2004 Mazda MX-5 Miata Wheel Offset

Quick specs

Wheel size: 7x17 · 6x15 · 6.5x16
Offset: ET42 · ET38 · ET40
Backspacing: Multiple — see configurations
Bolt pattern: 4×100
Center bore: 54.1 mm
Thread: M12×1.5
Tire size: 205/40R17 · 215/35R17 · 195/50R15 · 205/45R16

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Showing matching bolt patterns and offsets up to 30 mm lower. Confirm center bore, load rating, and clearance at Tire Rack.

Configuration

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OEM configurations

Configuration	Rim	Offset	Backspacing	Tire	Bolt pattern	Center bore	Thread
1.8T · I4, Petrol	7x17	ET42	5.15 in	205/40R17	4x100	54.1 mm	M12 x 1.5
1.8T · I4, Petrol	7x17	ET38	5.00 in	215/35R17	4x100	54.1 mm	M12 x 1.5
1.8i · I4, Petrol	6x15	ET40	4.57 in	195/50R15	4x100	54.1 mm	M12 x 1.5
1.8i · I4, Petrol	6.5x16	ET40	4.82 in	205/45R16	4x100	54.1 mm	M12 x 1.5
1.8i · I4, Petrol	7x17	ET40	5.07 in	205/40R17	4x100	54.1 mm	M12 x 1.5

Lug hardware

Wheel locks

Real-World 2004 Mazda MX-5 Miata Wheel Setups

Observed aftermarket setups from documented Modified1 builds. These are individual build records — not OEM specifications and not clearance guarantees for every vehicle.

Common custom wheel sizes

Among builds in our database for this model year:

17-inch — 1 documented build

1 documented build.

2004 Mazda MX-5 Miata custom wheel setup

Staggered · 17×8 ET32 / 17×9 ET38

Documented on a 2004 Mazda MX-5 Miata build — observed custom fitment, not a universal fit guarantee.

Wheel: Work Emotion XT7

Front: 17×8 ET32 · 215/40R17
Rear: 17×9 ET38 · 235/40R17

Compared with OEM

Compared with the 17×7 ET42 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 22.7 mm farther toward fender (more outward poke)
Inner edge 2.7 mm closer to suspension (less inner clearance)
Width +1" vs OEM

View full build on Modified1

Compare your own setup

See how a different width or offset sits versus an OEM configuration for this year.

OEM baseline

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More specs for the 2004 Mazda MX-5 Miata

Each OEM row is a catalog configuration. Offset ranges are not collapsed when the database has exact setups. Documented aftermarket builds are observed setups only — not universal fit or clearance confirmation.