2005 Pontiac Grand Prix Tire Sizes

Factory original equipment (OE) tire specifications.

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Base

Tire Size
P225/60R16
Load Index
97
Speed Rating
S

GT

Tire Size
P225/60R16
Load Index
97
Speed Rating
S

GTP

Tire Size
P225/55R17
Load Index
95
Speed Rating
H

GTP w/Competition Group Pkg.

Tire Size
P225/55R17
Load Index
95
Speed Rating
V

GXP

Front
Tire Size
P255/45R18
Load Index
99
Speed Rating
W

GXP

Rear
Tire Size
P225/50R18
Load Index
94
Speed Rating
W