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Current Tire Size: (examples: 185/65-14, 205/75-15)
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Please enter the current size to see matches and a comparison.

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Ratio: 30 35 40 45 50 55 60 65 70 75 80 85
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145 145/30-18
d=21.43
w=1.71
145/35-18
d=22.00
w=2.00
145/40-18
d=22.57
w=2.28
145/45-18
d=23.14
w=2.57
145/50-18
d=23.71
w=2.85
145/55-18
d=24.28
w=3.14
145/60-18
d=24.85
w=3.43
145/65-18
d=25.42
w=3.71
145/70-18
d=25.99
w=4.00
145/75-18
d=26.56
w=4.28
145/80-18
d=27.13
w=4.57
145/85-18
d=27.70
w=4.85
155 155/30-18
d=21.66
w=1.83
155/35-18
d=22.27
w=2.14
155/40-18
d=22.88
w=2.44
155/45-18
d=23.49
w=2.75
155/50-18
d=24.10
w=3.05
155/55-18
d=24.71
w=3.36
155/60-18
d=25.32
w=3.66
155/65-18
d=25.93
w=3.97
155/70-18
d=26.54
w=4.27
155/75-18
d=27.15
w=4.58
155/80-18
d=27.76
w=4.88
155/85-18
d=28.37
w=5.19
165 165/30-18
d=21.90
w=1.95
165/35-18
d=22.55
w=2.27
165/40-18
d=23.20
w=2.60
165/45-18
d=23.85
w=2.92
165/50-18
d=24.50
w=3.25
165/55-18
d=25.15
w=3.57
165/60-18
d=25.80
w=3.90
165/65-18
d=26.44
w=4.22
165/70-18
d=27.09
w=4.55
165/75-18
d=27.74
w=4.87
165/80-18
d=28.39
w=5.20
165/85-18
d=29.04
w=5.52
175 175/30-18
d=22.13
w=2.07
175/35-18
d=22.82
w=2.41
175/40-18
d=23.51
w=2.76
175/45-18
d=24.20
w=3.10
175/50-18
d=24.89
w=3.44
175/55-18
d=25.58
w=3.79
175/60-18
d=26.27
w=4.13
175/65-18
d=26.96
w=4.48
175/70-18
d=27.65
w=4.82
175/75-18
d=28.33
w=5.17
175/80-18
d=29.02
w=5.51
175/85-18
d=29.71
w=5.86
185 185/30-18
d=22.37
w=2.19
185/35-18
d=23.10
w=2.55
185/40-18
d=23.83
w=2.91
185/45-18
d=24.56
w=3.28
185/50-18
d=25.28
w=3.64
185/55-18
d=26.01
w=4.01
185/60-18
d=26.74
w=4.37
185/65-18
d=27.47
w=4.73
185/70-18
d=28.20
w=5.10
185/75-18
d=28.93
w=5.46
185/80-18
d=29.65
w=5.83
185/85-18
d=30.38
w=6.19
195 195/30-18
d=22.61
w=2.30
195/35-18
d=23.37
w=2.69
195/40-18
d=24.14
w=3.07
195/45-18
d=24.91
w=3.45
195/50-18
d=25.68
w=3.84
195/55-18
d=26.44
w=4.22
195/60-18
d=27.21
w=4.61
195/65-18
d=27.98
w=4.99
195/70-18
d=28.75
w=5.37
195/75-18
d=29.52
w=5.76
195/80-18
d=30.28
w=6.14
195/85-18
d=31.05
w=6.53
205 205/30-18
d=22.84
w=2.42
205/35-18
d=23.65
w=2.82
205/40-18
d=24.46
w=3.23
205/45-18
d=25.26
w=3.63
205/50-18
d=26.07
w=4.04
205/55-18
d=26.88
w=4.44
205/60-18
d=27.69
w=4.84
205/65-18
d=28.49
w=5.25
205/70-18
d=29.30
w=5.65
205/75-18
d=30.11
w=6.05
205/80-18
d=30.91
w=6.46
205/85-18
d=31.72
w=6.86
215 215/30-18
d=23.08
w=2.54
215/35-18
d=23.93
w=2.96
215/40-18
d=24.77
w=3.39
215/45-18
d=25.62
w=3.81
215/50-18
d=26.46
w=4.23
215/55-18
d=27.31
w=4.66
215/60-18
d=28.16
w=5.08
215/65-18
d=29.00
w=5.50
215/70-18
d=29.85
w=5.93
215/75-18
d=30.70
w=6.35
215/80-18
d=31.54
w=6.77
215/85-18
d=32.39
w=7.19
225 225/30-18
d=23.31
w=2.66
225/35-18
d=24.20
w=3.10
225/40-18
d=25.09
w=3.54
225/45-18
d=25.97
w=3.99
225/50-18
d=26.86
w=4.43
225/55-18
d=27.74
w=4.87
225/60-18
d=28.63
w=5.31
225/65-18
d=29.52
w=5.76
225/70-18
d=30.40
w=6.20
225/75-18
d=31.29
w=6.64
225/80-18
d=32.17
w=7.09
225/85-18
d=33.06
w=7.53
235 235/30-18
d=23.55
w=2.78
235/35-18
d=24.48
w=3.24
235/40-18
d=25.40
w=3.70
235/45-18
d=26.33
w=4.16
235/50-18
d=27.25
w=4.63
235/55-18
d=28.18
w=5.09
235/60-18
d=29.10
w=5.55
235/65-18
d=30.03
w=6.01
235/70-18
d=30.95
