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Best Matches for 180/55-18 in 12", 13", 14", 15", 16", 16.5", 17", 18", 19", 20", 21".

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Code Difference = 50mph 1000miles = Diameter Wall,in Wall,mm
165/60-18 0.00 % 50.00 1,000.00 25.80 3.90 99.00
175/35-21 +0.11 % 50.05 998.93 25.82 2.41 61.25
185/40-20 +0.12 % 50.06 998.78 25.83 2.91 74.00
195/70-15 -0.18 % 49.91 1,001.83 25.75 5.37 136.50
205/30-21 +0.18 % 50.09 998.17 25.84 2.42 61.50
165/75-16 -0.20 % 49.90 1,001.98 25.74 4.87 123.75
165/45-20 +0.20 % 50.10 998.02 25.85 2.92 74.25
185/60-17 -0.21 % 49.89 1,002.14 25.74 4.37 111.00
205/85-12 -0.29 % 49.86 1,002.90 25.72 6.86 174.25
175/85-14 -0.32 % 49.84 1,003.21 25.71 5.86 148.75
195/60-16.5 -0.32 % 49.84 1,003.21 25.71 4.61 117.00
205/55-17 +0.32 % 50.16 996.79 25.88 4.44 112.75
175/50-19 +0.37 % 50.18 996.34 25.89 3.44 87.50
205/60-16 -0.43 % 49.79 1,004.27 25.69 4.84 123.00
195/45-19 +0.44 % 50.22 995.57 25.91 3.45 87.75
195/50-18 -0.46 % 49.77 1,004.58 25.68 3.84 97.50
205/80-13 +0.46 % 50.23 995.42 25.91 6.46 164.00
185/75-15 +0.50 % 50.25 994.96 25.93 5.46 138.75
185/80-14 -0.55 % 49.73 1,005.49 25.65 5.83 148.00
205/35-20 -0.56 % 49.72 1,005.65 25.65 2.82 71.75
175/70-16 -0.58 % 49.71 1,005.80 25.65 4.82 122.50
175/65-17 +0.63 % 50.31 993.74 25.96 4.48 113.75
185/65-16.5 +0.67 % 50.34 993.28 25.97 4.73 120.25
195/65-16 +0.72 % 50.36 992.83 25.98 4.99 126.75
195/30-21 -0.73 % 49.63 1,007.33 25.61 2.30 58.50
165/70-16.5 -0.78 % 49.61 1,007.78 25.59 4.55 115.50
175/55-18 -0.84 % 49.58 1,008.39 25.58 3.79 96.25
185/55-18 +0.84 % 50.42 991.61 26.01 4.01 101.75
175/80-15 +0.89 % 50.44 991.15 26.02 5.51 140.00
185/45-19 -0.93 % 49.53 1,009.31 25.56 3.28 83.25
165/85-15 +0.96 % 50.48 990.38 26.04 5.52 140.25
165/35-21 -0.96 % 49.52 1,009.62 25.55 2.27 57.75
195/85-13 +0.99 % 50.50 990.08 26.05 6.53 165.75
205/50-18 +1.07 % 50.53 989.32 26.07 4.04 102.50
195/75-14 -1.08 % 49.46 1,010.84 25.52 5.76 146.25
175/40-20 -1.10 % 49.45 1,010.99 25.51 2.76 70.00
165/70-17 +1.16 % 50.58 988.40 26.09 4.55 115.50
165/50-19 -1.16 % 49.42 1,011.60 25.50 3.25 82.50
205/65-15 -1.18 % 49.41 1,011.75 25.49 5.25 133.25
185/35-21 +1.18 % 50.59 988.25 26.10 2.55 64.75
205/75-14 +1.21 % 50.60 987.94 26.11 6.05 153.75
185/65-16 -1.27 % 49.37 1,012.67 25.47 4.73 120.25
175/65-16.5 -1.31 % 49.34 1,013.13 25.46 4.48 113.75
205/40-19 -1.31 % 49.34 1,013.13 25.46 3.23 82.00
195/40-20 +1.34 % 50.67 986.57 26.14 3.07 78.00
195/55-17 -1.36 % 49.32 1,013.58 25.44 4.22 107.25
165/65-17 -1.36 % 49.32 1,013.58 25.44 4.22 107.25
175/70-16.5 +1.36 % 50.68 986.42 26.15 4.82 122.50
165/55-19 +1.36 % 50.68 986.42 26.15 3.57 90.75
205/60-16.5 +1.51 % 50.76 984.89 26.19 4.84 123.00
