MAZDA MIATA (NA / NB) FITMENT

The NA Miata (1990–1997) and NB Miata (1998–2005) are the purest expression of "lightweight sports car" philosophy. These tiny roadsters weigh under 2,400 lbs and use a 4x100 bolt pattern with a 54.1mm center bore — one of the smallest bolt patterns on any performance car. While the 4x100 pattern limits off-the-shelf options, the Miata community has driven manufacturers to produce some of the best lightweight wheel options available. On a car this light, every gram matters — forged wheels have a dramatically amplified effect compared to heavier platforms.

Quick Reference
Bolt Pattern: 4x100 | Center Bore: 54.1mm | Hub Type: Conical Seat | Lug Torque: 88 Nm (65 ft-lb)
Warning: 4x100 is NOT the same as the NC Miata (5x114.3) or ND Miata (5x114.3). NA/NB wheels are unique to these generations.

15x8 Square — The Undisputed Standard

15x8 ET25 is the Miata community's sacred specification. It's been refined through millions of track miles across thousands of Miatas, and represents the perfect balance of width, weight, and tire selection for these featherweight roadsters.

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15x8 Flush Square

The undisputed king of Miata wheel sizing — 15x8 is the enthusiast standard for good reason.

Recommended Size: 15x8 ET25 all around
Street Tires: 205/50R15 Square
Performance Tires: 225/45R15 Square

Why this setup: ET25 provides a perfectly flush fitment on stock fenders — no rubbing, no modifications needed. The 205/50R15 is the Miata community's most popular tire size because it hits the ideal balance: wide enough for serious grip, narrow enough to not overwhelm the car's modest 116–133 hp, and light enough to preserve the Miata's immediate throttle and steering response. Going to 225/45R15 adds more grip but also more rotational mass — the wider tire is best reserved for autocross and track days where outright grip matters more than street responsiveness.

15x9 Square — Maximum Grip

For time attack and autocross Miatas that need maximum mechanical grip, the wider 15x9 setup pushes the platform's grip potential to its limits.

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15x9 Wide Square

The time attack and autocross Miata standard — maximum grip on a lightweight platform.

Recommended Size: 15x9 ET36 all around
Track Tires (200TW): 225/45R15 Square
R-Compound: 245/40R15 Square
Note: The higher ET36 offset is required to keep the wider 9" wheel within the fender. Fender rolling is almost always necessary on the NA. The NB accommodates 15x9 ET36 on stock fenders with careful coilover adjustment.

Why this setup: On a 2,200–2,400 lb car, a 225mm tire on a 9" wheel provides an absurd grip-to-weight ratio — these tiny Miatas can pull lateral G numbers that embarrass cars with three times their power. The wider 9" wheel opens the tire's tread face, creating a flatter contact patch for better mechanical grip. A forged 15x9 at under 12 lbs is transformative — the Miata's suspension feels like it's operating in a different reality compared to even the lightest cast wheels.

Recommended Tires by Use Case

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NA/NB Miata Tire Selection Guide

Street Performance: Hankook Ventus V12 evo2 (205/50R15) — affordable, excellent wet grip. The value champion for daily-driven Miatas.
Autocross: BFGoodrich Rival S 1.5 (225/45R15) — the autocross benchmark. Exceptional transient grip for the Miata's rapid direction changes.
Track Day (200TW): Yokohama Advan A052 (225/45R15) — highest peak grip. The Miata on A052s is one of the fastest cars pound-for-pound at any track event.
Budget Track: Hankook Ventus RS4 (205/50R15) — affordable, consistent, and durable. The ideal HPDE and Spec Miata tire.

NA vs NB — Key Fitment Differences

NA fenders: Tighter than NB. 15x9 almost always requires fender rolling on the NA. 15x8 fits without modification.
NB fenders: Slightly more generous. 15x9 ET36 fits on stock fenders with proper coilover height adjustment on most NB models.
Ride height sensitivity: Both generations are extremely sensitive to ride height changes. Always re-check clearance after any coilover or spring rate adjustment.
Weight philosophy: The Miata was designed to be the lightest possible sports car. Running heavy wheels contradicts its core engineering principle. Forged is the only choice that respects the platform.

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