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2018 Mazda MX-5 RF Sport Black (UK) Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Mazda MX-5 RF Sport Black (UK) wheels? This page gives the 2018 Mazda MX-5 RF Sport Black (UK) bolt pattern (4x100), centre bore, factory rim size and the offset range for aftermarket and forged Mazda MX-5 RF Sport Black (UK) rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2018 Mazda MX-5 RF Sport Black (UK) uses a 4x100 bolt pattern with a 54.1 mm centre bore and M12x1.5 lug nuts. Factory wheels: 17x7J ET45. For aftermarket wheels, 17x8J ET35 sits flush.
Forged wheels for the 2018 Mazda MX-5 RF Sport Black (UK) — drilled 4x100 with a 54.1 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Mazda MX-5 RF Sport Black (UK) (2018): 4x100 bolt pattern, 54.1mm center bore, OE 17x7J ET45. Forged wheel fitment specs from ANKUSI.
Bolt Pattern4x100
Wheel Bolt/NutM12x1.5 Nut
Center Bore54.1mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year2018
CategoryRoadster
✓ 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) | 17x7J ET45 |
| Flush Fitment | 17x8J at ET35 offset |
Forged Wheel Designs for the Mazda MX-5 RF Sport Black (UK)
Every design below is forged to order, so it can be machined to the Mazda MX-5 RF Sport Black (UK)'s 4x100 bolt pattern and 54.1 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
Convertibles lose some of the structural rigidity a fixed roof provides, which means the suspension and wheels end up doing more of the work to keep the chassis composed. A forged wheel keeps unsprung mass down without sacrificing the strength margin the factory built in — useful on a platform that's already managing extra flex.
The Mazda MX-5 RF Sport Black (UK) ships from the factory on a 4x100 bolt pattern with a 54.1mm center bore and a 17x7J ET45 wheel. Our flush reference for the Mazda MX-5 RF Sport Black (UK) is 17x8J ET35.; our maximum aggressive reference is 17x8.5J ET30. — beyond that, expect clearance issues against the fender liner without further modification.
Mazda MX-5 RF Sport Black (UK) OE Wheel Specs
The Mazda MX-5 RF Sport Black (UK) ships from the factory on 4x100 bolt pattern wheels with a 54.1mm center bore. The stock wheel size is 17x7J ET45, 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 Mazda MX-5 RF Sport Black (UK) (2018) we drill the 4x100 pattern and cut the centre bore to 54.1mm 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 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) | 17x7J | ET45 | 5.77 in (147 mm) | — | — |
| Flush | 17x8J | ET35 | 5.88 in (149 mm) | +3 mm | +23 mm |
| Maximum | 17x8.5J | ET30 | 5.93 in (151 mm) | +4 mm | +34 mm |
Vehicles With the Same Hub as the Mazda MX-5 RF Sport Black (UK) (4x100, 54.1 mm Bore)
In our database, 154 other vehicle entries from 23 makes use exactly the same 4x100 bolt pattern and 54.1 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); 34.4% of those also use a 54.1 mm center bore.
Hub-Centric Rings for a 54.1 mm Center Bore
A wheel with a center bore larger than 54.1 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 56.1 mm | 56.1 → 54.1 mm |
| 57.1 mm | 57.1 → 54.1 mm |
| 60.1 mm | 60.1 → 54.1 mm |
| 63.4 mm | 63.4 → 54.1 mm |
| 73.1 mm | 73.1 → 54.1 mm |
ANKUSI forged wheels are bored to exactly 54.1 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Mazda MX-5 RF Sport Black (UK) use?
The 2018 Mazda MX-5 RF Sport Black (UK) uses a 4x100 bolt pattern.
How many lug bolts does the Mazda MX-5 RF Sport Black (UK) use?
The Mazda MX-5 RF Sport Black (UK) 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 Mazda MX-5 RF Sport Black (UK)?
The Mazda MX-5 RF Sport Black (UK)'s center bore is 54.1mm. 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 Mazda MX-5 RF Sport Black (UK)?
Factory wheels on the Mazda MX-5 RF Sport Black (UK) are 17x7J ET45.
What does a flush wheel fitment look like on the Mazda MX-5 RF Sport Black (UK)?
For a flush look with minimal to no rubbing, we recommend 17x8J at ET35 offset as a starting point on a stock or mildly lowered Mazda MX-5 RF Sport Black (UK).
Do I need wheel spacers for my Mazda MX-5 RF Sport Black (UK)?
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 Mazda MX-5 RF Sport Black (UK)?
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 5.88" 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 Mazda MX-5 RF Sport Black (UK)?
The Mazda MX-5 RF Sport Black (UK) 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.
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: 17x7 wheels · 17 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.