2018 Buick Regal Sportback Tire Sizes
Factory original equipment (OE) tire specifications.
Base
Tire Size
P225/55R17
Load Index
95
Speed Rating
H
Essence
Tire Size
245/45R18
Load Index
96
Speed Rating
H
GS
Tire Size
245/40R19
Load Index
94
Speed Rating
W
Preferred
Tire Size
P225/55R17
Load Index
95
Speed Rating
H
Preferred
Tire Size
245/45R18
Load Index
96
Speed Rating
H
Preferred II
Tire Size
245/45R18
Load Index
96
Speed Rating
H