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This tire size calculator lets you check what you can replace your tires or wheels with without changing overall tire diameter or with some acceptable diameter change. The data presented here is in no way "official", please use common sense and check with manufacturer recommendations and other references.

Current Tire Size: (examples: 185/65-14, 205/75-15) How to link to this page?
Width: to Ratio: to Wheel (Rim Size): to
Max. Difference, %:
Best Matches for 155/80-12 in 12".
Code Width Ratio Wheel Diameter Wall," Wall,mm Diam.Diff. = 50mph 1000miles =
275/45-12 275 45 12 21.74 4.87 123.75 -0.09% 49.95 1,000.90
225/55-12 225 55 12 21.74 4.87 123.75 -0.09% 49.95 1,000.90
165/75-12 165 75 12 21.74 4.87 123.75 -0.09% 49.95 1,000.90
205/60-12 205 60 12 21.69 4.84 123.00 -0.36% 49.82 1,003.62
245/50-12 245 50 12 21.65 4.82 122.50 -0.54% 49.73 1,005.43
175/70-12 175 70 12 21.65 4.82 122.50 -0.54% 49.73 1,005.43
305/40-12 305 40 12 21.61 4.80 122.00 -0.72% 49.64 1,007.24
315/40-12 315 40 12 21.92 4.96 126.00 +0.72% 50.36 992.76
195/65-12 195 65 12 21.98 4.99 126.75 +0.99% 50.50 990.05
255/50-12 255 50 12 22.04 5.02 127.50 +1.27% 50.63 987.34
185/65-12 185 65 12 21.47 4.73 120.25 -1.36% 49.32 1,013.57
285/45-12 285 45 12 22.10 5.05 128.25 +1.54% 50.77 984.62
265/45-12 265 45 12 21.39 4.69 119.25 -1.72% 49.14 1,017.19
215/60-12 215 60 12 22.16 5.08 129.00 +1.81% 50.90 981.91
235/55-12 235 55 12 22.18 5.09 129.25 +1.90% 50.95 981.01
185/70-12 185 70 12 22.20 5.10 129.50 +1.99% 50.99 980.10
"= 50mph" - true speed when speedometer shows 50mph
"1000miles =" - odometer reading for actual 1000 miles

Click on [Show] to open charts and add wheel sizes to the matches table.
Ratio: 30 35 40 45 50 55 60 65 70 75 80 85
Wheel Size 12"  
145 145/30-12
d=15.43
w=1.71
-29.12%
145/35-12
d=16.00
w=2.00
-26.50%
145/40-12
d=16.57
w=2.28
-23.88%
145/45-12
d=17.14
w=2.57
-21.26%
145/50-12
d=17.71
w=2.85
-18.63%
145/55-12
d=18.28
w=3.14
-16.01%
145/60-12
d=18.85
w=3.43
-13.39%
145/65-12
d=19.42
w=3.71
-10.76%
145/70-12
d=19.99
w=4.00
-8.14%
145/75-12
d=20.56
w=4.28
-5.52%
155 155/30-12
d=15.66
w=1.83
-28.04%
155/35-12
d=16.27
w=2.14
-25.24%
155/40-12
d=16.88
w=2.44
-22.43%
155/45-12
d=17.49
w=2.75
-19.63%
155/50-12
d=18.10
w=3.05
-16.82%
155/55-12
d=18.71
w=3.36
-14.02%
155/60-12
d=19.32
w=3.66
-11.22%
155/65-12
d=19.93
w=3.97
-8.41%
155/70-12
d=20.54
w=4.27
-5.61%
155/75-12
d=21.15
w=4.58
-2.80%
165 165/30-12
d=15.90
w=1.95
-26.95%
165/35-12
d=16.55
w=2.27
-23.97%
165/40-12
d=17.20
w=2.60
-20.98%
165/45-12
d=17.85
w=2.92
-18.00%
165/50-12
d=18.50
w=3.25
-15.01%
165/55-12
d=19.15
w=3.57
-12.03%
165/60-12
d=19.80
w=3.90
-9.04%
165/65-12
d=20.44
w=4.22
-6.06%
165/70-12
d=21.09
w=4.55
-3.08%
165/75-12
d=21.74
w=4.87
-0.09%
175 175/30-12
d=16.13
w=2.07
