BBS-Style Gold Mesh Polished Lip Forged Wheels
Monoblock · Gold
1980 BMW 3-Series E21 Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting BMW 3-Series E21 wheels? This page gives the 1980 BMW 3-Series E21 bolt pattern (4x100), centre bore, factory rim size and the offset range for aftermarket and forged BMW 3-Series E21 rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 1980 BMW 3-Series E21 uses a 4x100 bolt pattern with a 57.1 mm centre bore and M12x1.5 lug bolts. Factory wheels: 13x5.5J, front and rear. For aftermarket wheels, 15x7.0J ET12 sits flush and 15x8.0J ET0 is the most aggressive fit.
Forged wheels for the 1980 BMW 3-Series E21 — drilled 4x100 with a 57.1 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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BMW 3-Series E21 (1980): 4x100 bolt pattern, 57.1mm center bore. Factory wheels: 13x5.5J F/R. Reference fitment ranges.
Bolt Pattern4x100
Wheel Bolt/NutM12x1.5 Bolt
Center Bore57.1mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year1980
CategorySedan/Cpe
✓ 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) | 13x5.5J F/R |
| Flush Fitment | 15x7.0J at ET12 offset |
| Maximum Aggressive | 15x8.0J at ET0 offset |
Forged Wheel Designs for the BMW 3-Series E21
Every design below is forged to order, so it can be machined to the BMW 3-Series E21's 4x100 bolt pattern and 57.1 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
On a performance-oriented coupe, the wheel is one of the few components where shaving weight has a compounding effect — less rotational mass means less work for the brakes, the drivetrain, and the chassis on every input. A forged wheel gets there without compromising the strength margin the factory engineered in.
The BMW 3-Series E21 runs a 4x100 bolt pattern, 57.1mm center bore, and a 13x5.5J, front and rear, wheel from the factory. Our Flush Fitment reference is 15x7.0J ET12, which tucks the tire under the fender lip on a stock-height BMW 3-Series E21. Our Maximum Aggressive reference is 15x8.0J ET0 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
BMW 3-Series OE Wheel Specs
The 1980 BMW 3-Series E21 (Sedan/Cpe) uses a 4x100 bolt pattern with a 57.1mm center bore. Factory wheels are 13x5.5J F/R.
Why the factory spec works for most owners:
- Balances ride comfort with everyday fuel efficiency
- A widely used size in this segment, so tire and wheel availability stays strong
- Keeps unsprung weight low for stable, predictable handling
- Maintains clearance for the factory brake calipers and suspension components
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the BMW 3-Series E21 (1980) we drill the 4x100 pattern and cut the centre bore to 57.1mm 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: 13x5.5J ET18 → ~3.96″ backspacing
- Flush: 15x7.0J ET12 → ~4.47″ backspacing
- Max: 15x8.0J ET0 → ~4.5″ backspacing
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 BMW spec, or want a wheel built to a custom offset for your BMW 3-Series E21? 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 BMW 3-Series E21 (4x100, 57.1 mm Bore)
In our database, 37 other vehicle entries from 7 makes use exactly the same 4x100 bolt pattern and 57.1 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.
4x100 is used by 6.9% of the vehicle pages in our English fitment guide (451 of 6,503); 8.4% of those also use a 57.1 mm center bore.
Hub-Centric Rings for a 57.1 mm Center Bore
A wheel with a center bore larger than 57.1 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 60.1 mm | 60.1 → 57.1 mm |
| 63.4 mm | 63.4 → 57.1 mm |
| 64.1 mm | 64.1 → 57.1 mm |
| 65.1 mm | 65.1 → 57.1 mm |
| 73.1 mm | 73.1 → 57.1 mm |
ANKUSI forged wheels are bored to exactly 57.1 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the BMW 3-Series E21 use?
The 1980 BMW 3-Series E21 uses a 4x100 bolt pattern.
How many lug bolts does the BMW 3-Series E21 use?
The BMW 3-Series E21 uses a 4-lug bolt pattern (4x100), so you need a 4-lug forged wheel to bolt straight on.
What is the center bore size on the BMW 3-Series E21?
The BMW 3-Series E21's center bore is 57.1mm. 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 BMW 3-Series E21?
Factory wheels on the BMW 3-Series E21 are 13x5.5J F/R.
What is the biggest wheel size I can fit on my BMW 3-Series E21 without rubbing?
The most aggressive fitment we recommend without fender work is 15x8.0J 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 BMW 3-Series E21?
For a flush look with minimal to no rubbing, we recommend 15x7.0J at ET12 offset as a starting point on a stock or mildly lowered BMW 3-Series E21.
Do I need wheel spacers for my BMW 3-Series E21?
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 BMW 3-Series E21?
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 4.47" 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 BMW 3-Series E21?
The BMW 3-Series E21 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: M14x1.25, 60-degree conical-seat lug bolt.
Factory Torque Spec: 140 Nm (103 ft-lb). Consistent across modern BMW passenger and X-series models using factory conical-seat bolts.
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).
Other cars on the same factory size: 13x5.5 wheels · 13 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.