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2013 Ram Heavy Duty Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Ram Heavy Duty wheels? This page gives the 2013 Ram Heavy Duty bolt pattern (8x165.1), centre bore, factory rim size and the offset range for aftermarket and forged Ram Heavy Duty rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Forged wheels for Ram Heavy Duty — styles, sizes & factory quote →
Ram Heavy Duty (2013): 8x165.1 bolt pattern, 121.3mm center bore. Factory wheels: 18x8.0J at ET42 offset, front and rear. Reference fitment ranges.
Bolt Pattern8x165.1
Wheel Bolt/NutM14x1.5 Nut
Center Bore121.3mm
Wheel Load Rating1400–1650 kg/wheel (Heavy-Duty Truck segment reference)
Year2013
CategoryHD Truck
✓ 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) | 18x8.0J F/R |
| Flush Fitment | 18x9.0J at ET18 offset |
| Maximum Aggressive | 20x10.0J at ET0 offset |
Forged Wheel Designs for the Ram Heavy Duty
Every design below is forged to order, so it can be machined to the Ram Heavy Duty's 8x165.1 bolt pattern and 121.3 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
Payload and towing figures on a truck are engineered around a specific unsprung mass budget at each corner. Forging lets ANKUSI hit the factory strength rating for the Ram Heavy Duty at a lower rotational weight than an equivalent cast wheel, which is the more meaningful upgrade on a work-capable platform than diameter alone.
The Ram Heavy Duty runs a 8x165.1 bolt pattern, 121.3mm center bore, and a 18x8.0J, front and rear, wheel from the factory. Our Flush Fitment reference is 18x9.0J ET18, which tucks the tire under the fender lip on a stock-height Ram Heavy Duty. Our Maximum Aggressive reference is 20x10.0J ET0 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Ram Heavy Duty OE Wheel Specs
The 2013 Ram Heavy Duty (HD Truck) uses a 8x165.1 bolt pattern with a 121.3mm center bore. Factory wheels are 18x8.0J 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 Ram Heavy Duty (2013) we drill the 8x165.1 pattern and cut the centre bore to 121.3mm 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: 18x8.0J ET42 → ~6.15″ backspacing
- Flush: 18x9.0J ET18 → ~5.71″ backspacing
- Max: 20x10.0J ET0 → ~5.5″ 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 Ram spec, or want a wheel built to a custom offset for your Ram Heavy Duty? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Frequently Asked Questions
What bolt pattern (PCD) does the Ram Heavy Duty use?
The 2013 Ram Heavy Duty uses a 8x165.1 bolt pattern.
How many lug bolts does the Ram Heavy Duty use?
The Ram Heavy Duty uses a 8-lug bolt pattern (8x165.1), so you need a 8-lug forged wheel to bolt straight on.
What is the center bore size on the Ram Heavy Duty?
The Ram Heavy Duty's center bore is 121.3mm. 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 Ram Heavy Duty?
Factory wheels on the Ram Heavy Duty are 18x8.0J F/R.
What is the biggest wheel size I can fit on my Ram Heavy Duty without rubbing?
The most aggressive fitment we recommend without fender work is 20x10.0J at ET0 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 Ram Heavy Duty?
For a flush look with minimal to no rubbing, we recommend 18x9.0J at ET18 offset as a starting point on a stock or mildly lowered Ram Heavy Duty.
Do I need wheel spacers for my Ram Heavy Duty?
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 Ram Heavy Duty?
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 5.71" 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 Ram Heavy Duty?
The Ram Heavy Duty 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.