Tire fitment
The 2025 GMC Sierra 1500 base tire size is 265/70R17 — 265 mm wide with a 70% aspect ratio on 17″ rims. 4 OEM sizes are available across trims.
2025 GMC Sierra 1500
265/70R1731.6″ overall diameter · 185.5 mm sidewall · ~638 rev/mi
| Trim | Tire size | Rim | Diameter | vs Base |
|---|---|---|---|---|
| Pro/SLE ★ | 265/70R17 | 8×17″ | 31.6″ (802.8 mm) | — |
| SLT/AT4 | 275/65R18 | 8.5×18″ | 32.1″ (814.7 mm) | +1.48% |
| Denali | 275/60R20 | 9×20″ | 33″ (838 mm) | +4.38% |
| Denali Ultimate | 275/50R22 | 9×22″ | 32.8″ (833.8 mm) | +3.86% |
The 2025 GMC Sierra 1500 ships with 265/70R17 tires on the base trim — that's an overall diameter of 31.6″. The 265 mm width and 70% sidewall ratio give you 185.5 mm of sidewall cushion between the rim and the road.
Match the load index and speed rating from your door-jamb placard — not just the size. If you're switching sizes, keep the overall diameter within ~3% to avoid speedometer error and potential ABS/traction-control issues.
Factory fitment for the 2025 GMC Sierra 1500; verify against your door-jamb placard or owner's manual.
The base 2025 GMC Sierra 1500 uses 265/70R17 tires — 265 mm wide, 70% aspect ratio, on 17-inch rims. The overall diameter is 31.6″ (802.8 mm). Higher trims use different sizes — see the table above. Confirm against your door-jamb placard.
Yes, within limits. Keep the overall diameter within about 3% of 31.6″ to avoid speedometer error and clearance issues. A wider tire may improve grip, but match the load and speed ratings your Sierra 1500 requires.
265/70R17 tires have an overall diameter of 31.6″ (802.8 mm), with a 185.5 mm sidewall height. That's about 638 revolutions per mile.
The 2025 GMC Sierra 1500 tire sizes shown are OEM factory fitments. Confirm your exact tire size, load rating, and speed rating against the door-jamb placard or owner's manual before buying tires.