Wheels, 18 x 9 black aluminum with machined accents

Years 2024–26 Models 3 Factory citations 8

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Also described as Wheels, 18" (45.7 cm), machined aluminum with high gloss black accents

Also documented for Chevrolet

Documented applications

Hummer EV Pickup (2022–2027)

2024–2026 Factory-verified

2024: GM Authority 2024 changes page

GM factory document — 2025 gmc hummer ev pickup fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc hummer ev pickup fleet order guide rpo codes, p.1.

Hummer EV SUV — BT1 (2024–2027)

2025–2026 Factory-verified

requires the Extreme Off-Road Package (Z6X) in 2026; not available with RB9. 2025: O in 1SF, 1SG; 2026: O in 1SF, 1SG; not offered in 3VL.

GM factory document — 2025 gmc hummer ev suv fleet order guide, p.19.
GM factory document — 2026 gmc hummer ev suv fleet order guide, p.23.

Sierra HD — T1XX (2020–2027)

2024–2026 Factory-verified

only in: 2500 HD; 2024: GM Authority 2024 changes page; AT4X: S; Pro, SLE, SLT, AT4, Denali, Denali Ultimate: not offered

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.10.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.9.

This page aggregates every documented appearance of RCS in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.