Buick Regal Sportback tire size
The most common factory tire size for the Buick Regal Sportback is 245/45R18, on 8 of the 16 year and trim fits listed. Each year below lists the sizes its trims were built with (2018 to 2020). Pick your year and trim to see the tires that fit.
Buick Regal Sportback tire sizes by year
20203 sizes · 6 trims
20193 sizes · 7 trims
245/45R18load index 96, speed rating H
245/40R19load index 94, speed rating W
P225/55R17load index 95, speed rating H
20183 sizes · 6 trims
245/45R18load index 96, speed rating H
P225/55R17load index 95, speed rating H
245/40R19load index 94, speed rating W
Check your own tire
A trim can be sold with more than one wheel size. The size printed on the sidewall of your current tire, or on the placard in the driver's door jamb, is the one your vehicle has.