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2018 BMW 5-Series Touring G31 Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting BMW 5-Series Touring G31 wheels? This page gives the 2018 BMW 5-Series Touring G31 bolt pattern (5x112), centre bore, factory rim size and the offset range for aftermarket and forged BMW 5-Series Touring G31 rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
BMW 5-Series Touring G31 (2018): 5x112 bolt pattern, 66.6mm center bore. Factory wheels: F: 18x8.0J R: 18x9.0J. Reference fitment ranges.
Bolt Pattern5x112
Wheel Bolt/NutM14x1.25 Bolt
Center Bore66.6mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year2018
CategoryWagon
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 25, 2026. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 18x8.0J R: 18x9.0J |
| Flush Fitment | F 20x9.0J ET25 / R 20x10.0J ET35 |
| Maximum Aggressive | F 21x9.5J ET20 / R 21x10.5J ET30 |
Forged Wheel Designs for the BMW 5-Series Touring G31
Every design below is forged to order, so it can be machined to the BMW 5-Series Touring G31's 5x112 bolt pattern and 66.6 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 wagon carries wagon-specific weight distribution — more mass over the rear axle when loaded — so wheel strength at the rear corners matters as much as the front. Forging lets us match the factory's strength target on both ends while keeping rotational mass down, which keeps the ride composed whether the cargo area is empty or full.
The BMW 5-Series Touring G31 runs a 5*112 bolt pattern, 66.6mm center bore, and a F: 18x8.0J wheel from the factory. Our Flush Fitment reference is F 20x9.0J ET25 / R 20x10.0J ET35, which tucks the tire under the fender lip on a stock-height BMW 5-Series Touring G31. Our Maximum Aggressive reference is F 21x9.5J ET20 / R 21x10.5J ET30 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
BMW 5-Series Touring OE Wheel Specs
The 2018 BMW 5-Series Touring G31 (Wagon) uses a 5*112 bolt pattern with a 66.6mm center bore. Factory wheels are F: 18x8.0J R: 18x9.0J.
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 5-Series Touring G31 (2018) we drill the 5x112 pattern and cut the centre bore to 66.6mm 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):
- Flush: F 20x9J ET25 → ~5.98″ F backspacing, R 20x10J ET35 → ~6.88″ R backspacing
- Max: F 21x9.5J ET20 → ~6.04″ F backspacing, R 21x10.5J ET30 → ~6.93″ R 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 5-Series Touring G31? 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 BMW 5-Series Touring G31 use?
The 2018 BMW 5-Series Touring G31 uses a 5x112 bolt pattern.
How many lug bolts does the BMW 5-Series Touring G31 use?
The BMW 5-Series Touring G31 uses a 5-lug bolt pattern (5x112), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the BMW 5-Series Touring G31?
The BMW 5-Series Touring G31's center bore is 66.6mm. 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 5-Series Touring G31?
Factory wheels on the BMW 5-Series Touring G31 are F: 18x8.0J R: 18x9.0J.
What is the biggest wheel size I can fit on my BMW 5-Series Touring G31 without rubbing?
The most aggressive fitment we recommend without fender work is F 21x9.5J ET20 / R 21x10.5J ET30. 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 5-Series Touring G31?
For a flush look with minimal to no rubbing, we recommend F 20x9.0J ET25 / R 20x10.0J ET35 as a starting point on a stock or mildly lowered BMW 5-Series Touring G31.
Do I need wheel spacers for my BMW 5-Series Touring G31?
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 5-Series Touring G31?
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 5.98" backspacing up front and 6.88" 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 BMW 5-Series Touring G31?
Yes — the BMW 5-Series Touring G31'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.
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: TPMS (Tire Pressure Monitoring System) has been federally mandated on all new light vehicles sold in the US since the 2008 model year. If your wheels use OE-style sensors, have them transferred or cloned to the new wheels at installation.
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.