-25.87%
175/35-12
d=16.82
w=2.41
-22.70%
175/40-12
d=17.51
w=2.76
-19.54%
175/45-12
d=18.20
w=3.10
-16.37%
175/50-12
d=18.89
w=3.44
-13.21%
175/55-12
d=19.58
w=3.79
-10.04%
175/60-12
d=20.27
w=4.13
-6.87%
175/65-12
d=20.96
w=4.48
-3.71%
175/70-12
d=21.65
w=4.82
-0.54%
175/75-12
d=22.33
w=5.17
+2.62%
185 185/30-12
d=16.37
w=2.19
-24.78%
185/35-12
d=17.10
w=2.55
-21.44%
185/40-12
d=17.83
w=2.91
-18.09%
185/45-12
d=18.56
w=3.28
-14.74%
185/50-12
d=19.28
w=3.64
-11.40%
185/55-12
d=20.01
w=4.01
-8.05%
185/60-12
d=20.74
w=4.37
-4.70%
185/65-12
d=21.47
w=4.73
-1.36%
185/70-12
d=22.20
w=5.10
+1.99%
185/75-12
d=22.93
w=5.46
+5.34%
195 195/30-12
d=16.61
w=2.30
-23.70%
195/35-12
d=17.37
w=2.69
-20.17%
195/40-12
d=18.14
w=3.07
-16.64%
195/45-12
d=18.91
w=3.45
-13.12%
195/50-12
d=19.68
w=3.84
-9.59%
195/55-12
d=20.44
w=4.22
-6.06%
195/60-12
d=21.21
w=4.61
-2.53%
195/65-12
d=21.98
w=4.99
+0.99%
195/70-12
d=22.75
w=5.37
+4.52%
195/75-12
d=23.52
w=5.76
+8.05%
205 205/30-12
d=16.84
w=2.42
-22.61%
205/35-12
d=17.65
w=2.82
-18.90%
205/40-12
d=18.46
w=3.23
-15.20%
205/45-12
d=19.26
w=3.63
-11.49%
205/50-12
d=20.07
w=4.04
-7.78%
205/55-12
d=20.88
w=4.44
-4.07%
205/60-12
d=21.69
w=4.84
-0.36%
205/65-12
d=22.49
w=5.25
+3.35%
205/70-12
d=23.30
w=5.65
+7.05%
205/75-12
d=24.11
w=6.05
+10.76%
215 215/30-12
d=17.08
w=2.54
-21.53%
215/35-12
d=17.93
w=2.96
-17.64%
215/40-12
d=18.77
w=3.39
-13.75%
215/45-12
d=19.62
w=3.81
-9.86%
215/50-12
d=20.46
w=4.23
-5.97%
215/55-12
d=21.31
w=4.66
-2.08%
215/60-12
d=22.16
w=5.08
+1.81%
215/65-12
d=23.00
w=5.50
+5.70%
215/70-12
d=23.85
w=5.93
+9.59%
215/75-12
d=24.70
w=6.35
+13.48%
225 225/30-12
d=17.31
w=2.66
-20.44%
225/35-12
d=18.20
w=3.10
-16.37%
225/40-12
d=19.09
w=3.54
-12.30%
225/45-12
d=19.97
w=3.99
-8.23%
225/50-12
d=20.86
w=4.43
-4.16%
225/55-12
d=21.74
w=4.87
-0.09%
225/60-12
d=22.63
w=5.31
+3.98%
225/65-12
d=23.52
w=5.76
+8.05%
225/70-12
d=24.40
w=6.20
+12.12%
225/75-12
d=25.29
w=6.64
+16.19%
235 235/30-12
d=17.55
w=2.78
-19.36%
235/35-12
d=18.48
w=3.24
-15.10%
235/40-12
d=19.40
w=3.70
-10.85%
235/45-12
d=20.33
w=4.16
-6.60%
235/50-12
d=21.25
w=4.63
-2.35%
235/55-12
d=22.18
w=5.09
+1.90%
235/60-12
d=23.10
w=5.55
+6.15%
235/65-12
d=24.03
w=6.01
+10.40%
235/70-12
d=24.95
w=6.48
+14.65%
235/75-12
d=25.88
w=6.94
+18.90%
245 245/30-12
d=17.79
w=2.89
-18.27%
245/35-12
d=18.75
w=3.38
-13.84%
245/40-12
d=19.72
w=3.86
-9.41%
245/45-12
d=20.68
w=4.34
-4.97%
245/50-12
d=21.65
w=4.82
-0.54%
245/55-12
d=22.61
w=5.31
+3.89%
245/60-12
d=23.57
w=5.79
+8.32%
245/65-12
d=24.54
w=6.27
+12.75%
245/70-12
d=25.50
w=6.75
+17.19%
245/75-12
d=26.47
w=7.23
+21.62%
255 255/30-12
d=18.02
w=3.01
-17.19%
255/35-12
d=19.03
w=3.51
-12.57%
255/40-12
d=20.03
w=4.02
-7.96%
255/45-12
d=21.04
w=4.52
-3.35%
255/50-12
d=22.04
w=5.02
+1.27%
255/55-12
d=23.04
w=5.52
+5.88%
255/60-12
d=24.05
