2005 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

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

Wheels and hardware

Lug hardware

Wheel locks

Real-World 2005 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:

14-inch — 1 documented build
17-inch — 1 documented build
18-inch — 1 documented build

3 documented builds.

2005 Mazda MX-5 Miata custom wheel setup

Staggered · 17×9 ET30 / 17×9.5 ET25

Documented on a 2005 Mazda MX-5 Miata build — observed custom fitment, not a universal fit guarantee.

Wheel: Rota P45r

Front: 17×9 ET30 · 225/45R17
Rear: 17×9.5 ET25

Compared with OEM

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

Outer edge 37.4 mm farther toward fender (more outward poke)
Inner edge 13.4 mm closer to suspension (less inner clearance)
Width +2" vs OEM

View full build on Modified1

Staggered · 18×8.5 ET45 / Rear unknown

Documented on a 2005 Mazda MX-5 Miata build — observed custom fitment, not a universal fit guarantee.

Wheel: Konig Milligram

Front: 18×8.5 ET45 · 235/35R18
Rear: —

Compared with OEM

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

Outer edge 16 mm farther toward fender (more outward poke)
Inner edge 22.1 mm closer to suspension (less inner clearance)
Width +1.5" vs OEM
Diameter +1" vs OEM

View full build on Modified1

Staggered · 14×5.5 ET36 / Rear unknown

Documented on a 2005 Mazda MX-5 Miata build — observed custom fitment, not a universal fit guarantee.

Wheel: Volk CE28N

Front: 14×5.5 ET36
Rear: —

Compared with OEM

Compared with the 15×6 ET40 OEM configuration. Calculated geometry only — not fit confirmation.

Outer edge 2.3 mm less outward poke
Inner edge 10.3 mm farther from suspension (more inner clearance)
Width -0.5" vs OEM
Diameter -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

Open full fitment calculator

More specs for the 2005 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.