| Code | Difference | = 50mph | 1000miles = | Diameter | Wall,in | Wall,mm |
|---|---|---|---|---|---|---|
| 245/60-20 | 0.00 % | 50.00 | 1,000.00 | 31.57 | 5.79 | 147.00 |
| 295/50-20 | +0.12 % | 50.06 | 998.75 | 31.61 | 5.81 | 147.50 |
| 325/45-20 | -0.19 % | 49.91 | 1,001.87 | 31.52 | 5.76 | 146.25 |
| 225/65-20 | -0.19 % | 49.91 | 1,001.87 | 31.52 | 5.76 | 146.25 |
| 195/75-20 | -0.19 % | 49.91 | 1,001.87 | 31.52 | 5.76 | 146.25 |
| 185/80-20 | +0.25 % | 50.12 | 997.51 | 31.65 | 5.83 | 148.00 |
| 265/55-20 | -0.31 % | 49.84 | 1,003.12 | 31.48 | 5.74 | 145.75 |
| 175/85-20 | +0.44 % | 50.22 | 995.64 | 31.71 | 5.86 | 148.75 |
| 215/70-20 | +0.87 % | 50.44 | 991.27 | 31.85 | 5.93 | 150.50 |
| 205/70-20 | -0.87 % | 49.56 | 1,008.73 | 31.30 | 5.65 | 143.50 |
| 335/45-20 | +0.94 % | 50.47 | 990.65 | 31.87 | 5.94 | 150.75 |
| 275/55-20 | +1.06 % | 50.53 | 989.40 | 31.91 | 5.95 | 151.25 |
| 285/50-20 | -1.12 % | 49.44 | 1,011.22 | 31.22 | 5.61 | 142.50 |
| 315/45-20 | -1.31 % | 49.35 | 1,013.09 | 31.16 | 5.58 | 141.75 |
| 305/50-20 | +1.37 % | 50.69 | 986.28 | 32.01 | 6.00 | 152.50 |
| 235/65-20 | +1.43 % | 50.72 | 985.66 | 32.03 | 6.01 | 152.75 |
| 235/60-20 | -1.50 % | 49.25 | 1,014.96 | 31.10 | 5.55 | 141.00 |
| 255/60-20 | +1.50 % | 50.75 | 985.04 | 32.05 | 6.02 | 153.00 |
| 255/55-20 | -1.68 % | 49.16 | 1,016.83 | 31.04 | 5.52 | 140.25 |
| 165/85-20 | -1.68 % | 49.16 | 1,016.83 | 31.04 | 5.52 | 140.25 |
| 205/75-20 | +1.68 % | 50.84 | 983.17 | 32.11 | 6.05 | 153.75 |
| 175/80-20 | -1.75 % | 49.13 | 1,017.46 | 31.02 | 5.51 | 140.00 |
| 215/65-20 | -1.81 % | 49.10 | 1,018.08 | 31.00 | 5.50 | 139.75 |
| Ratio: | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Wheel Size 12
|
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|
Wheel Size 13
|
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|
Wheel Size 14
|
|||||||||||||
|
Wheel Size 15
|
|||||||||||||
|
Wheel Size 16
|
|||||||||||||
|
Wheel Size 16.5
|
|||||||||||||
|
Wheel Size 17
|
|||||||||||||
|
Wheel Size 18
|
|||||||||||||
|
Wheel Size 19
|
|||||||||||||
|
Wheel Size 20
|
|||||||||||||
| 145 |
145/25-20
d=22.85
w=1.43
-27.62%
|
145/30-20
d=23.43
w=1.71
-25.81%
|
145/35-20
d=24.00
w=2.00
-24.00%
|
145/40-20
d=24.57
w=2.28
-22.19%
|
145/45-20
d=25.14
w=2.57
-20.39%
|
145/50-20
d=25.71
w=2.85
-18.58%
|
145/55-20
d=26.28
w=3.14
-16.77%
|
145/60-20
d=26.85
w=3.43
-14.96%
|
145/65-20
d=27.42
w=3.71
-13.15%
|
145/70-20
d=27.99
w=4.00
-11.35%
|
145/75-20
d=28.56
w=4.28
-9.54%
|
145/80-20
d=29.13
w=4.57
-7.73%
|
145/85-20
d=29.70
w=4.85
-5.92%
|
| 155 |
155/25-20
d=23.05
w=1.53
-27.00%
|
155/30-20
d=23.66
w=1.83
-25.06%
|
155/35-20
d=24.27
w=2.14
-23.13%
|
155/40-20
d=24.88
w=2.44
-21.20%
|
155/45-20
d=25.49
w=2.75
-19.26%
|
155/50-20
d=26.10
