Wheel, spare, 18 x 8.0 (45.7 cm x 20.3 cm), steel

Years 2017, 2025–27 Models 2 Factory citations 6

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Also described as Spare, full-size, 18 inch wheel and tire

Also documented for GMC

Documented applications

Caprice — Caprice PPV (2011–2017)

2017 Factory-verified

standard for 2017 (GM's 2017 changes); includes an unprogrammed tire pressure sensor

GM factory document — 2017 chevrolet caprice ppv order guide copy gm authority, p.2, p.12.

Silverado EV — BT1 (2024–2027)

2025–2027 Factory-verified

2025: S in 2WT, 5WT, 8WT, 3LT; not offered in 2SP, 3SP; 2026: S in 4WT, 5WT, 8WT, 2LT, 3LT, 4LT; not offered in 2TR, 3TR, 2SP, 3SP; 2027: S in 4WT, 5WT, 8WT, 2LT, 3LT; not offered in 2TR, 3TR

GM factory document — 2025 chevrolet silverado ev fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet silverado ev fleet order guide rpo codes, p.1.
GM factory document — 2025 chevrolet silverado ev fleet order guide, p.10.
GM factory document — 2026 chevrolet silverado ev fleet order guide, p.13.
GM factory document — 2027 chevrolet silverado ev fleet order guide, p.12.

This page aggregates every documented appearance of SG8 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.