Introduction
The FD3S runs a factory offset of ET50. For a low, wide sports car that number surprises people — it is higher than a Silvia, higher than a Supra, and high enough that most aftermarket wheels marketed for JDM cars will sit noticeably further out than Mazda intended. The other thing worth knowing before you buy: the FD’s hub bore is not the same as the FC’s, even though both are 5×114.3.
Section 1: OEM Wheel Specifications
The FD3S uses 5×114.3 with a 67.1 mm hub bore, M12 x 1.5 lug nuts — note the Mazda thread pitch, which differs from Nissan’s M12 x 1.25.
| Variant | Years | Front Wheel | Rear Wheel | Front Tyre | Rear Tyre | Hub Bore |
|---|---|---|---|---|---|---|
| RX-7 Turbo (16-inch) | 1992–2003 | 8Jx16 ET50 | 8Jx16 ET50 | 225/50R16 | 225/50R16 | 67.1 mm |
| RX-7 Turbo (17-inch) | 1992–2003 | 8Jx17 ET50 | 8.5Jx17 ET50 | 235/45ZR17 | 255/40ZR17 | 67.1 mm |
FC and FD are not the same hub
| Generation | Years | Bolt Pattern | Hub Bore | OEM Size | Offset | Interchangeable? |
|---|---|---|---|---|---|---|
| FC3S | 1985–1992 | 5×114.3 | 59.6 mm | 6Jx15 · 6.5Jx15 · 7Jx16 | ET40 | Needs different hub centring |
| FD3S | 1992–2003 | 5×114.3 | 67.1 mm | 8Jx16 · 8Jx17 · 8.5Jx17 | ET50 | Needs different hub centring |
The bolt pattern is identical; the centring is not. An FC wheel bored to 59.6 mm will not slide onto an FD’s larger 67.1 mm hub at all. An FD wheel on an FC hub will bolt up but will not be hub-centric, which on a car of this performance is not something to accept casually. Check the bore, not just the pattern.
The 67.1 mm bore also happens to match the NC-generation Miata — the only other Mazda in this series to use it.
Section 2: Recommended Fitment Ranges
Factory-Faithful
Verified OEM: ET48–52 on 8J to 8.5J rims.
- 16-inch: 8J ET50 square
- 17-inch: 8J ET50 front, 8.5J ET50 rear — the offset stays the same, only width changes
- M12 x 1.5 lug nuts — Mazda pitch, not the Nissan M12 x 1.25
Street and Wide Body
- Common range: ET30 to ET45 on 9J–9.5J for street cars
- Wide body: ET15 and below on 10J and wider, with arch work to match
- Remember the ET50 baseline. A wheel at ET35 is already 15 mm further out than factory — on many other JDM cars ET35 would be close to standard
- These are scene norms, not manufacturer specifications. Measure your own car
Instagram Search Keywords
Post counts verified July 2026:
Chassis Tags:
- #FD3S (673K) #RX7FD (281K)
- #RX7FD3S (87K) #FC3S (343K)
Model Tags:
- #MazdaRX7 (765K)
Wheel Brand Tags:
- #RAYSWheels (776K) #WORKWheels (1.9M)
- #BBSWheels (1.1M)
Section 3: Real-World Build References
Reference image for style and stance — not a verified measurement of the ranges above.
White FD3S on bronze forged wheels, rear three-quarter view showing arch fill — via @takaki_fd3s
Section 4: Selection Tips and Cautions
- Check the hub bore, not just the pattern. FC is 59.6 mm, FD is 67.1 mm
- M12 x 1.5 lug nuts. Mazda pitch — do not use Nissan M12 x 1.25 nuts
- ET50 is the baseline. Judge every aftermarket offset against it, not against a generic JDM figure
- Brake clearance. Verify before dropping to 16-inch on a Turbo car
- Values have risen sharply. On a clean FD, genuine period wheels are increasingly part of the car’s value rather than a cost
Fitment verification checklist:
- ✓ Confirm 67.1 mm hub bore, or correct hub rings
- ✓ Confirm M12 x 1.5 lug nuts
- ✓ Judge offsets against ET50, not ET40
- ✓ Check caliper clearance before reducing diameter
- ✓ Confirm the wheel is genuine, not a replica
Conclusion
The FD3S is a car where the factory numbers matter more than usual, because they sit outside the range most JDM buyers have internalised. ET50 and a 67.1 mm bore are the two figures to carry into any search — and neither of them carries over from the FC that came before it.
Looking for genuine JDM wheels in FD sizes? Submit a Request and we will search our networks in Japan for the size and offset you need.
Related Fitment Guides
- Mazda RX-7 FC3S — the previous generation
- Mazda RX-8 — the successor, same 67.1 mm bore
- Mitsubishi Lancer Evolution IV-IX — the other 67.1 mm platform
- Honda S2000 — a comparable lightweight rear-drive fitment
Every guide in this series is built the same way: verified factory specifications, an offset diagram, and an honest account of what fits and what does not.