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The 2015 GMC Terrain can be fitted with a variety of tire sizes, including 225/65R17, 235/55R18, 235/60R17, 225/60R18, 235/55R19, and 245/45R20. No matter which tire size you choose, the recommended tire pressure is 35 psi. The corresponding rim sizes for these tires on the Terrain are 7Jx17, 7Jx18, 7Jx19, and 8Jx20. It's essential to know the correct tire size and pressure for your vehicle to ensure tire longevity. I advise you to inspect your tires before embarking on a long journey to prevent accidents. An underinflated tire can overheat and bulge, potentially leading to a blowout while driving.
In 2015, the GMC Terrain SL, SLE-1, SLE-2, and SLT-1 models all have standard P225/65R17 tires, while the Terrain SLT-2 and Denali models come with standard P235/R18 tires.