Buick Regal tire size
The most common factory tire size for the Buick Regal is 235/50R18, on 22 of the 50 year and trim fits listed. The table lists every year from 2011 to 2020 and the size each trim was built with. Pick your year and trim to see the tires that fit.
Buick Regal tire sizes by year
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.