Ram Heavy Duty Bolt Pattern, Center Bore & Wheel Offset (2013–2025)
Ram Heavy Duty wheel fitment: 8x165.1 bolt pattern, 121.3mm center bore (2013–2025). OE wheel sizes and offsets for every Heavy Duty variant we cover (4 guide
- 8x165.1bolt pattern (PCD)
- 121.3 mmcenter bore
- M14x1.5 Nutwheel bolt / nut
- 4 guidesmodel years 2013–2025
Ram Heavy Duty wheel specs by year and trim
| Year | Model / trim | Bolt pattern | Center bore | OE wheel |
|---|---|---|---|---|
| 2025 | Ram Heavy Duty | 8x165.1 | 121.3 mm | 18x8.0J |
| 2019 | Ram Heavy Duty | 8x165.1 | 121.3 mm | 18x8.0J |
| 2014 | Ram Heavy Duty | 8x165.1 | 121.3 mm | 18x8.0J |
| 2013 | Ram Heavy Duty | 8x165.1 | 121.3 mm | 18x8.0J |
Factory wheel sizes on the Ram Heavy Duty
Across the 4 Ram Heavy Duty trims with a documented factory wheel, the OE diameter is 18 inch, width 8J. A forged wheel that keeps the 8x165.1 bolt pattern and the 121.3 mm hub bore and matches the factory offset listed on the model page bolts on without spacers or hub rings. Going one inch up in diameter with a lower-profile tyre keeps the rolling circumference inside the usual 1.5% tolerance; every extra 0.5J of width moves the outer lip about 6 mm outward at the same offset, and each 5 mm less offset moves the whole wheel 5 mm outward.
Forged wheels for the Ram Heavy Duty (8x165.1)
Shop all Ram Heavy Duty forged wheels →
Get a quote for Ram Heavy Duty wheels
Vehicles With the Same Hub as the Ram Heavy Duty (8x165.1, 121.3 mm Bore)
In our database, 2 other Dodge entries use exactly the same 8x165.1 bolt pattern and 121.3 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.
8x165.1 is used by 0.4% of the vehicle entries in our database (29 of 6,503); 27.6% of those also use a 121.3 mm center bore.
Offset and Backspacing: Factory Wheel vs Options
Backspacing ≈ width/2 + ET/25.4 + 0.5 in. "Inward" means closer to the suspension; "outward" means closer to the fender lip.
| Setup | Size | ET | Backspacing | Inward vs OE | Outward vs OE |
|---|---|---|---|---|---|
| Factory (OE) | 18x8J | ET42 | 6.15 in (156 mm) | — | — |
| Flush | 18x9J | ET18 | 5.71 in (145 mm) | −11 mm | +37 mm |
| Maximum | 20x10J | ET0 | 5.50 in (140 mm) | −17 mm | +67 mm |
Hub-Centric Rings for a 121.3 mm Center Bore
A wheel with a center bore larger than 121.3 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 130.1 mm | 130.1 → 121.3 mm |
ANKUSI forged wheels are bored to exactly 121.3 mm for this vehicle, so no ring is needed.
Sources and Last Update
Bolt pattern and center bore were checked against at least two independent fitment references before publication.
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.
FAQ
What is the bolt pattern on a Ram Heavy Duty?
The Ram Heavy Duty uses a 8x165.1 bolt pattern with a 121.3mm center bore across every Heavy Duty variant in our database (4 guides, 2013–2025).
What is the Ram Heavy Duty center bore?
The hub-centric center bore is 121.3 mm. Aftermarket wheels should match this bore or use hub-centric rings so the hub, not the bolts, carries the load.
Do all Ram Heavy Duty years share the same wheel fitment?
The bolt pattern and center bore are the same across the years we cover, but OE wheel width and offset differ by trim, so check the exact model line before choosing an aftermarket size.
Which forged wheels fit the Ram Heavy Duty?
Any wheel drilled 8x165.1 with a 121.3mm hub bore in the offset range shown on the model guide. ANKUSI forges wheels to order for this exact specification, in 14–24 inch diameters, so no adapters or hub rings are needed.