w=6.48
235/75-18
d=31.88
w=6.94
235/80-18
d=32.80
w=7.40
235/85-18
d=33.73
w=7.86
245 245/30-18
d=23.79
w=2.89
245/35-18
d=24.75
w=3.38
245/40-18
d=25.72
w=3.86
245/45-18
d=26.68
w=4.34
245/50-18
d=27.65
w=4.82
245/55-18
d=28.61
w=5.31
245/60-18
d=29.57
w=5.79
245/65-18
d=30.54
w=6.27
245/70-18
d=31.50
w=6.75
245/75-18
d=32.47
w=7.23
245/80-18
d=33.43
w=7.72
245/85-18
d=34.40
w=8.20
255 255/30-18
d=24.02
w=3.01
255/35-18
d=25.03
w=3.51
255/40-18
d=26.03
w=4.02
255/45-18
d=27.04
w=4.52
255/50-18
d=28.04
w=5.02
255/55-18
d=29.04
w=5.52
255/60-18
d=30.05
w=6.02
255/65-18
d=31.05
w=6.53
255/70-18
d=32.06
w=7.03
255/75-18
d=33.06
w=7.53
255/80-18
d=34.06
w=8.03
255/85-18
d=35.07
w=8.53
265 265/30-18
d=24.26
w=3.13
265/35-18
d=25.30
w=3.65
265/40-18
d=26.35
w=4.17
265/45-18
d=27.39
w=4.69
265/50-18
d=28.43
w=5.22
265/55-18
d=29.48
w=5.74
265/60-18
d=30.52
w=6.26
265/65-18
d=31.56
w=6.78
265/70-18
d=32.61
w=7.30
265/75-18
d=33.65
w=7.82
265/80-18
d=34.69
w=8.35
265/85-18
d=35.74
w=8.87
275 275/30-18
d=24.50
w=3.25
275/35-18
d=25.58
w=3.79
275/40-18
d=26.66
w=4.33
275/45-18
d=27.74
w=4.87
275/50-18
d=28.83
w=5.41
275/55-18
d=29.91
w=5.95
275/60-18
d=30.99
w=6.50
275/65-18
d=32.07
w=7.04
275/70-18
d=33.16
w=7.58
275/75-18
d=34.24
w=8.12
275/80-18
d=35.32
w=8.66
275/85-18
d=36.41
w=9.20
285 285/30-18
d=24.73
w=3.37
285/35-18
d=25.85
w=3.93
285/40-18
d=26.98
w=4.49
285/45-18
d=28.10
w=5.05
285/50-18
d=29.22
w=5.61
285/55-18
d=30.34
w=6.17
285/60-18
d=31.46
w=6.73
285/65-18
d=32.59
w=7.29
285/70-18
d=33.71
w=7.85
285/75-18
d=34.83
w=8.42
285/80-18
d=35.95
w=8.98
285/85-18
d=37.07
w=9.54
295 295/30-18
d=24.97
w=3.48
295/35-18
d=26.13
w=4.06
295/40-18
d=27.29
w=4.65
295/45-18
d=28.45
w=5.23
295/50-18
d=29.61
w=5.81
295/55-18
d=30.78
w=6.39
295/60-18
d=31.94
w=6.97
295/65-18
d=33.10
w=7.55
295/70-18
d=34.26
w=8.13
295/75-18
d=35.42
w=8.71
295/80-18
d=36.58
w=9.29
295/85-18
d=37.74
w=9.87
305 305/30-18
d=25.20
w=3.60
305/35-18
d=26.41
w=4.20
305/40-18
d=27.61
w=4.80
305/45-18
d=28.81
w=5.40
305/50-18
d=30.01
w=6.00
305/55-18
d=31.21
w=6.60
305/60-18
d=32.41
w=7.20
305/65-18
d=33.61
w=7.81
305/70-18
d=34.81
w=8.41
305/75-18
d=36.01
w=9.01
305/80-18
d=37.21
w=9.61
305/85-18
d=38.41
w=10.21
315 315/30-18
d=25.44
w=3.72
315/35-18
d=26.68
w=4.34
315/40-18
d=27.92
w=4.96
315/45-18
d=29.16
w=5.58
315/50-18
d=30.40
w=6.20
315/55-18
d=31.64
w=6.82
315/60-18
d=32.88
w=7.44
315/65-18
d=34.12
w=8.06
315/70-18
d=35.36
w=8.68
315/75-18
d=36.60
w=9.30
315/80-18
d=37.84
w=9.92
315/85-18
d=39.08
w=10.54
325 325/30-18
d=25.68
w=3.84
325/35-18
d=26.96
w=4.48
325/40-18
d=28.24
w=5.12
325/45-18
d=29.52
w=5.76
325/50-18
d=30.80
w=6.40
325/55-18
d=32.07
w=7.04
325/60-18
d=33.35
w=7.68
325/65-18
d=34.63
w=8.32
325/70-18
d=35.91
w=8.96
325/75-18
d=37.19
w=9.60
325/80-18
d=38.47
w=10.24
325/85-18
d=39.75
w=10.88
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Disclaimer: The data presented here is in no way "official". Please use common sense and check with manufacturer recommendations and other references.


Thanx:
   Mark Sink's tire calculator -- for the idea and reference numbers
   Tirerack.com -- for quick and reliable service
   Mike.S -- for inspiration :)
   XAO::Web -- for bells and whistles that allowed to create this page in about an hour

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