo RS, or Pilot Sport S 5 for street.
The 991.2 GT3 RS is a different fitment (20/20 on 265/35 & 325/30) — confirm generation.
Center-lock hubs. Bolt-on 5x130 wheels do not fit — every wheel must be a center-lock design. 20-inch front / 21-inch rear is the only factory diameter combination; 408 mm front rotors rule out anything smaller. Front steel 408x34 mm, 6-piston (PCCB 410x34 mm), rear steel 380x30 mm, 4-piston (PCCB 390x30 mm).
02Wheels at the minimum diameter
- 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
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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