Recorded OEM specifications for the 1999 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 1999 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 13.52 mm, inner change 5.52 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 11.52 mm, inner change 7.52 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 1999 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
1999 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 following values are the known OEM fitment data available for the 1999 GMC Sierra 1500. Specifications can vary by trim, package, drivetrain, brake configuration, or replacement wheel, so confirm the information on your truck and with an OEM source before buying.
| Specification | Known value |
|---|---|
| Bolt pattern | 6x139.7, also written as 6x5.5 |
| Center bore | 78.1 mm |
| Thread size | M12 x 1.5 |
| Rim diameter | 16 inches |
| Rim width | 7.0 inches |
| Wheel offset | ET31, or 31 mm |
| Backspacing | 4.72 inches |
| Known tire size | 235/75R16 |
This is a fitment reference, not a guarantee that every 6x139.7 wheel will clear the brakes, suspension, hubs, or bodywork. The center bore must fit the hub correctly. A wheel with a larger center bore may require properly sized hub-centric rings, while a wheel with a smaller bore generally will not seat over the hub.
Use the calculator to compare wheels from a donor vehicle with the wheels installed on your 1999 GMC Sierra 1500. Enter or select the donor vehicle in the “Wheels from” field and your GMC in the “Installed on” field. Review bolt pattern, center bore, wheel width, diameter, offset, and tire dimensions together rather than relying on one matching value.
The calculator also allows a custom wheel size. Adjust rim diameter, rim width, and offset to model an aftermarket wheel. You can enter a custom tire section width and aspect ratio as well. When rim diameter changes, the calculator updates the tire diameter in the comparison, helping you evaluate overall size differences.
A calculator result is a screening tool, not a substitute for a physical test fit. Confirm brake clearance, hub seating, lug engagement, fender clearance, and suspension clearance before driving.
Confirm the complete wheel and tire combination using the following checks:
Plus sizing means increasing wheel diameter while reducing tire sidewall height to maintain a similar overall tire diameter. It can change steering response, ride comfort, impact resistance, gearing, speedometer behavior, and available load capacity.
Use the calculator to compare a proposed custom wheel and tire against the known 235/75R16 reference. Review section width, aspect ratio, calculated overall diameter, wheel width, and offset. A tire that is only slightly different in diameter can still be too wide for the wheel well or may have insufficient clearance at full lock.
Do not assume that a larger diameter wheel is an upgrade for every truck. Any change must preserve adequate load capacity and clearance. If the calculator does not show a value for a specific trim or configuration, confirm it from the door-jamb label, the original wheel markings, the owner’s manual, and an OEM or reputable wheel manufacturer source.
Inspect the hub face and wheel mounting surface before installation. Remove rust, dirt, paint buildup, and debris that could prevent the wheel from seating flat. Never use spacers, adapters, or altered lug hardware unless they are specifically designed and rated for the application.
Install the correct M12 x 1.5 lug nuts with the seat style required by the wheel. Start every lug nut by hand to avoid cross-threading. Tighten in a star or crisscross pattern, then torque the lugs to the vehicle or wheel manufacturer’s specified value using a calibrated torque wrench. Do not substitute an unverified torque value.
After installation, rotate each wheel by hand if practical and inspect for contact. Lower the vehicle, recheck torque according to the manufacturer’s service procedure, and inspect again after a short drive. Stop immediately if there is vibration, rubbing, steering change, or loosening.
A calibrated torque wrench, correct socket, jack and properly rated jack stands, wheel chocks, a tire-pressure gauge, and a wire brush or suitable hub-cleaning tool are useful for a careful installation. A tread-depth gauge and inspection light can also help evaluate used tires and clearance.
Shop automotive torque wrenches on Amazon
Shop wheel lug nut socket sets on Amazon
Use jack stands on a firm, level surface and never work under a vehicle supported only by a jack. Follow the jack and stand manufacturers’ instructions.
The known bolt pattern is 6x139.7, commonly written as 6x5.5. Confirm the pattern on the wheel and vehicle before purchase because a visually similar wheel may use different dimensions.
The known center bore is 78.1 mm. A larger-bore wheel may need correctly sized hub-centric rings. A smaller-bore wheel may not fit over the hub and should not be forced.
The known reference wheel is 16x7.0 with ET31 offset and 4.72-inch backspacing. These values may not represent every trim or configuration, so compare them with the original wheel markings and OEM documentation.
The known reference tire size is 235/75R16. Verify the correct tire size, load rating, and inflation information on the vehicle certification label and in the owner’s or service documentation.
No. The bolt pattern is only one part of fitment. Center bore, wheel width, offset, brake clearance, lug seat, thread engagement, wheel load rating, and tire dimensions must also be correct.
Yes. Changing offset moves the wheel and tire inward or outward. That can affect suspension, brake, hub, fender, and liner clearance. Enter the proposed diameter, width, and offset in the calculator, then confirm the result with a physical test fit.
Only if the wheel’s center bore is larger than the hub and the wheel manufacturer permits their use. The ring must match the hub and wheel dimensions precisely. Hub-centric rings do not correct an incorrect bolt pattern, offset, load rating, or brake clearance.
Check the vehicle certification label, original wheel markings, owner’s manual, service information, and the wheel or tire manufacturer’s fitment documentation. If those sources conflict with the calculator, do not buy until the difference is resolved.
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.