165/80-15 -1.56 % 49.22 1,015.57 25.39 5.20 132.00
185/70-16 +1.56 % 50.78 984.43 26.20 5.10 129.50
165/40-21 +1.56 % 50.78 984.43 26.20 2.60 66.00
175/45-20 +1.57 % 50.79 984.28 26.20 3.10 78.75
185/85-13 -1.60 % 49.20 1,016.03 25.38 6.19 157.25
195/60-17 +1.62 % 50.81 983.82 26.21 4.61 117.00
205/55-16.5 -1.62 % 49.19 1,016.18 25.38 4.44 112.75
195/35-20 -1.63 % 49.18 1,016.33 25.37 2.69 68.25
185/30-21 -1.65 % 49.18 1,016.48 25.37 2.19 55.50
165/75-16.5 +1.74 % 50.87 982.60 26.24 4.87 123.75
175/75-15 -1.79 % 49.11 1,017.86 25.33 5.17 131.25
205/45-19 +1.82 % 50.91 981.84 26.26 3.63 92.25
175/60-18 +1.83 % 50.92 981.68 26.27 4.13 105.00
195/80-14 +1.89 % 50.95 981.07 26.28 6.14 156.00
185/50-19 +1.89 % 50.95 981.07 26.28 3.64 92.50
205/70-14 -1.92 % 49.04 1,019.23 25.30 5.65 143.50
205/70-15 +1.95 % 50.98 980.46 26.30 5.65 143.50
195/80-13 -1.98 % 49.01 1,019.84 25.28 6.14 156.00
185/50-18 -1.98 % 49.01 1,019.84 25.28 3.64 92.50
= 50mph
true speed when speedometer shows 50mph
1000miles =
odometer reading for actual 1000 miles
Ratio: 25 30 35 40 45 50 55 60 65 70 75 80 85
Wheel Size 12
Wheel Size 13
Wheel Size 14
Wheel Size 15
Wheel Size 16
Wheel Size 16.5
Wheel Size 17
165
165/25-17
d=20.25
w=1.62
-21.50%
165/30-17
d=20.90
w=1.95
-18.99%
165/35-17
d=21.55
w=2.27
-16.47%
165/40-17
d=22.20
w=2.60
-13.95%
165/45-17
d=22.85
w=2.92
-11.43%
165/50-17
d=23.50
w=3.25
-8.91%
165/55-17
d=24.15
w=3.57
-6.39%
165/60-17
d=24.80
w=3.90
-3.88%
165/65-17
d=25.44
w=4.22
-1.36%
165/70-17
d=26.09
w=4.55
+1.16%
165/75-17
d=26.74
w=4.87
+3.68%
165/80-17
d=27.39
w=5.20
+6.20%
165/85-17
d=28.04
w=5.52
+8.71%
175
175/25-17
d=20.44
w=1.72
-20.74%
175/30-17
d=21.13
w=2.07
-18.07%
175/35-17
d=21.82
w=2.41
-15.40%
175/40-17
d=22.51
w=2.76
-12.73%
175/45-17
d=23.20
w=3.10
-10.06%
175/50-17
d=23.89
w=3.44
-7.39%
175/55-17
d=24.58
w=3.79
-4.72%
175/60-17
d=25.27
w=4.13
-2.05%
175/65-17
d=25.96
w=4.48
+0.63%
175/70-17
d=26.65
w=4.82
+3.30%
175/75-17
d=27.33
w=5.17
+5.97%
175/80-17
d=28.02
w=5.51
+8.64%
175/85-17
d=28.71
w=5.86
+11.31%
185
185/25-17
d=20.64
w=1.82
-19.98%
185/30-17
d=21.37
w=2.19
-17.16%
185/35-17
d=22.10
w=2.55
-14.33%
185/40-17
d=22.83
w=2.91
-11.51%
185/45-17
d=23.56
w=3.28
-8.68%
185/50-17
d=24.28
w=3.64
-5.86%
185/55-17
d=25.01
w=4.01
-3.04%
185/60-17
d=25.74
w=4.37
-0.21%
185/65-17
d=26.47
w=4.73
+2.61%
185/70-17
d=27.20
w=5.10
+5.43%
185/75-17
d=27.93
w=5.46
+8.26%
185/80-17
d=28.65
w=5.83
+11.08%
185/85-17
d=29.38
w=6.19
+13.90%
195
195/25-17
d=20.84
w=1.92
-19.22%
195/30-17
d=21.61
w=2.30
-16.24%
195/35-17
d=22.37
w=2.69
-13.26%
195/40-17
d=23.14
w=3.07
-10.29%
195/45-17
d=23.91
w=3.45
-7.31%
195/50-17
d=24.68
w=3.84
-4.33%
195/55-17
d=25.44
w=4.22
-1.36%
195/60-17
d=26.21
w=4.61
+1.62%
195/65-17
d=26.98
w=4.99
+4.59%
195/70-17
d=27.75
w=5.37
+7.57%
