20×? ET1
Documented on a 2011 GMC Sierra 1500 build — observed custom fitment, not a universal fit guarantee.
- Tires
- 305/55R20
Compared with OEM
Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.
2011 GMC Sierra 1500 Wheel Offset
Quick specs
- Wheel size
- Multiple — see configurations
- Backspacing
- Multiple — see configurations
- Bolt pattern
- 6×139.7
- Center bore
- 78.1 mm
- Thread
- M14×1.5
- Tire size
- Multiple — see configurations
OEM configurations
| Configuration | Front | Rear | Offset | Backspacing | Tire | Bolt pattern | Center bore | Thread |
|---|---|---|---|---|---|---|---|---|
| 4.3i · 4.3L, LU3, V6, Petrol | 7.5x17 | — | ET31 | 4.97 in | 245/70R17 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 4.3i · 4.3L, LU3, V6, Petrol | 7.5x17 | — | ET31 | 4.97 in | 265/70R17 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 4.3i · 4.3L, LU3, V6, Petrol | 8x18 | — | ET31 | 5.22 in | 265/65R18 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 4.3i · 4.3L, LU3, V6, Petrol | 8.5x20 | 10.5x20 | ET31 / ET35 | 5.47 in | 275/55R20 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 4.8i · 4.8L, L20, V8, Petrol | 7.5x17 | — | ET31 | 4.97 in | 245/70R17 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 4.8i · 4.8L, L20, V8, Petrol | 7.5x17 | — | ET31 | 4.97 in | 265/70R17 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 4.8i · 4.8L, L20, V8, Petrol | 8x18 | — | ET31 | 5.22 in | 265/65R18 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 4.8i · 4.8L, L20, V8, Petrol | 8.5x20 | 10.5x20 | ET31 / ET35 | 5.47 in | 275/55R20 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 5.3i · 5.3L, LMG/LC9, V8, Flex-Fuel | 7x17 | — | ET21 | 4.33 in | 265/80R17 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 5.3i · 5.3L, LMG/LC9, V8, Flex-Fuel | 6.5x16 | — | ET41 | 4.86 in | 265/70R16 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 5.3i · 5.3L, LMG/LC9, V8, Flex-Fuel | 8x18 | — | ET26 | 5.02 in | 265/75R18 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 5.3i · 5.3L, LMG/LC9, V8, Flex-Fuel | 9.5x20 | — | ET41 | 6.36 in | 285/65R20 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 6.2i · 6.2L, L9H, V8, Flex-Fuel | 7.5x16 | — | ET36 | 5.17 in | 265/70R16 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 6.2i · 6.2L, L9H, V8, Flex-Fuel | 6.5x17 | — | ET41 | 4.86 in | 245/60R17 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 6.2i · 6.2L, L9H, V8, Flex-Fuel | 8x19 | 8.5x19 | ET36 / ET47 | 5.42 in | 265/65R19 | 6x139.7 | 78.1 mm | M14 x 1.5 |
| 6.2i · 6.2L, L9H, V8, Flex-Fuel | 7.5x19 | — | ET21 | 4.58 in | 295/65R19 | 6x139.7 | 78.1 mm | M14 x 1.5 |
Wheels and hardware
More on AmazonLug hardware
More on Amazon
Wheel Accessories Parts Set of 24 Black Spiked Solid Metal Lug Nuts M14x1.5 Thread 4.4 Inch Tall Closed End Bulge Acorn Spike Lug Nut 1 Socket Key- Fit Chevy Silverado 1500 Ford F150 GMC Sierra 1500
Confirmed vehicle catalog match. Confirm seat type for your wheel.
Check price on Amazon
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.
Check price on Amazon
Wheel Accessories Parts Bulge Acorn Set of 24 Aftermarket Lug Nuts M14 X 1.50 Thread 1.90" Long for Trucks 19mm(3/4") Hex 14x1.5 Wheel Lug Nuts (24 M14x1.50, Chrome)
Confirmed vehicle catalog match. Confirm seat type for your wheel.
Check price on Amazon
Wheel locks
More on AmazonReal-World 2011 GMC Sierra 1500 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:
- 17-inch — 2 documented builds
- 20-inch — 2 documented builds
4 documented builds.
20×14 ET-76
Documented on a 2011 GMC Sierra 1500 build — observed custom fitment, not a universal fit guarantee.
- Tires
- 35/12.5R20
- Suspension
- Suspension Lift 7.5"
Compared with OEM
Compared with the 20×8.5 ET31 OEM configuration. Calculated geometry only — not fit confirmation.
- Outer edge 176.8 mm farther toward fender (more outward poke)
- Inner edge 37.2 mm farther from suspension (more inner clearance)
- Width +5.5" vs OEM
17×9 ET-6
Documented on a 2011 GMC Sierra 1500 build — observed custom fitment, not a universal fit guarantee.
- Tires
- 285/70R17
- Suspension
- Suspension Lift 3.5"
Compared with OEM
Compared with the 17×6.5 ET41 OEM configuration. Calculated geometry only — not fit confirmation.
- Outer edge 78.8 mm farther toward fender (more outward poke)
- Inner edge 15.3 mm farther from suspension (more inner clearance)
- Width +2.5" vs OEM
17×8.5
Documented on a 2011 GMC Sierra 1500 build — observed custom fitment, not a universal fit guarantee.
- Tires
- 295/70R17
- Suspension
- Leveling Kit
Compared with OEM
Compared with the 17×6.5 ET41 OEM configuration. Calculated geometry only — not fit confirmation.
Compare your own setup
See how a different width or offset sits versus an OEM configuration for this year.
More specs for the 2011 GMC Sierra 1500
Each OEM row is a catalog configuration. Offset ranges are not collapsed when the database has exact setups. Documented aftermarket builds are observed setups only — not universal fit or clearance confirmation.