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2006 Chevrolet Silverado Z71 Extended Cab Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Chevrolet Silverado Z71 Extended Cab wheels? This page gives the 2006 Chevrolet Silverado Z71 Extended Cab bolt pattern (6x139.7), centre bore, factory rim size and the offset range for aftermarket and forged Chevrolet Silverado Z71 Extended Cab rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2006 Chevrolet Silverado Z71 Extended Cab uses a 6x139.7 bolt pattern with a 78.1 mm centre bore and M14x1.5 lug nuts. Factory wheels: 17x7.5J, front and rear. For aftermarket wheels, 20x9.0J ET20 sits flush and 22x10.0J ET15 is the most aggressive fit.
Forged wheels for the 2006 Chevrolet Silverado Z71 Extended Cab — drilled 6x139.7 with a 78.1 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Chevrolet Silverado Z71 Extended Cab (2006): 6x139.7 bolt pattern, 78.1mm center bore. OE 17x7.5J ET31 F/R. Reference fitment ranges.
Bolt Pattern6x139.7
Wheel Bolt/NutM14x1.5 Nut
Center Bore78.1mm
Wheel Load Rating1000–1400 kg/wheel (Pickup / Light Truck segment reference)
Year2006
CategoryPickup
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 18, 2026. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 17x7.5J F/R |
| Flush Fitment | 20x9.0J at ET20 offset |
| Maximum Aggressive | 22x10.0J at ET15 offset |
Forged Wheel Designs for the Chevrolet Silverado Z71 Extended Cab
Every design below is forged to order, so it can be machined to the Chevrolet Silverado Z71 Extended Cab's 6x139.7 bolt pattern and 78.1 mm center bore, with the width and offset calculated for your setup.
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How to Read Wheel Offset & Measurements
Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.
ANKUSI Engineering Expert Advice
Trucks live and die on unsprung weight and load capacity — every pound added at the wheel is a pound the suspension has to control over every bump, fully loaded or not. Forging the wheel instead of casting it lets us hold the factory load rating while cutting rotational mass, which pays off directly in ride quality and steering response on a vehicle that spends real time towing or hauling.
The Chevrolet Silverado Z71 Extended Cab runs a 6x139.7 bolt pattern, 78.1mm center bore, and a 17x7.5J, front and rear, wheel from the factory. Our Flush Fitment reference is 20x9.0J ET20, which tucks the tire under the fender lip on a stock-height Chevrolet Silverado Z71 Extended Cab. Our Maximum Aggressive reference is 22x10.0J ET15 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Chevrolet Silverado Z71 Extended Cab OE Wheel Specs
The 2006 Chevrolet Silverado Z71 Extended Cab (Pickup) uses a 6x139.7 bolt pattern with a 78.1mm center bore. Factory wheels are 17x7.5J F/R.
Why the factory spec works for most owners:
- Supports higher payload and towing capacity
- Preserves ground clearance for towing, hauling and light off-road use
- Matches tire sizing commonly available for this class of vehicle
- Maintains clearance for the factory suspension and brake package
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Chevrolet Silverado Z71 Extended Cab (2006) we drill the 6x139.7 pattern and cut the centre bore to 78.1mm on our own CNC line, so the wheel hub-centres on the car with no spacer rings, in whatever diameter, width and offset you specify.
Converting these ET figures to backspacing? Use the wheel offset and backspacing calculator.
The figures on this page are part of our open wheel fitment dataset — 10,093 vehicles, free to download, CC BY 4.0.
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: 17x7.5J ET31 → ~5.47″ backspacing
- Flush: 20x9.0J ET20 → ~5.79″ backspacing
- Max: 22x10.0J ET15 → ~6.09″ backspacing
A Note on Clearance
Final clearance depends on the exact tire model, suspension height, brake package, alignment and vehicle tolerances. A physical test fit is recommended before production.
