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1971 Oldsmobile 442 Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Oldsmobile 442 wheels? This page gives the 1971 Oldsmobile 442 bolt pattern (5x120.65), centre bore, factory rim size and the offset range for aftermarket and forged Oldsmobile 442 rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 1971 Oldsmobile 442 uses a 5x120.65 bolt pattern with a 70.3 mm centre bore and M12x1.5 lug nuts. Factory wheels: 14x7J ET0. For aftermarket wheels, 17x8J ET0 front / 17x9J ET-5 rear sits flush.
Forged wheels for the 1971 Oldsmobile 442 — drilled 5x120.65 with a 70.3 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Oldsmobile 442 (1971): 5x120.65 bolt pattern, 70.3mm center bore, OE 14x7J ET0. Forged wheel fitment specs from ANKUSI.
Bolt Pattern5x120.65
Wheel Bolt/NutM12x1.5 Nut
Center Bore70.3mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year1971
Category5-Lug Standard Sedan
Data check: the bolt pattern and center bore on this page have not yet been confirmed by a second independent source. Measure your hub or ask us before ordering. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 14x7J ET0 |
| Flush Fitment | F 17x8J ET0 / R 17x9J ET-5 |
Forged Wheel Designs for the Oldsmobile 442
Every design below is forged to order, so it can be machined to the Oldsmobile 442's 5x120.65 bolt pattern and 70.3 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
A sedan's wheel spec is a balance point the factory tuned between ride comfort, steering feel, and everyday durability. Forging lets us hold that same structural margin while cutting rotational mass, which is where most of the real-world benefit — quicker steering response, marginally better ride — actually comes from.
The Oldsmobile 442 ships from the factory on a 5x120.65 bolt pattern with a 70.3mm center bore and a 14x7J ET0 wheel. Our flush reference for the Oldsmobile 442 is F 17x8J ET0 / R 17x9J ET-5.; our maximum aggressive reference is F 18x8.5J ET-5 / R 18x10J ET-12. — beyond that, expect clearance issues against the fender liner without further modification.
Oldsmobile 442 OE Wheel Specs
The Oldsmobile 442 ships from the factory on 5x120.65 bolt pattern wheels with a 70.3mm center bore. The stock wheel size is 14x7J ET0, offering a balanced ride that suits most owners without any rubbing or clearance concerns.
Why the factory spec works for most owners:
- Balances ride comfort with steering response and highway efficiency.
- Wide tire and wheel availability at the factory diameter keeps replacement costs low.
- Lower unsprung weight than larger aftermarket wheels helps ride quality and acceleration.
- Guaranteed clearance against brake calipers and suspension components.
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Oldsmobile 442 (1971) we drill the 5x120.65 pattern and cut the centre bore to 70.3mm 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 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) | 14x7J | ET0 | 4.00 in (102 mm) | — | — |
| Flush | 17x8J | ET0 | 4.50 in (114 mm) | +13 mm | +13 mm |
| Maximum | 18x8.5J | ET-5 | 4.55 in (116 mm) | +14 mm | +24 mm |
Vehicles With the Same Hub as the Oldsmobile 442 (5x120.65, 70.3 mm Bore)
In our database, 63 other vehicle entries from 6 makes use exactly the same 5x120.65 bolt pattern and 70.3 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.
5x120.65 is used by 1.6% of the vehicle pages in our English fitment guide (101 of 6,503); 63.4% of those also use a 70.3 mm center bore.
Hub-Centric Rings for a 70.3 mm Center Bore
A wheel with a center bore larger than 70.3 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 70.5 mm | 70.5 → 70.3 mm |
| 71.6 mm | 71.6 → 70.3 mm |
| 72.6 mm | 72.6 → 70.3 mm |
| 73.1 mm | 73.1 → 70.3 mm |
ANKUSI forged wheels are bored to exactly 70.3 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Oldsmobile 442 use?
The 1971 Oldsmobile 442 uses a 5x120.65 bolt pattern.
How many lug bolts does the Oldsmobile 442 use?
The Oldsmobile 442 uses a 5-lug bolt pattern (5x120.65), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Oldsmobile 442?
The Oldsmobile 442's center bore is 70.3mm. 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 Oldsmobile 442?
Factory wheels on the Oldsmobile 442 are 14x7J ET0.
What does a flush wheel fitment look like on the Oldsmobile 442?
For a flush look with minimal to no rubbing, we recommend F 17x8J ET0 / R 17x9J ET-5 as a starting point on a stock or mildly lowered Oldsmobile 442.
Do I need wheel spacers for my Oldsmobile 442?
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 Oldsmobile 442?
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 4.5" backspacing up front and 4.8" in the rear.
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 Oldsmobile 442?
Yes — the Oldsmobile 442's factory and our recommended flush/max fitments already use staggered sizing (different width front and rear), and ANKUSI can forge matching staggered sets to your target offsets.
Sources and Last Update
Data checked against: avtoreference.com, tirewheelguide.com.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Other cars on the same factory size: 14 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.
Bolt pattern and center bore on this page come from published fitment references and are still awaiting a second independent check. Last reviewed 2026-09-18. Spotted an error? Email info@ankusi.com and we will verify and correct it.