Recorded OEM specifications for the 2021 GMC Sierra 1500, donor years with overlapping ranges, and a calculator to compare a selected wheel. Range overlap is not a guaranteed fit.
Baseline mounting dimensions used for interchange decisions.
Multiple OEM configurations exist for this vehicle. Fitment can vary by trim, brakes, and factory wheel package – confirm your exact setup before buying.
Thread-only product links are shopping examples, not verified fits. Seat style is not confirmed here. As an Amazon Associate we earn from qualifying purchases.
These are vehicle-year records whose recorded OEM ranges overlap this 2021 GMC Sierra 1500. Overlap is not a guarantee that a specific wheel will install. Selected-wheel comparison is in the calculator below.
Evaluated 56 donor years. Listed 24 eligible overlaps (not all evaluated years are compatible). Showing all listed.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Approximate position vs the mid OEM package: outer change -0.17 mm, inner change -6.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Approximate position vs the mid OEM package: outer change -0.17 mm, inner change -6.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
Approximate position vs the mid OEM package: outer change -1.17 mm, inner change -5.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Approximate position vs the mid OEM package: outer change 4.18 mm, inner change 2.18 mm. This uses aggregated width/offset ranges, not a specific wheel.
Only years with evidence-based interchange relationships are listed. Adjacent years are not assumed compatible.
Compare a donor vehicle or custom wheel against this 2021 GMC Sierra 1500. Use Compare in calculator on a donor row above to fill the donor side of this same calculator.
Compare wheel compatibility between two vehicles
2021 GMC Sierra 1500
Example products matched to recorded thread, hub, or spacer dimensions. They are not verified fits. Confirm seat style, thickness, and clearance before ordering.
M14 x 1.5
M14 x 1.5 · Thread match only; seat style is not verified
View on Amazon →
M14 x 1.5 · Thread match only; seat style is not verified
View on Amazon →
M14 x 1.5 · Thread match only; seat style is not verified
View on Amazon →As an Amazon Associate we earn from qualifying purchases. Product availability and pricing may change.
The specifications below are the known fitment values provided for the 2021 GMC Sierra 1500. Actual equipment can vary by trim, package, drivetrain, brake package, and production configuration. Confirm the specifications for your specific truck with the door-jamb label, owner’s manual, wheel markings, VIN-based OEM parts information, or a GMC dealer before purchasing wheels or tires.
| Specification | Provided value | Important note |
|---|---|---|
| Bolt pattern | 6x139.7 | Six studs on a 139.7 mm pitch circle diameter |
| Center bore | 78.1 mm | Confirm that an aftermarket wheel is correctly hub-centered or uses an appropriate hub-centric solution |
| Thread size | M14 x 1.5 | Use lug nuts with the correct thread, seat type, and wheel compatibility |
| Rim diameter | 20 inches | Provided value; trim and brake clearance must be confirmed |
| Rim width | 9.0 inches | Provided value |
| Wheel offset | ET28 | Positive offset of 28 mm, based on the provided specification |
| Backspacing | 5.6 inches | Provided value; compare this with replacement-wheel backspacing |
| Tire section width | 255 mm | Nominal section width; actual measured width varies by tire model and approved rim width |
| Tire aspect ratio | 70% | Provided value |
| Tire rim diameter | 17 inches | This differs from the provided 20-inch rim diameter, so do not treat these values as one confirmed wheel-and-tire package |
The supplied tire fields describe a nominal 255/70R17 tire, while the supplied rim diameter is 20 inches. Because the data may represent different configurations or partial OEM records, verify the exact tire size and wheel size on your truck before ordering. Do not infer a factory combination from the table alone.
Use the calculator to compare a donor vehicle’s wheel specifications with the wheels you plan to install on your 2021 GMC Sierra 1500.
The calculator is a comparison tool, not a substitute for a physical test fit or OEM confirmation. If a specification is unknown or differs between sources, use the wheel stamp, tire sidewall, VIN-based parts information, or a qualified tire and wheel professional to confirm it.
Plus sizing changes the wheel diameter while maintaining a tire diameter that is reasonably close to the original setup. A larger wheel may improve steering response or appearance, but it usually leaves less sidewall to absorb impacts. A smaller wheel may provide more sidewall, but brake clearance must be verified.
There is not enough information provided here to recommend a specific alternate wheel or tire size for every 2021 GMC Sierra 1500 trim. Use the calculator to compare custom wheel diameter, width, and offset, then confirm the result against the tire manufacturer’s approved rim-width range and GMC documentation.
When comparing sizes, pay attention to overall tire diameter, section width, load index, speed rating, fender clearance, suspension clearance, and speedometer or driver-assistance effects. Do not select a tire solely because its nominal diameter appears similar.
Basic wheel installation requires a safe lifting method, properly rated jack stands, a lug socket, and a calibrated torque wrench. A tread-depth gauge and accurate tire-pressure gauge are also useful for inspection and maintenance.
Shop automotive torque wrenches on Amazon
Shop digital tire pressure gauges on Amazon
Use jack stands on a firm, level surface and follow the vehicle owner’s lifting points. Never work under a vehicle supported only by a jack.
What is the bolt pattern listed for the 2021 GMC Sierra 1500?
The provided bolt pattern is 6x139.7. Verify the wheel’s bolt-hole pattern before purchase because a similar-looking wheel with a different pattern is not safe to install.
What center bore is provided for this truck?
The provided center bore is 78.1 mm. An aftermarket wheel should fit the hub correctly or use a properly sized hub-centric solution when appropriate. A center bore that is too small will not fit over the hub.
What lug thread size is listed?
The provided thread size is M14 x 1.5. The thread size does not confirm the correct lug nut seat, so match the lug nut design to the wheel and follow OEM or wheel-maker instructions.
Can I use any 6x139.7 wheel on a 2021 GMC Sierra 1500?
No. Bolt pattern is only one fitment requirement. You must also verify center bore, wheel width, offset, backspacing, brake clearance, lug hardware, load rating, and tire compatibility.
Why do the provided wheel and tire diameters differ?
The supplied wheel diameter is 20 inches, while the supplied tire rim diameter is 17 inches. These values should not be assumed to describe one matching package. Confirm the actual wheel and tire sizes on your vehicle and check the calculator using verified values.
What wheel size should I choose for a plus-size setup?
No universal alternate size can be confirmed from the supplied information. Enter the proposed diameter, width, and offset in the calculator, then verify tire approval, load rating, brake clearance, and physical clearance for your specific trim.
Do I need hub rings?
It depends on the replacement wheel’s center bore. A larger bore may require a correctly sized hub ring for proper centering, while a smaller bore will not fit. Follow the wheel manufacturer’s instructions and do not use rings to correct an incorrect bolt pattern.
How can I confirm the original wheel and tire size?
Check the tire sidewall, wheel markings, driver-door or door-jamb information label, owner’s manual, VIN-based OEM parts information, and a GMC dealer. Compare those findings with the calculator before ordering.
Wheel interchange depends on more than bolt pattern. Where data is available, this site compares recorded OEM values:
A normal wheel spacer does not change bolt pattern. Hub rings cannot enlarge a wheel bore that is smaller than the hub. Brake clearance and tire package fitment still require vehicle-specific checks when not confirmed in the dataset.
