Code | Difference | = 50mph | 1000miles = | Diameter | Wall,in | Wall,mm |
---|---|---|---|---|---|---|
185/60-15 | 0.00 % | 50.00 | 1,000.00 | 23.74 | 4.37 | 111.00 |
205/45-16.5 | +0.10 % | 50.05 | 999.00 | 23.76 | 3.63 | 92.25 |
185/50-16.5 | +0.18 % | 50.09 | 998.18 | 23.78 | 3.64 | 92.50 |
185/80-12 | -0.36 % | 49.82 | 1,003.65 | 23.65 | 5.83 | 148.00 |
195/25-20 | +0.41 % | 50.21 | 995.85 | 23.84 | 1.92 | 48.75 |
185/25-20 | -0.41 % | 49.79 | 1,004.15 | 23.64 | 1.82 | 46.25 |
205/55-15 | +0.58 % | 50.29 | 994.20 | 23.88 | 4.44 | 112.75 |
195/75-12 | -0.95 % | 49.53 | 1,009.45 | 23.52 | 5.76 | 146.25 |
205/25-20 | +1.24 % | 50.62 | 987.56 | 24.04 | 2.02 | 51.25 |
195/55-15 | -1.24 % | 49.38 | 1,012.44 | 23.44 | 4.22 | 107.25 |
195/45-16.5 | -1.39 % | 49.30 | 1,013.93 | 23.41 | 3.45 | 87.75 |
205/75-12 | +1.54 % | 50.77 | 984.58 | 24.11 | 6.05 | 153.75 |
195/50-16.5 | +1.84 % | 50.92 | 981.59 | 24.18 | 3.84 | 97.50 |
205/70-12 | -1.86 % | 49.07 | 1,018.57 | 23.30 | 5.65 | 143.50 |
195/60-15 | +1.99 % | 51.00 | 980.10 | 24.21 | 4.61 | 117.00 |
Ratio: | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Wheel Size 12
|
|||||||||||||
185 |
185/25-12
d=15.64
w=1.82
-34.11%
|
185/30-12
d=16.37
w=2.19
-31.04%
|
185/35-12
d=17.10
w=2.55
-27.98%
|
185/40-12
d=17.83
w=2.91
-24.91%
|
185/45-12
d=18.56
w=3.28
-21.84%
|
185/50-12
d=19.28
w=3.64
-18.77%
|
185/55-12
d=20.01
w=4.01
-15.70%
|
185/60-12
d=20.74
w=4.37
-12.64%
|
185/65-12
d=21.47
w=4.73
-9.57%
|
185/70-12
d=22.20
w=5.10
-6.50%
|
185/75-12
d=22.93
w=5.46
-3.43%
|
185/80-12
d=23.65
w=5.83
-0.36%
|
185/85-12
d=24.38
w=6.19
+2.70%
|
195 |
195/25-12
d=15.84
w=1.92
-33.28%
|
195/30-12
d=16.61
w=2.30
-30.05%
|
195/35-12
d=17.37
w=2.69
-26.82%
|
195/40-12
d=18.14
w=3.07
-23.58%
|
195/45-12
d=18.91
w=3.45
-20.35%
|
195/50-12
d=19.68
w=3.84
-17.11%
|
195/55-12
d=20.44
w=4.22
-13.88%
|
195/60-12
d=21.21
w=4.61
-10.65%
|
195/65-12
d=21.98
w=4.99
-7.41%
|
195/70-12
d=22.75
w=5.37
-4.18%
|
195/75-12
d=23.52
w=5.76
-0.95%
|
195/80-12
d=24.28
w=6.14
+2.29%
|
195/85-12
d=25.05
w=6.53
+5.52%
|
205 |
205/25-12
d=16.04
w=2.02
-32.45%
|
205/30-12
d=16.84
w=2.42
-29.05%
|
205/35-12
d=17.65
w=2.82
-25.66%
|
205/40-12
d=18.46
w=3.23
-22.26%
|
205/45-12
d=19.26
w=3.63
-18.86%
|
205/50-12
d=20.07
w=4.04
-15.46%
|
205/55-12
d=20.88
w=4.44
-12.06%
|
205/60-12
d=21.69
w=4.84
-8.66%
|
205/65-12
d=22.49
w=5.25
-5.26%
|
205/70-12
d=23.30
w=5.65
-1.86%
|
205/75-12
d=24.11
w=6.05
+1.54%
|
205/80-12
d=24.91
