Wheels, 19 inch (48.3 cm), aluminum, Polished/Dark Android finish

Years 2007, 2025–26 Models 2 Factory citations 4

Query this via API →

Also described as Tire, all, 235/60R18 front and 255/55R18 rear

Documented applications

CT5 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

only in: CT5-V, CT5-V Blackwing; V-Series: not available; V-Series Blackwing: S; the 2026 list says forged alloy

GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide, p.8.

SRX — Sigma / GMT265 (2004–2009)

2007 Factory-verified

Appears on the 2007 list alone; it prints the Q16 sizes without the P prefix.

GM factory document — 2007 cadillac srx rpo code list, p.1.

This page aggregates every documented appearance of Q63 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.