GMC Sierra 1500 Bolt Pattern, Wheel & Tire Sizes
TL;DR
The Sierra 1500 has kept the same 6x139.7 (6x5.5) bolt pattern and 78.1 mm centre bore since 1999, so wheels swap between generations, but stock rim and tire sizes vary a lot by trim and year.
Bolt pattern has stayed consistent since 1999
Unlike some SUVs that change bolt pattern across generations, the full-size GMC Sierra 1500 has used 6x139.7 mm (6x5.5 in) continuously from the 1999-2006 GMT800 generation through the current T1XX-based trucks. This was confirmed on wheel-size.com listings for the 1999-2006, 2007-2013, 2014-2018 and 2019-2023 ranges, all showing the same pattern with a 78.1 mm centre bore and M14x1.5 stud thread.
What changes between generations
What does change substantially is the factory wheel diameter and tire size offered per trim. Early 2000s base trucks commonly rode on 16-17 inch steel wheels, while modern SLT, AT4 and Denali trims are offered with 20 inch and larger wheels from the factory. Diesel and higher payload configurations often get different (frequently taller sidewall, LT-rated) tires than gas half-ton trims, even within the same model year.
Centre bore and hub rings
The 78.1 mm centre bore figure is well corroborated across the 1999-2018 trucks. For 2019-and-newer T1XX-generation Sierras, some fitment databases list a narrow 77.8-78.1 mm range depending on the specific listing, so if you are fitting aftermarket wheels with a different bore, use hub-centric rings rather than assuming a bare number.
Always confirm on your own truck
Because wheel and tire choice varies by trim, engine and even by regional market, do not rely solely on a generation-wide table. Before buying wheels or tires, check:
- The driver-side door jamb placard, which lists the factory tire size and cold inflation pressure for your exact build
- The owner's manual tire and loading information section
- The size markings molded into the sidewall of your current tires
- GM's/GMC's towing and capacities guide if you plan to change wheel or tire diameter, since it can affect speedometer calibration and payload rating
Specifications by generation
| Generation / years | Bolt pattern | Centre bore | Stud thread | Stock wheel sizes | Common tire sizes |
|---|---|---|---|---|---|
| GMT800 (1999-2006) | 6x139.7 (6x5.5) | 78.1 mm | M14 x 1.5 | 16-17 in steel/alloy | 245/75R16, 265/70R17 (varies by trim) |
| GMT900 (2007-2013) | 6x139.7 (6x5.5) | 78.1 mm | M14 x 1.5 | 17-20 in alloy | 245/70R17, 265/65R18, 275/55R20 |
| K2XX (2014-2018) | 6x139.7 (6x5.5) | 77.8-78.1 mm | M14 x 1.5 | 17-20 in alloy | LT245/75R17, LT265/70R17, LT265/65R18, LT275/55R20 |
| T1XX (2019-present) | 6x139.7 (6x5.5) | 77.8-78.1 mm | M14 x 1.5 | 17-22 in alloy | 255/70R17, 265/65R18, 275/60R20 (AT4/Denali trims vary) |
Summary
| Bolt pattern (all generations, 1999-present) | 6x139.7 mm (6x5.5 in) |
|---|---|
| Centre bore, 1999-2018 | 78.1 mm |
| Centre bore, 2019-present | 77.8-78.1 mm (sources vary slightly) |
| Stud thread | M14 x 1.5 |
| Stock wheel size range | 16 in to 22 in depending on trim/year |
| Common tire sizes | 245/75R16 up to 275/60R20, trim dependent |
| Authoritative source for your exact truck | Driver door jamb placard and owner's manual |
Full diagnostics
For the complete step-by-step diagnostic and repair guide, see GMC Sierra 1500: Common Problems, Fault Codes & Repairs.
Frequently asked questions
Do wheels from an older Sierra 1500 fit a newer one?
In terms of bolt pattern, yes: every generation from 1999 onward uses 6x139.7 (6x5.5) with a 78.1 mm centre bore and M14x1.5 studs, so the wheels will physically bolt on. However, offset, wheel diameter and load rating differ by trim and year, so check that the specific wheel's offset and load rating match your truck before installing it.
What is the factory lug nut torque for a Sierra 1500?
We could not verify a single torque figure that applies across all Sierra 1500 generations and trims from a corroborated source, and GM has changed stud/nut specifications over the years. Look up the torque value in your owner's manual or a generation-specific factory service manual rather than relying on a generic number.
Why do two trucks of the same model year have different tire sizes?
GMC offers different wheel and tire packages depending on trim (base, SLE, SLT, AT4, Denali), cab/bed configuration, and engine, since these affect load capacity and ride height. The only way to know your exact factory size is to check your door jamb placard or the sidewall markings on your current tires.
Is the centre bore the same on all Sierra 1500 wheels?
Multiple listings agree on 78.1 mm for 1999-2018 trucks. For 2019-and-newer T1XX trucks, some databases show a slightly narrower 77.8-78.1 mm range across listings, likely reflecting rounding differences between sources rather than a real running change. If you are installing an aftermarket wheel with a different bore diameter, use a hub-centric ring to take up the gap safely.