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2009 Infiniti G37 Convertible Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Infiniti G37 Convertible wheels? This page gives the 2009 Infiniti G37 Convertible bolt pattern (5x114.3), centre bore, factory rim size and the offset range for aftermarket and forged Infiniti G37 Convertible rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2009 Infiniti G37 Convertible uses a 5x114.3 bolt pattern with a 66.1 mm centre bore and M12x1.25 lug nuts. Factory wheels: F: 18x7.5J R: 18x8.5J. For aftermarket wheels, 19x9.5J ET30 front / 19x10.5J ET32 rear sits flush and 20x9.5J ET25 front / 20x10.5J ET28 rear is the most aggressive fit.
Forged wheels for the 2009 Infiniti G37 Convertible — drilled 5x114.3 with a 66.1 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Infiniti G37 Convertible (2009): 5x114.3 bolt pattern, 66.1mm center bore. Factory wheels: F: 18x7.5J R: 18x8.5J. Reference fitment ranges.
Bolt Pattern5x114.3
Wheel Bolt/NutM12x1.25 Nut
Center Bore66.1mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year2009
CategoryConvertible
✓ 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) | F: 18x7.5J R: 18x8.5J |
| Flush Fitment | F 19x9.5J ET30 / R 19x10.5J ET32 |
| Maximum Aggressive | F 20x9.5J ET25 / R 20x10.5J ET28 |
Forged Wheel Designs for the Infiniti G37 Convertible
Every design below is forged to order, so it can be machined to the Infiniti G37 Convertible's 5x114.3 bolt pattern and 66.1 mm center bore, with the width and offset calculated for your setup.
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Advan-Style Bronze 5-Spoke Polished Lip Forged Wheels
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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
With less structural stiffness from the missing roof, a convertible's suspension tuning leans more heavily on unsprung mass control. Forged construction keeps wheel weight down at the same strength rating, which is one less variable working against the Infiniti G37 Convertible's chassis.
The Infiniti G37 Convertible runs a 5x114.3 bolt pattern, 66.1mm center bore, and a F: 18x7.5J wheel from the factory. Our Flush Fitment reference is F 19x9.5J ET30 / R 19x10.5J ET32, which tucks the tire under the fender lip on a stock-height Infiniti G37 Convertible. Our Maximum Aggressive reference is F 20x9.5J ET25 / R 20x10.5J ET28 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Infiniti G37 Convertible OE Wheel Specs
The 2009 Infiniti G37 Convertible (Convertible) uses a 5x114.3 bolt pattern with a 66.1mm center bore. Factory wheels are F: 18x7.5J R: 18x8.5J.
Why the factory spec works for most owners:
- Matches the chassis tuning used to help offset reduced structural rigidity
- Balances ride comfort with the sportier character typical of this body style
- Keeps unsprung weight low for stable handling
- Maintains clearance for the factory brake package and suspension components
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Infiniti G37 Convertible (2009) we drill the 5x114.3 pattern and cut the centre bore to 66.1mm 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.
Real-World Fitment Notes
Chassis: Stiffer lowering springs. Brakes: High-disk Akebonos. Tires: 225/50 R18 F, 245/45 R18 R.
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 18x7.5J ET43 → ~5.94″ F backspacing, R 18x8.5J ET45 → ~6.52″ R backspacing
- Flush: F 19x9.5J ET30 → ~6.43″ F backspacing, R 19x10.5J ET32 → ~7.01″ R backspacing
- Max: F 20x9.5J ET25 → ~6.23″ F backspacing, R 20x10.5J ET28 → ~6.85″ R 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 Infiniti spec, or want a wheel built to a custom offset for your Infiniti G37 Convertible? 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 Infiniti G37 Convertible (5x114.3, 66.1 mm Bore)
In our database, 224 other vehicle entries from 9 makes use exactly the same 5x114.3 bolt pattern and 66.1 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.
5x114.3 is used by 20.0% of the vehicle pages in our English fitment guide (1,300 of 6,503); 17.3% of those also use a 66.1 mm center bore.
Hub-Centric Rings for a 66.1 mm Center Bore
A wheel with a center bore larger than 66.1 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 66.6 mm | 66.6 → 66.1 mm |
| 67.1 mm | 67.1 → 66.1 mm |
| 70.1 mm | 70.1 → 66.1 mm |
| 70.5 mm | 70.5 → 66.1 mm |
| 73.1 mm | 73.1 → 66.1 mm |
ANKUSI forged wheels are bored to exactly 66.1 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Infiniti G37 Convertible use?
The 2009 Infiniti G37 Convertible uses a 5x114.3 bolt pattern.
How many lug bolts does the Infiniti G37 Convertible use?
The Infiniti G37 Convertible uses a 5-lug bolt pattern (5x114.3), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Infiniti G37 Convertible?
The Infiniti G37 Convertible's center bore is 66.1mm. 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 Infiniti G37 Convertible?
Factory wheels on the Infiniti G37 Convertible are F: 18x7.5J R: 18x8.5J.
What is the biggest wheel size I can fit on my Infiniti G37 Convertible without rubbing?
The most aggressive fitment we recommend without fender work is F 20x9.5J ET25 / R 20x10.5J ET28. 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 Infiniti G37 Convertible?
For a flush look with minimal to no rubbing, we recommend F 19x9.5J ET30 / R 19x10.5J ET32 as a starting point on a stock or mildly lowered Infiniti G37 Convertible.
Do I need wheel spacers for my Infiniti G37 Convertible?
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 Infiniti G37 Convertible?
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 6.43" backspacing up front and 7.01" 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 Infiniti G37 Convertible?
Yes — the Infiniti G37 Convertible'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.
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: 18x7.5 wheels · 18 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.