w=6.02
+10.49%
255/65-12
d=25.05
w=6.53
+15.10%
255/70-12
d=26.06
w=7.03
+19.72%
255/75-12
d=27.06
w=7.53
+24.33%
265 265/30-12
d=18.26
w=3.13
-16.10%
265/35-12
d=19.30
w=3.65
-11.31%
265/40-12
d=20.35
w=4.17
-6.51%
265/45-12
d=21.39
w=4.69
-1.72%
265/50-12
d=22.43
w=5.22
+3.08%
265/55-12
d=23.48
w=5.74
+7.87%
265/60-12
d=24.52
w=6.26
+12.66%
265/65-12
d=25.56
w=6.78
+17.46%
265/70-12
d=26.61
w=7.30
+22.25%
265/75-12
d=27.65
w=7.82
+27.04%
275 275/30-12
d=18.50
w=3.25
-15.01%
275/35-12
d=19.58
w=3.79
-10.04%
275/40-12
d=20.66
w=4.33
-5.07%
275/45-12
d=21.74
w=4.87
-0.09%
275/50-12
d=22.83
w=5.41
+4.88%
275/55-12
d=23.91
w=5.95
+9.86%
275/60-12
d=24.99
w=6.50
+14.83%
275/65-12
d=26.07
w=7.04
+19.81%
275/70-12
d=27.16
w=7.58
+24.78%
275/75-12
d=28.24
w=8.12
+29.76%
285 285/30-12
d=18.73
w=3.37
-13.93%
285/35-12
d=19.85
w=3.93
-8.77%
285/40-12
d=20.98
w=4.49
-3.62%
285/45-12
d=22.10
w=5.05
+1.54%
285/50-12
d=23.22
w=5.61
+6.69%
285/55-12
d=24.34
w=6.17
+11.85%
285/60-12
d=25.46
w=6.73
+17.00%
285/65-12
d=26.59
w=7.29
+22.16%
285/70-12
d=27.71
w=7.85
+27.32%
285/75-12
d=28.83
w=8.42
+32.47%
295 295/30-12
d=18.97
w=3.48
-12.84%
295/35-12
d=20.13
w=4.06
-7.51%
295/40-12
d=21.29
w=4.65
-2.17%
295/45-12
d=22.45
w=5.23
+3.17%
295/50-12
d=23.61
w=5.81
+8.50%
295/55-12
d=24.78
w=6.39
+13.84%
295/60-12
d=25.94
w=6.97
+19.18%
295/65-12
d=27.10
w=7.55
+24.51%
295/70-12
d=28.26
w=8.13
+29.85%
295/75-12
d=29.42
w=8.71
+35.18%
305 305/30-12
d=19.20
w=3.60
-11.76%
305/35-12
d=20.41
w=4.20
-6.24%
305/40-12
d=21.61
w=4.80
-0.72%
305/45-12
d=22.81
w=5.40
+4.79%
305/50-12
d=24.01
w=6.00
+10.31%
305/55-12
d=25.21
w=6.60
+15.83%
305/60-12
d=26.41
w=7.20
+21.35%
305/65-12
d=27.61
w=7.81
+26.86%
305/70-12
d=28.81
w=8.41
+32.38%
305/75-12
d=30.01
w=9.01
+37.90%
315 315/30-12
d=19.44
w=3.72
-10.67%
315/35-12
d=20.68
w=4.34
-4.97%
315/40-12
d=21.92
w=4.96
+0.72%
315/45-12
d=23.16
w=5.58
+6.42%
315/50-12
d=24.40
w=6.20
+12.12%
315/55-12
d=25.64
w=6.82
+17.82%
315/60-12
d=26.88
w=7.44
+23.52%
315/65-12
d=28.12
w=8.06
+29.21%
315/70-12
d=29.36
w=8.68
+34.91%
315/75-12
d=30.60
w=9.30
+40.61%
325 325/30-12
d=19.68
w=3.84
-9.59%
325/35-12
d=20.96
w=4.48
-3.71%
325/40-12
d=22.24
w=5.12
+2.17%
325/45-12
d=23.52
w=5.76
+8.05%
325/50-12
d=24.80
w=6.40
+13.93%
325/55-12
d=26.07
w=7.04
+19.81%
325/60-12
d=27.35
w=7.68
+25.69%
325/65-12
d=28.63
w=8.32
+31.57%
325/70-12
d=29.91
w=8.96
+37.45%
325/75-12
d=31.19
w=9.60
+43.32%
Wheel Size 13" [Show] [Hide]
Wheel Size 14" [Show] [Hide]
Wheel Size 15" [Show] [Hide]
Wheel Size 16" [Show] [Hide]
Wheel Size 16.5" [Show] [Hide]
Wheel Size 17" [Show] [Hide]
Wheel Size 18" [Show] [Hide]
Wheel Size 19" [Show] [Hide]
Wheel Size 20" [Show] [Hide]
Wheel Size 21" [Show] [Hide]

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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