Want to check a different width or offset before you order? Use our Offset & Backspacing Calculator to solve the numbers yourself, or looking for your exact Chevrolet spec, or want a wheel built to a custom offset for your Chevrolet Silverado Z71 Extended Cab? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Vehicles With the Same Hub as the Chevrolet Silverado Z71 Extended Cab (6x139.7, 78.1 mm Bore)
In our database, 79 other vehicle entries from 6 makes use exactly the same 6x139.7 bolt pattern and 78.1 mm center bore. Factory wheels from these cars bolt on and center on the hub without rings; offset and width still have to be checked.
6x139.7 is used by 4.0% of the vehicle pages in our English fitment guide (258 of 6,503); 31.0% of those also use a 78.1 mm center bore.
Hub-Centric Rings for a 78.1 mm Center Bore
A wheel with a center bore larger than 78.1 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 84.1 mm | 84.1 → 78.1 mm |
| 93.1 mm | 93.1 → 78.1 mm |
| 100.1 mm | 100.1 → 78.1 mm |
| 106.1 mm | 106.1 → 78.1 mm |
ANKUSI forged wheels are bored to exactly 78.1 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Chevrolet Silverado Z71 Extended Cab use?
The 2006 Chevrolet Silverado Z71 Extended Cab uses a 6x139.7 bolt pattern.
How many lug bolts does the Chevrolet Silverado Z71 Extended Cab use?
The Chevrolet Silverado Z71 Extended Cab uses a 6-lug bolt pattern (6x139.7), so you need a 6-lug forged wheel to bolt straight on.
What is the center bore size on the Chevrolet Silverado Z71 Extended Cab?
The Chevrolet Silverado Z71 Extended Cab's center bore is 78.1mm. If an aftermarket wheel has a larger center bore than this, hub-centric rings are recommended so the wheel centers on the hub itself rather than relying on the lug bolts alone.
What size are the factory (stock) wheels on the Chevrolet Silverado Z71 Extended Cab?
Factory wheels on the Chevrolet Silverado Z71 Extended Cab are 17x7.5J F/R.
What is the biggest wheel size I can fit on my Chevrolet Silverado Z71 Extended Cab without rubbing?
The most aggressive fitment we recommend without fender work is 22x10.0J at ET15 offset. Going beyond this typically causes rubbing under compression unless you roll the fenders or add camber correction.
What does a flush wheel fitment look like on the Chevrolet Silverado Z71 Extended Cab?
For a flush look with minimal to no rubbing, we recommend 20x9.0J at ET20 offset as a starting point on a stock or mildly lowered Chevrolet Silverado Z71 Extended Cab.
Do I need wheel spacers for my Chevrolet Silverado Z71 Extended Cab?
No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.
How do I calculate wheel backspacing for my Chevrolet Silverado Z71 Extended Cab?
Backspacing (in inches) = wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance). For example, the flush spec above works out to roughly 5.79" of backspacing.
What's the difference between wheel offset and backspacing?
Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.
Can I run staggered wheels (different sizes front and rear) on my Chevrolet Silverado Z71 Extended Cab?
The Chevrolet Silverado Z71 Extended Cab runs the same wheel size front and rear from the factory, so staggered fitment is not required. ANKUSI can still forge a staggered set (wider rear) on request if you want a more aggressive stance.
Wheel Installation Reference: Torque, Thread & TPMS
Thread & Fastener: M12x1.5 or M14x1.5, conical-seat lug nut.
Factory Torque Spec: 179-190 Nm (132-140 ft-lb). Shared Silverado 1500/Colorado bolt pattern; exact thread and torque depend on generation, confirm for your specific model year.
TPMS: Vehicles built before the 2008 model year were not federally required to carry factory TPMS in the US, though many manufacturers adopted it earlier; verify whether your specific build has TPMS before ordering sensor-compatible wheels.
Tire Pressure: Always set tire pressure to the value on your vehicle's tire placard (driver's doorjamb or glovebox), not the max PSI printed on the tire sidewall — this is trim- and tire-size-specific and stays the same reference point when you switch to a different wheel and tire combination.
Reference data compiled from published OEM service specifications and cross-checked against independent repair sources; always confirm against your owner's manual or door-jamb placard before installation.
Sources and Last Update
Data checked against: avtoreference.com.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.