WheelOffset

2012 GMC Sierra 2500HD Wheel Offset

ET40 · ET35

Quick specs

OEM offset
ET40 · ET35
Wheel size
8.5x20 · 9x20 · 9x22
Backspacing
5.82 in · 5.88 in
Bolt pattern
8×180
Center bore
124.1 mm
Tire size
275/55R20 · 285/50R20 · 285/45R22

OEM configurations

ConfigurationRimOffsetBackspacingTireBolt patternCenter boreThread
6.0i · V8, Petrol8.5x20ET405.82 in275/55R208x180124.1 mmM14 x 1.5
6.0i · V8, Petrol9x20ET355.88 in285/50R208x180124.1 mmM14 x 1.5
6.0i · V8, Petrol9x22ET355.88 in285/45R228x180124.1 mmM14 x 1.5
6.6TD · V8, Diesel8.5x20ET405.82 in275/55R208x180124.1 mmM14 x 1.5
6.6TD · V8, Diesel9x20ET355.88 in285/50R208x180124.1 mmM14 x 1.5
6.6TD · V8, Diesel9x22ET355.88 in285/45R228x180124.1 mmM14 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.

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Wheels and hardware for this vehicle

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Lug hardware

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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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  • White Knight 1309-1S-20AM Chrome M14x1.50 Open-End Bulge Acorn Lug Nut, 20 Pack

    Confirmed vehicle catalog match. Confirm seat type for your wheel.

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Wheel locks

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Real-World 2012 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.

2012 GMC Sierra 2500HD custom wheel setup

Staggered · 20×? / Rear unknown

Documented on a 2012 GMC Sierra 2500HD build — observed custom fitment, not a universal fit guarantee.

Wheel: Hostile Havoc-8

Front
20×?
Rear
—
Compared with OEM

Compared with the 20×8.5 ET40 OEM configuration. Calculated geometry only — not fit confirmation.

    View full build on Modified1

    More specs for the 2012 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.