Tire, compact spare 16" (40.3 cm), located under cargo floor

Years 2008–09, 2025–27 Models 3 Factory citations 9

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Also described as Tire, compact spare 16 inch (40.3 cm)Tire, spare, compact, T125/70R16

Also documented for Chevrolet

Documented applications

Encore GX — VSS-F (2020–2027)

2025–2027 Factory-verified

2025: Preferred, Sport Touring, Avenir: S. 2026–2027: Preferred, Sport Touring, Avenir: O; includes a 16 inch spare wheel and the Q8E jack; standard in 2025, a factory option from 2026 (GM Authority, 2025-03)

GM factory document — 2025 buick encore gx fleet order guide, p.7.
GM factory document — 2026 buick encore gx fleet order guide, p.13.
GM factory document — 2027 buick encore gx fleet order guide, p.13.

Envista — VSS-F (2024–2027)

2025–2026 Factory-verified

all trims: S

GM factory document — 2025 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2025 buick envista fleet order guide, p.5.
GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.5.

LaCrosse — W-body / GMX365 (2005–2009)

2008–2009 Factory-verified

GM factory document — 2008 buick lacrosse rpo code list, p.1.
GM factory document — 2009 buick lacrosse rpo code list, p.1.

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