The 2017 GMC Terrain offers a range of tire sizes designed to balance comfort, efficiency, and light off-road capability. Choosing the correct size is essential for safety, ride quality, and maintaining your SUV's warranty and resale value.
Below is a detailed reference for 2017 Terrain tire specifications, including stock sizes by trim, load index options, and speed ratings to help you make an informed decision.
| Trim Level | Stock Tire Size | Load Index | Speed Rating |
|---|---|---|---|
| S, SL | P235/65R17 | 101 | T |
| Preferred | P235/65R17 | 101 | T |
| SLT-1, SLT-2 | P235/60R18 | 102 | T |
| Denali | P235/55R19 | 101 | V |
Understanding 2017 Terrain Tire Dimensions
Tire dimensions directly affect speedometer accuracy, clearance, and handling. The 2017 Terrain uses P-metric sizing, where the code indicates section width, aspect ratio, construction, and rim diameter.
For example, P235/65R17 means a 235 millimeter wide tire with a 65 percent aspect ratio, built with radial construction, mounted on a 17-inch wheel. Keeping these proportions consistent across all corners helps maintain stable traction and predictable steering response.
Recommended Replacement Sizes by Trim
Factory recommendations ensure your Terrain performs as engineered. Matching the replacement size to your specific trim supports proper load distribution and avoids interference with suspension components.
S, SL, and Preferred Line
These trims come from the factory with P235/65R17 tires. When replacing, choose the same size unless you plan to discuss offset and load capacity changes with your tire professional.
SLT-1 and SLT-2
The SLT trims step up to P235/60R18, which offers a slightly lower profile while staying within the overall diameter close to the smaller sizes. This helps preserve speedometer accuracy if you move up in rim diameter.
Denali
The Denali trim uses P235/55R19, a sportier, lower-profile setup. Owners enjoy a firmer ride feel and improved high-speed stability, though this size may be more vulnerable to pothole damage.
Load Capacity and Speed Rating Insights
Load index numbers indicate the maximum weight a tire can safely carry at cold pressures. The Terrain's common 101 and 102 ratings support the SUV's structure during daily driving and light hauling.
Speed ratings, such as T and V, define the maximum speed at which the tire can operate safely under continuous use. Matching or exceeding the original rating is critical for high-speed stability and compliance with safety testing.
Key Takeaways for Tire Selection
- Match the original size shown for your trim to preserve handling and speedometer accuracy.
- Consult your owner’s manual or door placard for proper inflation pressures after any size change.
- Choose a load index equal to or higher than the factory recommendation for your usage.
- Consider driving conditions and ride preferences when selecting between all-season and touring tires.
- Have any tire work performed by a certified shop to ensure correct mounting and balancing.
FAQ
Reader questions
Can I use a larger rim on my 2017 GMC Terrain without issues?
Yes, you can use a larger rim, but you must select a tire with an appropriate section width and profile to avoid rubbing against the fenders and to maintain proper suspension geometry.
What happens if I install tires with a lower speed rating than specified?
Installing a tire with a lower speed rating can cause overheating and uneven wear at highway speeds, and it may violate insurance or warranty agreements tied to the original specifications.
Are all-season tires the best choice for the 2017 Terrain?
For most owners, all-season tires deliver balanced traction, comfort, and longevity across varied climates, though drivers in areas with heavy snow or extreme heat may benefit from dedicated seasonal tires.
Does the tire pressure change when switching tire sizes?
Yes, different diameters and widths require updated pressure settings. Always refer to the placard on the driver’s door jamb and not the sidewall of the tire to set correct inflation.