Q21 ✓ Factory-verified

Chevrolet · Regular Production Option

Wheels, 18 inch (45.7 cm) polished forged aluminum

Years 2025–27 Models 1 Factory citations 3

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Also documented for GMC

Documented applications

Silverado HD (T1XX, 2020–2027) →

• 2025–2027 ✓ Factory-verified

  only in: 3500 HD, 3500 HD chassis cab

  ⛭ GM factory document — 2025 chevrolet silverado 3500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 chevrolet silverado 3500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 chevrolet silverado 3500 hd retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of Q21 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.