w=6.46
+4.94%
|
205/85-12
d=25.72
w=6.86
+8.34%
|
Wheel Size 13
|
|||||||||||||
Wheel Size 14
|
|||||||||||||
Wheel Size 15
|
|||||||||||||
185 |
185/25-15
d=18.64
w=1.82
-21.48%
|
185/30-15
d=19.37
w=2.19
-18.41%
|
185/35-15
d=20.10
w=2.55
-15.34%
|
185/40-15
d=20.83
w=2.91
-12.27%
|
185/45-15
d=21.56
w=3.28
-9.20%
|
185/50-15
d=22.28
w=3.64
-6.14%
|
185/55-15
d=23.01
w=4.01
-3.07%
|
185/60-15
d=23.74
w=4.37
0.00%
|
185/65-15
d=24.47
w=4.73
+3.07%
|
185/70-15
d=25.20
w=5.10
+6.14%
|
185/75-15
d=25.93
w=5.46
+9.20%
|
185/80-15
d=26.65
w=5.83
+12.27%
|
185/85-15
d=27.38
w=6.19
+15.34%
|
195 |
195/25-15
d=18.84
w=1.92
-20.65%
|
195/30-15
d=19.61
w=2.30
-17.41%
|
195/35-15
d=20.37
w=2.69
-14.18%
|
195/40-15
d=21.14
w=3.07
-10.95%
|
195/45-15
d=21.91
w=3.45
-7.71%
|
195/50-15
d=22.68
w=3.84
-4.48%
|
195/55-15
d=23.44
w=4.22
-1.24%
|
195/60-15
d=24.21
w=4.61
+1.99%
|
195/65-15
d=24.98
w=4.99
+5.22%
|
195/70-15
d=25.75
w=5.37
+8.46%
|
195/75-15
d=26.52
w=5.76
+11.69%
|
195/80-15
d=27.28
w=6.14
+14.93%
|
195/85-15
d=28.05
w=6.53
+18.16%
|
205 |
205/25-15
d=19.04
w=2.02
-19.82%
|
205/30-15
d=19.84
w=2.42
-16.42%
|
205/35-15
d=20.65
w=2.82
-13.02%
|
205/40-15
d=21.46
w=3.23
-9.62%
|
205/45-15
d=22.26
w=3.63
-6.22%
|
205/50-15
d=23.07
w=4.04
-2.82%
|
205/55-15
d=23.88
w=4.44
+0.58%
|
205/60-15
d=24.69
w=4.84
+3.98%
|
205/65-15
d=25.49
w=5.25
+7.38%
|
205/70-15
d=26.30
w=5.65
+10.78%
|
205/75-15
d=27.11
w=6.05
+14.18%
|
205/80-15
d=27.91
w=6.46
+17.58%
|
205/85-15
d=28.72
w=6.86
+20.98%
|
Wheel Size 16
|
|||||||||||||
Wheel Size 16.5
|
|||||||||||||
185 |
185/25-16.5
d=20.14
w=1.82
-15.16%
|
185/30-16.5
d=20.87
w=2.19
-12.09%
|
185/35-16.5
d=21.60
w=2.55
-9.02%
|
185/40-16.5
d=22.33
w=2.91
-5.95%
|
185/45-16.5
d=23.06
w=3.28
-2.89%
|
185/50-16.5
d=23.78
w=3.64
+0.18%
|
185/55-16.5
d=24.51
w=4.01
+3.25%
|
185/60-16.5
d=25.24
w=4.37
+6.32%
|
185/65-16.5
d=25.97
w=4.73
+9.39%
|
185/70-16.5
d=26.70
w=5.10
+12.45%
|
185/75-16.5
d=27.43
w=5.46
+15.52%
|
185/80-16.5
d=28.15
w=5.83
+18.59%
|
185/85-16.5
d=28.88
w=6.19
+21.66%
|
195 |
195/25-16.5
d=20.34
w=1.92
-14.33%
|
195/30-16.5
d=21.11
w=2.30
-11.09%
|
195/35-16.5
d=21.87
w=2.69
-7.86%
|
195/40-16.5
d=22.64
w=3.07
-4.63%
|
195/45-16.5
d=23.41
w=3.45
-1.39%
|
195/50-16.5
d=24.18
w=3.84
+1.84%
|
195/55-16.5
d=24.94
w=4.22
+5.07%
|
195/60-16.5
d=25.71
w=4.61
+8.31%
|
195/65-16.5
d=26.48
w=4.99
+11.54%
|
195/70-16.5
d=27.25
w=5.37
+14.78%
|
195/75-16.5
d=28.02
w=5.76
+18.01%
|
195/80-16.5
d=28.78
