325/30 R21 téli gumi átmérője: 728 mm.

A 325/30 R21 váltóméretei (téli)

15 col: 215/80 R15, 235/75 R15

16 col: 205/80 R16, 215/75 R16, 225/70 R16, 235/70 R16, 255/65 R16

17 col: 205/70 R17, 225/65 R17, 235/65 R17, 255/60 R17

18 col: 225/60 R18, 255/55 R18

19 col: 225/55 R19, 235/50 R19, 245/50 R19, 255/50 R19, 275/45 R19

20 col: 195/55 R20, 245/45 R20, 255/45 R20, 265/40 R20, 275/40 R20, 285/40 R20, 315/35 R20

21 col: 255/40 R21, 275/35 R21, 285/35 R21, 315/30 R21

22 col: 295/30 R22