Yes, the hub is identical
Same 4x108 PCD and same 63.4 mm centre bore: wheels from Ford Fiesta MK1 bolt on and centre on Mazda 121 without rings. You still need to check the offset and tyres, detailed below.
≈: width estimated from the original tyre size.
Wheel by wheel: offset and tyres
Each original wheel from Ford Fiesta MK1 is compared with the one from Mazda 121 of the same diameter: how much closer the wheel gets to the shock absorber or how far it sticks out of the wheel arch, and whether the tyre keeps the same overall diameter.
- ✓
≈5Jx13 ET41 · 155/70R13 — Fits like the original
Compared with the original ≈5Jx13 ET43 on Mazda 121: shock absorber side −2 mm, wheel arch side +2 mm, tyre diameter +0 %.
Comparison for guidance only (estimated width). Check in detail
- ?
≈5.5Jx14 ET47 · 175/65R14
Mazda 121 has no 14-inch original wheel in our data: check the approved fitments and caliper clearance.
- ?
≈6Jx15 ET45 · 195/60R15
Mazda 121 has no 15-inch original wheel in our data: check the approved fitments and caliper clearance.
Before fitting the wheels
An identical hub is not enough: offset, width and diameter change the position of the wheel, and larger calipers can touch a smaller wheel. Original wheels often use bolts or nuts with a specific seat: keep the fixings intended for the wheel, with the thread of Mazda 121 (Ecrous - 12x1.50), tightened to the torque shown on its vehicle page. Finally, check that the size is among the approved fitments for your vehicle. This comparison is for guidance only: have the fitting approved by a professional.
And the other way round: wheels from Mazda 121 on Ford Fiesta MK1?