w=3.05
-17.33%
|
155/55-20
d=26.71
w=3.36
-15.40%
|
155/60-20
d=27.32
w=3.66
-13.47%
|
155/65-20
d=27.93
w=3.97
-11.53%
|
155/70-20
d=28.54
w=4.27
-9.60%
|
155/75-20
d=29.15
w=4.58
-7.67%
|
155/80-20
d=29.76
w=4.88
-5.74%
|
155/85-20
d=30.37
w=5.19
-3.80%
|
| 165 |
165/25-20
d=23.25
w=1.62
-26.37%
|
165/30-20
d=23.90
w=1.95
-24.31%
|
165/35-20
d=24.55
w=2.27
-22.26%
|
165/40-20
d=25.20
w=2.60
-20.20%
|
165/45-20
d=25.85
w=2.92
-18.14%
|
165/50-20
d=26.50
w=3.25
-16.08%
|
165/55-20
d=27.15
w=3.57
-14.03%
|
165/60-20
d=27.80
w=3.90
-11.97%
|
165/65-20
d=28.44
w=4.22
-9.91%
|
165/70-20
d=29.09
w=4.55
-7.86%
|
165/75-20
d=29.74
w=4.87
-5.80%
|
165/80-20
d=30.39
w=5.20
-3.74%
|
165/85-20
d=31.04
w=5.52
-1.68%
|
| 175 |
175/25-20
d=23.44
w=1.72
-25.75%
|
175/30-20
d=24.13
w=2.07
-23.57%
|
175/35-20
d=24.82
w=2.41
-21.38%
|
175/40-20
d=25.51
w=2.76
-19.20%
|
175/45-20
d=26.20
w=3.10
-17.02%
|
175/50-20
d=26.89
w=3.44
-14.84%
|
175/55-20
d=27.58
w=3.79
-12.66%
|
175/60-20
d=28.27
w=4.13
-10.47%
|
175/65-20
d=28.96
w=4.48
-8.29%
|
175/70-20
d=29.65
w=4.82
-6.11%
|
175/75-20
d=30.33
w=5.17
-3.93%
|
175/80-20
d=31.02
w=5.51
-1.75%
|
175/85-20
d=31.71
w=5.86
+0.44%
|
| 185 |
185/25-20
d=23.64
w=1.82
-25.12%
|
185/30-20
d=24.37
w=2.19
-22.82%
|
185/35-20
d=25.10
w=2.55
-20.51%
|
185/40-20
d=25.83
w=2.91
-18.20%
|
185/45-20
d=26.56
w=3.28
-15.90%
|
185/50-20
d=27.28
w=3.64
-13.59%
|
185/55-20
d=28.01
w=4.01
-11.28%
|
185/60-20
d=28.74
w=4.37
-8.98%
|
185/65-20
d=29.47
w=4.73
-6.67%
|
185/70-20
d=30.20
w=5.10
-4.36%
|
185/75-20
d=30.93
w=5.46
-2.06%
|
185/80-20
d=31.65
w=5.83
+0.25%
|
185/85-20
d=32.38
w=6.19
+2.56%
|
| 195 |
195/25-20
d=23.84
w=1.92
-24.50%
|
195/30-20
d=24.61
w=2.30
-22.07%
|
195/35-20
d=25.37
w=2.69
-19.64%
|
195/40-20
d=26.14
w=3.07
-17.21%
|
195/45-20
d=26.91
w=3.45
-14.78%
|
195/50-20
d=27.68
w=3.84
-12.34%
|
195/55-20
d=28.44
w=4.22
-9.91%
|
195/60-20
d=29.21
w=4.61
-7.48%
|
195/65-20
d=29.98
w=4.99
-5.05%
|
195/70-20
d=30.75
w=5.37
-2.62%
|
195/75-20
d=31.52
w=5.76
-0.19%
|
195/80-20
d=32.28
w=6.14
+2.24%
|
195/85-20
d=33.05
w=6.53
+4.68%
|
| 205 |
205/25-20
d=24.04
w=2.02
-23.88%
|
205/30-20
d=24.84
w=2.42
-21.32%
|
205/35-20
d=25.65
w=2.82
-18.77%
|
205/40-20
d=26.46
w=3.23
-16.21%
|
205/45-20
d=27.26
w=3.63
-13.65%
|
205/50-20
d=28.07
w=4.04
-11.10%
|
205/55-20
d=28.88
w=4.44
-8.54%
|
205/60-20
d=29.69
w=4.84
-5.99%
|
205/65-20
d=30.49
w=5.25
-3.43%
|
205/70-20
d=31.30
w=5.65
-0.87%
|
205/75-20
d=32.11
w=6.05
+1.68%
|
205/80-20
d=32.91
w=6.46
+4.24%
|
205/85-20
d=33.72
w=6.86
+6.80%
|
| 215 |
215/25-20
d=24.23
w=2.12
-23.25%
|
215/30-20
d=25.08
w=2.54
-20.57%
|
215/35-20
d=25.93
w=2.96
-17.89%
|
215/40-20
d=26.77
w=3.39
-15.21%
|
215/45-20
d=27.62
w=3.81
-12.53%
|
215/50-20
d=28.46
w=4.23