w=6.14
+21.24%
|
195/85-16.5
d=29.55
w=6.53
+24.48%
|
205 |
205/25-16.5
d=20.54
w=2.02
-13.50%
|
205/30-16.5
d=21.34
w=2.42
-10.10%
|
205/35-16.5
d=22.15
w=2.82
-6.70%
|
205/40-16.5
d=22.96
w=3.23
-3.30%
|
205/45-16.5
d=23.76
w=3.63
+0.10%
|
205/50-16.5
d=24.57
w=4.04
+3.50%
|
205/55-16.5
d=25.38
w=4.44
+6.90%
|
205/60-16.5
d=26.19
w=4.84
+10.30%
|
205/65-16.5
d=26.99
w=5.25
+13.70%
|
205/70-16.5
d=27.80
w=5.65
+17.10%
|
205/75-16.5
d=28.61
w=6.05
+20.50%
|
205/80-16.5
d=29.41
w=6.46
+23.90%
|
205/85-16.5
d=30.22
w=6.86
+27.30%
|
Wheel Size 17
|
|||||||||||||
Wheel Size 18
|
|||||||||||||
Wheel Size 19
|
|||||||||||||
Wheel Size 20
|
|||||||||||||
185 |
185/25-20
d=23.64
w=1.82
-0.41%
|
185/30-20
d=24.37
w=2.19
+2.65%
|
185/35-20
d=25.10
w=2.55
+5.72%
|
185/40-20
d=25.83
w=2.91
+8.79%
|
185/45-20
d=26.56
w=3.28
+11.86%
|
185/50-20
d=27.28
w=3.64
+14.93%
|
185/55-20
d=28.01
w=4.01
+17.99%
|
185/60-20
d=28.74
w=4.37
+21.06%
|
185/65-20
d=29.47
w=4.73
+24.13%
|
185/70-20
d=30.20
w=5.10
+27.20%
|
185/75-20
d=30.93
w=5.46
+30.27%
|
185/80-20
d=31.65
w=5.83
+33.33%
|
185/85-20
d=32.38
w=6.19
+36.40%
|
195 |
195/25-20
d=23.84
w=1.92
+0.41%
|
195/30-20
d=24.61
w=2.30
+3.65%
|
195/35-20
d=25.37
w=2.69
+6.88%
|
195/40-20
d=26.14
w=3.07
+10.12%
|
195/45-20
d=26.91
w=3.45
+13.35%
|
195/50-20
d=27.68
w=3.84
+16.58%
|
195/55-20
d=28.44
w=4.22
+19.82%
|
195/60-20
d=29.21
w=4.61
+23.05%
|
195/65-20
d=29.98
w=4.99
+26.29%
|
195/70-20
d=30.75
w=5.37
+29.52%
|
195/75-20
d=31.52
w=5.76
+32.75%
|
195/80-20
d=32.28
w=6.14
+35.99%
|
195/85-20
d=33.05
w=6.53
+39.22%
|
205 |
205/25-20
d=24.04
w=2.02
+1.24%
|
205/30-20
d=24.84
w=2.42
+4.64%
|
205/35-20
d=25.65
w=2.82
+8.04%
|
205/40-20
d=26.46
w=3.23
+11.44%
|
205/45-20
d=27.26
w=3.63
+14.84%
|
205/50-20
d=28.07
w=4.04
+18.24%
|
205/55-20
d=28.88
w=4.44
+21.64%
|
205/60-20
d=29.69
w=4.84
+25.04%
|
205/65-20
d=30.49
w=5.25
+28.44%
|
205/70-20
d=31.30
w=5.65
+31.84%
|
205/75-20
d=32.11
w=6.05
+35.24%
|
205/80-20
d=32.91
w=6.46
+38.64%
|
205/85-20
d=33.72
w=6.86
+42.04%
|
Wheel Size 21
|
The information on this page is intended to be helpful, but there is absolutely no guarantee of its accuracy, safety, or applicability for any particular use. The data is calculated mathematically, not taken from any official or recommended guide.
Please excercise a common sense, follow manufacturer and dealer recommendations, and check with other sources.
Tires are a safety equipment, don't take their selection lightly!