Wheels from Mitsubishi Lancer 2.0i on Hyundai i30 III: compatible?

Yes, the hub is identical

Same 5x114.3 PCD and same 67.1 mm centre bore: wheels from Mitsubishi Lancer 2.0i bolt on and centre on Hyundai i30 III without rings. You still need to check the offset and tyres, detailed below.

Mitsubishi Lancer 2.0i2003–2008Hyundai i30 IIIfrom 2017
PCD5x114.35x114.3
Centre bore67.1 mm67.1 mm
ThreadEcrous - 12x1.50M12x1.5
Original wheels ≈6Jx15 ET46 6Jx15 ET46
6.5Jx16 ET48
6.5Jx16 ET50
7Jx17 ET51
7.5Jx18 ET53

≈: width estimated from the original tyre size.

Wheel by wheel: offset and tyres

Each original wheel from Mitsubishi Lancer 2.0i is compared with the one from Hyundai i30 III 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.

  • ≈6Jx15 ET46 · 195/60R15 — Fits like the original

    Compared with the original 6Jx15 ET46 on Hyundai i30 III: shock absorber side 0 mm, wheel arch side 0 mm, tyre diameter −3.1 % : fit it with the original tyre size of Hyundai i30 III (195/65R15), not that of Mitsubishi Lancer 2.0i. Comparison for guidance only (estimated width). Check in detail

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 Hyundai i30 III (M12x1.5), 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 Hyundai i30 III on Mitsubishi Lancer 2.0i?