195/75-17
d=28.52
w=5.76
+10.55%
195/80-17
d=29.28
w=6.14
+13.52%
195/85-17
d=30.05
w=6.53
+16.50%
205
205/25-17
d=21.04
w=2.02
-18.45%
205/30-17
d=21.84
w=2.42
-15.32%
205/35-17
d=22.65
w=2.82
-12.19%
205/40-17
d=23.46
w=3.23
-9.07%
205/45-17
d=24.26
w=3.63
-5.94%
205/50-17
d=25.07
w=4.04
-2.81%
205/55-17
d=25.88
w=4.44
+0.32%
205/60-17
d=26.69
w=4.84
+3.45%
205/65-17
d=27.49
w=5.25
+6.58%
205/70-17
d=28.30
w=5.65
+9.71%
205/75-17
d=29.11
w=6.05
+12.84%
205/80-17
d=29.91
w=6.46
+15.96%
205/85-17
d=30.72
w=6.86
+19.09%
Wheel Size 18
165
165/25-18
d=21.25
w=1.62
-17.63%
165/30-18
d=21.90
w=1.95
-15.11%
165/35-18
d=22.55
w=2.27
-12.59%
165/40-18
d=23.20
w=2.60
-10.07%
165/45-18
d=23.85
w=2.92
-7.55%
165/50-18
d=24.50
w=3.25
-5.04%
165/55-18
d=25.15
w=3.57
-2.52%
165/60-18
d=25.80
w=3.90
0.00%
165/65-18
d=26.44
w=4.22
+2.52%
165/70-18
d=27.09
w=4.55
+5.04%
165/75-18
d=27.74
w=4.87
+7.55%
165/80-18
d=28.39
w=5.20
+10.07%
165/85-18
d=29.04
w=5.52
+12.59%
175
175/25-18
d=21.44
w=1.72
-16.87%
175/30-18
d=22.13
w=2.07
-14.19%
175/35-18
d=22.82
w=2.41
-11.52%
175/40-18
d=23.51
w=2.76
-8.85%
175/45-18
d=24.20
w=3.10
-6.18%
175/50-18
d=24.89
w=3.44
-3.51%
175/55-18
d=25.58
w=3.79
-0.84%
175/60-18
d=26.27
w=4.13
+1.83%
175/65-18
d=26.96
w=4.48
+4.50%
175/70-18
d=27.65
w=4.82
+7.17%
175/75-18
d=28.33
w=5.17
+9.84%
175/80-18
d=29.02
w=5.51
+12.52%
175/85-18
d=29.71
w=5.86
+15.19%
185
185/25-18
d=21.64
w=1.82
-16.10%
185/30-18
d=22.37
w=2.19
-13.28%
185/35-18
d=23.10
w=2.55
-10.45%
185/40-18
d=23.83
w=2.91
-7.63%
185/45-18
d=24.56
w=3.28
-4.81%
185/50-18
d=25.28
w=3.64
-1.98%
185/55-18
d=26.01
w=4.01
+0.84%
185/60-18
d=26.74
w=4.37
+3.66%
185/65-18
d=27.47
w=4.73
+6.49%
185/70-18
d=28.20
w=5.10
+9.31%
185/75-18
d=28.93
w=5.46
+12.13%
185/80-18
d=29.65
w=5.83
+14.96%
185/85-18
d=30.38
w=6.19
+17.78%
195
195/25-18
d=21.84
w=1.92
-15.34%
195/30-18
d=22.61
w=2.30
-12.36%
195/35-18
d=23.37
w=2.69
-9.39%
195/40-18
d=24.14
w=3.07
-6.41%
195/45-18
d=24.91
w=3.45
-3.43%
195/50-18
d=25.68
w=3.84
-0.46%
195/55-18
d=26.44
w=4.22
+2.52%
195/60-18
d=27.21
w=4.61
+5.49%
195/65-18
d=27.98
w=4.99
+8.47%
195/70-18
d=28.75
w=5.37
+11.45%
195/75-18
d=29.52
w=5.76
+14.42%
195/80-18
d=30.28
w=6.14
+17.40%
195/85-18
d=31.05
w=6.53
+20.38%
205
205/25-18
d=22.04
w=2.02
-14.58%
205/30-18
d=22.84
w=2.42
-11.45%
205/35-18
d=23.65
w=2.82
-8.32%
205/40-18
d=24.46
w=3.23
-5.19%
205/45-18
d=25.26
w=3.63
-2.06%
205/50-18
d=26.07
w=4.04
+1.07%
205/55-18
d=26.88
w=4.44
+4.20%
205/60-18
d=27.69
w=4.84
+7.33%
205/65-18
d=28.49
w=5.25
+10.45%
205/70-18
d=29.30
w=5.65
+13.58%
205/75-18
d=30.11
w=6.05
+16.71%
205/80-18
d=30.91
w=6.46
+19.84%
205/85-18
d=31.72
w=6.86
+22.97%
Wheel Size 19
Wheel Size 20
Wheel Size 21

Disclaimer:

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!