20×?
Documented on a 2007 GMC Sierra 2500HD build — observed custom fitment, not a universal fit guarantee.
- Tires
- 275/55R20
Compared with OEM
Compared with the 20×8 ET24 OEM configuration. Calculated geometry only — not fit confirmation.
2007 GMC Sierra 2500HD Wheel Offset
ET24 · ET20
Quick specs
- OEM offset
- ET24 · ET20
- Wheel size
- 8x20 · 8.5x20 · 9x20
- Backspacing
- 4.94 in · 5.04 in · 5.29 in
- Tire size
- 265/60R20 · 275/55R20 · 285/50R20
OEM configurations
| Configuration | Rim | Offset | Backspacing | Tire | Bolt pattern | Center bore | Thread |
|---|---|---|---|---|---|---|---|
| 6.0i · V8, Petrol | 8x20 | ET24 | 4.94 in | 265/60R20 | 8x165.1 | 116.7 mm | M14 x 1.5 |
| 6.0i · V8, Petrol | 8.5x20 | ET20 | 5.04 in | 275/55R20 | 8x165.1 | 116.7 mm | M14 x 1.5 |
| 6.0i · V8, Petrol | 9x20 | ET20 | 5.29 in | 285/50R20 | 8x165.1 | 116.7 mm | M14 x 1.5 |
| 6.6TD · V8, Diesel | 8x20 | ET24 | 4.94 in | 265/60R20 | 8x165.1 | 116.7 mm | M14 x 1.5 |
| 6.6TD · V8, Diesel | 8.5x20 | ET20 | 5.04 in | 275/55R20 | 8x165.1 | 116.7 mm | M14 x 1.5 |
| 6.6TD · V8, Diesel | 9x20 | ET20 | 5.29 in | 285/50R20 | 8x165.1 | 116.7 mm | M14 x 1.5 |
See how a different wheel would sit See wheel backspacing
What happens if you change the offset?
Compare your own setup
See how a different width or offset sits versus an OEM configuration for this year.
Wheels and hardware for this vehicle
More on AmazonLug hardware
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M14x1.5 Lug Nuts Black with Spline Tuner, XL 2 inches Length Conical Aftermarket Wheel Nut, Compatible with Chevy GMC Ford Cadillac Lincoln SAAB Saturn Silverado 1500 Savana, Set of 24
Confirmed vehicle catalog match. Confirm seat type for your wheel.
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MIKKUPPA M14x1.5 Wheel Lug Nut - Replacement for Chevy Silverado 1500 2500, GMC, Ford, Ram, Aftermarket Wheel - 32pcs Black Closed End Lug Nuts with 1 Socket Key
Confirmed vehicle catalog match. Confirm seat type for your wheel.
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Dorman 611-236 Wheel Nut M14-1.50 Flattop Nut - 22mm Hex, 44.5mm Length Compatible with Select Models, 10 Pack (OE Fix)
Confirmed vehicle catalog match. Confirm seat type for your wheel.
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Wheel locks
More on AmazonReal-World 2007 GMC Sierra 2500HD Wheel Setups
Observed aftermarket setups from documented Modified1 builds. These are individual build records — not OEM specifications and not clearance guarantees for every vehicle.
Common custom wheel sizes
Among builds in our database for this model year:
- 20-inch — 1 documented build
1 documented build.
More specs for the 2007 GMC Sierra 2500HD
OEM offsets are catalog configurations, not an aftermarket “safe ET range.” Matching offset alone does not confirm clearance. Documented custom builds are observed setups only.