Chevrolet Silverado 1500 Bolt Pattern, Wheel & Tire Sizes
TL;DR
6x139.7 mm (6x5.5 in), 78.1 mm center bore, M14x1.5 studs - unchanged from the 1999 GMT800 through today's T1XX Silverado 1500. Wheel diameters grew from 16-17 in on early trucks to 17-24 in on modern High Country trims.
Bolt pattern and center bore
Two independent wheel-fitment sources (a bolt-pattern reference guide and a tire-size guide) agree that every Silverado 1500 generation since the 1999 model year uses the same 6x139.7 mm (6x5.5 inch) bolt pattern, a 78.1 mm center bore, and M14x1.5 wheel studs. This covers GMT800 (1999-2006), GMT900 (2007-2013), K2XX (2014-2018) and the current T1XX (2019-present). This does NOT apply to the heavier-duty Silverado 2500HD/3500HD, which use an 8-lug pattern.
Wheel sizes by generation
Factory wheel diameters grew over time as trims were added. Early GMT800/GMT900 trucks typically shipped on 16 to 18 inch steel or alloy wheels depending on trim, while later K2XX and T1XX trucks span 17 to 24 inch factory wheels on top trims like High Country. Exact width and offset vary by trim and options package, so always match a replacement wheel to the size stamped on your original wheel or listed on your tire placard.
Tire sizes
Because tire size depends heavily on trim, cab configuration, and whether the truck has the off-road (Z71/Trail Boss) suspension package, there is no single correct tire size for the model line. Common OEM tire sizes across the generations have included sizes such as 245/75R16, 265/70R17, 275/65R18 and 275/55R20, but you should always confirm the exact size for your specific truck rather than assume.
Where to confirm your exact specs
Bolt pattern and center bore rarely change and are not on the door placard, but tire size, load rating, and inflation pressure are. Always check:
- The tire and loading placard on the driver's door jamb (tire size and pressure)
- The owner's manual (wheel and tire specifications, torque)
- The markings stamped into the back of your current wheel (bolt pattern, offset)
- A GM dealer parts department or the GM towing/trailering guide for your exact trim
| Generation / years | Bolt pattern | Centre bore | Stud thread | Stock wheel sizes | Common tire sizes |
|---|---|---|---|---|---|
| GMT800 (1999-2006) | 6x139.7 mm (6x5.5 in) | 78.1 mm | M14x1.5 | 16-17 in | 245/75R16, 265/70R17 (trim dependent) |
| GMT900 (2007-2013) | 6x139.7 mm (6x5.5 in) | 78.1 mm | M14x1.5 | 17-20 in | 245/70R17, 265/65R18, 275/55R20 (trim dependent) |
| K2XX (2014-2018) | 6x139.7 mm (6x5.5 in) | 78.1 mm | M14x1.5 | 17-22 in | 255/70R17, 265/65R18, 275/55R20 (trim dependent) |
| T1XX (2019-present) | 6x139.7 mm (6x5.5 in) | 78.1 mm | M14x1.5 | 17-24 in | 255/70R17, 265/65R18, 275/60R20 (trim dependent) |
Summary
| Bolt pattern | 6x139.7 mm (6x5.5 in) - all generations 1999-present |
|---|---|
| Centre bore | 78.1 mm |
| Stud thread | M14x1.5 |
| Wheel diameter range | 16-24 in depending on generation and trim |
| Applies to | Silverado 1500 only, not 2500HD/3500HD (8-lug) |
| Confirm on your truck | Door placard, owner's manual, current wheel markings |
Full diagnostics
For the complete step-by-step diagnostic and repair guide, see Chevrolet Silverado 1500: Common Problems, Fault Codes & Repairs.
Frequently asked questions
Is the bolt pattern the same on every Silverado 1500 generation?
Yes - independent fitment guides agree that 6x139.7 mm (6x5.5 inch) has been used on the Silverado 1500 since the 1999 GMT800 through the current T1XX truck. This applies to the 1500 half-ton only; the 2500HD and 3500HD use a different 8-lug pattern, so do not cross-shop wheels between a 1500 and an HD truck.
What is the centre bore and stud thread on a Silverado 1500?
Fitment references list a 78.1 mm centre bore and M14x1.5 wheel studs across Silverado 1500 generations. If you are fitting aftermarket wheels with a different centre bore, use a hub-centric ring to avoid vibration.
What size wheels came on my Silverado 1500?
It depends heavily on trim and model year: early trucks (1999-2006) typically ran 16-17 inch wheels, while modern High Country and RST trims can run up to 22-24 inch wheels. Check the size stamped on your current wheel or your owner's manual to be sure.
Where do I find the exact tire size for my truck?
Open the driver's door - the tire and loading information placard on the door jamb lists the exact factory tire size and recommended cold inflation pressure for your specific truck, which is more reliable than any general guide.