I'm seeing this question being asked more and more so I'll make a sticky here that members can look up:
15-inch:
Width - 6.0 inches
Offset - 52.5mm
Tire size - P195/65R15 H-rated
16-inch:
Width - 6.5 inches
Offset - 52.5mm
Tire size - P205/55R16 H-rated
17-inch:
Width - 6.5 inches
Offset - 52.5mm
Tire size - P205/50R17 V-rated
Note: In N. American-spec, the Mazda3 2.3l engine is packaged with larger rotors, so any N. American-spec Mazda3 2.3l cannot go lower than 16-inch rims (brakes won't clear).
Spare tire
For 15-inch wheels: T115/70D15
For 16 or 17-inch wheels: T125/70D16
Edit: Bolt pattern is 5x114.3
15-inch:
Width - 6.0 inches
Offset - 52.5mm
Tire size - P195/65R15 H-rated
16-inch:
Width - 6.5 inches
Offset - 52.5mm
Tire size - P205/55R16 H-rated
17-inch:
Width - 6.5 inches
Offset - 52.5mm
Tire size - P205/50R17 V-rated
Note: In N. American-spec, the Mazda3 2.3l engine is packaged with larger rotors, so any N. American-spec Mazda3 2.3l cannot go lower than 16-inch rims (brakes won't clear).
Spare tire
For 15-inch wheels: T115/70D15
For 16 or 17-inch wheels: T125/70D16
Edit: Bolt pattern is 5x114.3
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