GMC · Factory fitment
GMC Sierra 1500 tire size by year
Every factory tire size the Sierra 1500 was sold on from 1999–2026, worked out in inches, with the wheels they were fitted to.
2019–2026 · 4th gen (T1)
255/70R17
31.1" overall · 10.0" section width
Factory wheels: 17x8, 18x8.5, 20x9, 22x9
Sierra 1500 bolt pattern & torque → Sierra 1500 bed sizes & specs →
Trim and wheel package decide which of these your truck actually has. The placard inside the driver's door jamb is the authority for your specific vehicle, and it also carries the cold inflation pressures that go with each size.
Sierra 1500 factory tire sizes, generation by generation
Every Sierra 1500 tire size in inches
Metric sizes are hard to compare by eye. Here they are converted — overall diameter is what decides clearance, speedometer accuracy and effective gearing.
| Size | Overall diameter | Section width | Sidewall | Revs / mile | Used on |
|---|---|---|---|---|---|
| 275/60R20 | 33.0" | 10.8" | 6.5" | 611 | 2019–2026 |
| 275/50R22 | 32.8" | 10.8" | 5.4" | 614 | 2019–2026 |
| 275/55R20 | 31.9" | 10.8" | 6.0" | 632 | 1999–2018 |
| 265/70R17 | 31.6" | 10.4" | 7.3" | 638 | 1999–2018 |
| 265/65R18 | 31.6" | 10.4" | 6.8" | 639 | 2019–2026, 1999–2018 |
| 255/70R17 | 31.1" | 10.0" | 7.0" | 649 | 2019–2026 |
| 245/70R17 | 30.5" | 9.6" | 6.8" | 661 | 1999–2018 |
Sierra 1500 tire sizes — frequently asked
What size tires does a GMC Sierra 1500 take?
The 2019–2026 GMC Sierra 1500 was sold from the factory on 255/70R17, 265/65R18, 275/60R20, 275/50R22, on 17x8, 18x8.5, 20x9, 22x9 wheels. Which one your truck has depends on its trim and wheel package, so check the placard inside the driver's door jamb — that sticker lists the sizes your specific truck left the factory on, together with the correct cold inflation pressures.
How tall is a 255/70R17 tire in inches?
About 31.1 inches overall. The sidewall is 7.0 inches tall (70 per cent figures are of the section width, not the wheel), the section width is 10.0 inches, and it turns roughly 649 revolutions per mile. Those are the numbers to compare against when you are sizing up.
What is the biggest factory tire on a Sierra 1500?
Across 1999–2026 the largest factory size on record is 275/60R20 at about 33.0 inches tall, and the smallest is 245/70R17 at about 30.5 inches. If your truck came on the smaller size, the larger one is a known-good fitment for the same platform — which makes it the safest first upsize, though offset and trim still differ.
Can I put bigger tires on my Sierra 1500 without a lift?
Usually one size, around 3 per cent more overall diameter, fits on stock suspension. Past that you are into trimming the front valance or fitting a levelling kit, and the limiting factor is often the wheel offset rather than the tire height — a wider tire on a lower offset hits the fender liner at full lock long before diameter becomes the issue. Work out the exact clearance before you buy.
Do bigger tires affect the Sierra 1500's speedometer?
Yes, proportionally. A tire 3 per cent taller than stock makes the speedometer read about 3 per cent low, so an indicated 70 is really 72, and the odometer under-counts by the same amount. It also shifts the effective gear ratio, which on a truck that tows is felt as softer acceleration and more downshifting on grades.
What wheels fit a Sierra 1500?
Wheel fitment starts with the bolt pattern, then hub bore, then offset. All three for every Sierra 1500 generation are on the bolt pattern page for this truck, along with the stud thread and lug torque. The factory wheel sizes on this page tell you what widths and diameters the truck was engineered around.
