WheelOffset

2004 Mazda MX-5 Miata Wheel Offset

ET42 · ET38 · ET40

Quick specs

OEM offset
ET42 · ET38 · ET40
Wheel size
7x17 · 6x15 · 6.5x16
Backspacing
5.15 in · 5.00 in · 4.57 in · 4.82 in · 5.07 in
Bolt pattern
4×100
Center bore
54.1 mm
Tire size
205/40R17 · 215/35R17 · 195/50R15 · 205/45R16

OEM configurations

ConfigurationRimOffsetBackspacingTireBolt patternCenter boreThread
1.8T · I4, Petrol7x17ET425.15 in205/40R174x10054.1 mmM12 x 1.5
1.8T · I4, Petrol7x17ET385.00 in215/35R174x10054.1 mmM12 x 1.5
1.8i · I4, Petrol6x15ET404.57 in195/50R154x10054.1 mmM12 x 1.5
1.8i · I4, Petrol6.5x16ET404.82 in205/45R164x10054.1 mmM12 x 1.5
1.8i · I4, Petrol7x17ET405.07 in205/40R174x10054.1 mmM12 x 1.5

See how a different wheel would sit See wheel backspacing

What happens if you change the offset?

Compare your own setup

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

Open full fitment calculator

Wheels and hardware for this vehicle

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Lug hardware

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  • White Knight Chrome M12x1.50 Bulge Acorn Lug Nut, 20 Count

    M12 x 1.5

    Matches M12 x 1.5 thread — confirm wheel seat style

    Check price on Amazon

  • White Knight 3807BK-20AM Black Chrome M12x1.50 Spline Lug Nut, 20 items

    M12 x 1.5

    Matches M12 x 1.5 thread — confirm wheel seat style

    Check price on Amazon

Wheel locks

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  • MCGARD Chrome Cone Seat M12 x 1.5 Wheel Locks

    M12 x 1.5 · lock

    Matches M12 x 1.5 — confirm seat style for your wheel

    Check price on Amazon

  • Gorilla Automotive Wheel Locks With Washer (M12x1.50)

    M12 x 1.5 · lock

    Matches M12 x 1.5 — confirm seat style for your wheel

    Check price on Amazon

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

More specs for the 2004 Mazda MX-5 Miata

OEM offsets are catalog configurations, not an aftermarket “safe ET range.” Matching offset alone does not confirm clearance. Documented custom builds are observed setups only.