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Current Tire Size: (examples: 185/65-14, 205/75-15)
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Best Matches for 155/80-12 in 12".
Code Width Ratio Wheel Diameter Wall," Wall,mm Diam.Diff. = 50mph 1000miles =
155/80-12 155 80 12 21.76 4.88 124.00 0.00% 50.00 1,000.00
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
145/85-12 145 85 12 21.70 4.85 123.25 -0.27% 49.86 1,002.71
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 [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%
145/80-12
d=21.13
w=4.57
-2.89%
145/85-12
d=21.70
w=4.85
-0.27%
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%
155/80-12
d=21.76
w=4.88
0.00%
155/85-12
d=22.37
w=5.19
+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%
165/80-12
d=22.39
w=5.20
+2.89%
165/85-12
d=23.04
w=5.52
+5.88%
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%
175/80-12
d=23.02
w=5.51
+5.79%
175/85-12
d=23.71
w=5.86
+8.95%
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%
185/80-12
d=23.65
w=5.83
+8.68%
185/85-12
d=24.38
w=6.19
+12.03%
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%
195/80-12
d=24.28
w=6.14
+11.58%
195/85-12
d=25.05
w=6.53
+15.10%
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%
205/80-12
d=24.91
w=6.46
+14.47%
205/85-12
d=25.72
w=6.86
+18.18%
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%
215/80-12
d=25.54
w=6.77
+17.37%
215/85-12
d=26.39
w=7.19
+21.26%
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%
225/80-12
d=26.17
w=7.09
+20.26%
225/85-12
d=27.06
w=7.53
+24.33%
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%
235/80-12
d=26.80
w=7.40
+23.15%
235/85-12
d=27.73
w=7.86
+27.41%
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%
245/80-12
d=27.43
w=7.72
+26.05%
245/85-12
d=28.40
w=8.20
+30.48%
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%
255/80-12
d=28.06
w=8.03
+28.94%
255/85-12
d=29.07
w=8.53
+33.56%
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%
265/80-12
d=28.69
w=8.35
+31.84%
265/85-12
d=29.74
w=8.87
+36.63%
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%
275/80-12
d=29.32
w=8.66
+34.73%
275/85-12
d=30.41
w=9.20
+39.71%
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%
285/80-12
d=29.95
w=8.98
+37.63%
285/85-12
d=31.07
w=9.54
+42.78%
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%
295/80-12
d=30.58
w=9.29
+40.52%
295/85-12
d=31.74
w=9.87
+45.86%
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%
305/80-12
d=31.21
w=9.61
+43.42%
305/85-12
d=32.41
w=10.21
+48.93%
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%
315/80-12
d=31.84
w=9.92
+46.31%
315/85-12
d=33.08
w=10.54
+52.01%
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%
325/80-12
d=32.47
w=10.24
+49.20%
325/85-12
d=33.75
w=10.88
+55.08%
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]

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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