-9.85%
|
215/55-20
d=29.31
w=4.66
-7.17%
|
215/60-20
d=30.16
w=5.08
-4.49%
|
215/65-20
d=31.00
w=5.50
-1.81%
|
215/70-20
d=31.85
w=5.93
+0.87%
|
215/75-20
d=32.70
w=6.35
+3.55%
|
215/80-20
d=33.54
w=6.77
+6.23%
|
215/85-20
d=34.39
w=7.19
+8.92%
|
| 225 |
225/25-20
d=24.43
w=2.21
-22.63%
|
225/30-20
d=25.31
w=2.66
-19.83%
|
225/35-20
d=26.20
w=3.10
-17.02%
|
225/40-20
d=27.09
w=3.54
-14.21%
|
225/45-20
d=27.97
w=3.99
-11.41%
|
225/50-20
d=28.86
w=4.43
-8.60%
|
225/55-20
d=29.74
w=4.87
-5.80%
|
225/60-20
d=30.63
w=5.31
-2.99%
|
225/65-20
d=31.52
w=5.76
-0.19%
|
225/70-20
d=32.40
w=6.20
+2.62%
|
225/75-20
d=33.29
w=6.64
+5.42%
|
225/80-20
d=34.17
w=7.09
+8.23%
|
225/85-20
d=35.06
w=7.53
+11.03%
|
| 235 |
235/25-20
d=24.63
w=2.31
-22.01%
|
235/30-20
d=25.55
w=2.78
-19.08%
|
235/35-20
d=26.48
w=3.24
-16.15%
|
235/40-20
d=27.40
w=3.70
-13.22%
|
235/45-20
d=28.33
w=4.16
-10.29%
|
235/50-20
d=29.25
w=4.63
-7.36%
|
235/55-20
d=30.18
w=5.09
-4.43%
|
235/60-20
d=31.10
w=5.55
-1.50%
|
235/65-20
d=32.03
w=6.01
+1.43%
|
235/70-20
d=32.95
w=6.48
+4.36%
|
235/75-20
d=33.88
w=6.94
+7.29%
|
235/80-20
d=34.80
w=7.40
+10.22%
|
235/85-20
d=35.73
w=7.86
+13.15%
|
| 245 |
245/25-20
d=24.82
w=2.41
-21.38%
|
245/30-20
d=25.79
w=2.89
-18.33%
|
245/35-20
d=26.75
w=3.38
-15.27%
|
245/40-20
d=27.72
w=3.86
-12.22%
|
245/45-20
d=28.68
w=4.34
-9.16%
|
245/50-20
d=29.65
w=4.82
-6.11%
|
245/55-20
d=30.61
w=5.31
-3.05%
|
245/60-20
d=31.57
w=5.79
0.00%
|
245/65-20
d=32.54
w=6.27
+3.05%
|
245/70-20
d=33.50
w=6.75
+6.11%
|
245/75-20
d=34.47
w=7.23
+9.16%
|
245/80-20
d=35.43
w=7.72
+12.22%
|
245/85-20
d=36.40
w=8.20
+15.27%
|
| 255 |
255/25-20
d=25.02
w=2.51
-20.76%
|
255/30-20
d=26.02
w=3.01
-17.58%
|
255/35-20
d=27.03
w=3.51
-14.40%
|
255/40-20
d=28.03
w=4.02
-11.22%
|
255/45-20
d=29.04
w=4.52
-8.04%
|
255/50-20
d=30.04
w=5.02
-4.86%
|
255/55-20
d=31.04
w=5.52
-1.68%
|
255/60-20
d=32.05
w=6.02
+1.50%
|
255/65-20
d=33.05
w=6.53
+4.68%
|
255/70-20
d=34.06
w=7.03
+7.86%
|
255/75-20
d=35.06
w=7.53
+11.03%
|
255/80-20
d=36.06
w=8.03
+14.21%
|
255/85-20
d=37.07
w=8.53
+17.39%
|
| 265 |
265/25-20
d=25.22
w=2.61
-20.14%
|
265/30-20
d=26.26
w=3.13
-16.83%
|
265/35-20
d=27.30
w=3.65
-13.53%
|
265/40-20
d=28.35
w=4.17
-10.22%
|
265/45-20
d=29.39
w=4.69
-6.92%
|
265/50-20
d=30.43
w=5.22
-3.62%
|
265/55-20
d=31.48
w=5.74
-0.31%
|
265/60-20
d=32.52
w=6.26
+2.99%
|
265/65-20
d=33.56
w=6.78
+6.30%
|
265/70-20
d=34.61
w=7.30
+9.60%
|
265/75-20
d=35.65
w=7.82
+12.91%
|
265/80-20
d=36.69
w=8.35
+16.21%
|
265/85-20
d=37.74
w=8.87
+19.51%
|
| 275 |
275/25-20
d=25.41
w=2.71
-19.51%
|
275/30-20
d=26.50
w=3.25
-16.08%
|
275/35-20
d=27.58
w=3.79
-12.66%
|
275/40-20
d=28.66
w=4.33
-9.23%
|
275/45-20
d=29.74
w=4.87
-5.80%
|
275/50-20
d=30.83
w=5.41
-2.37%
|
275/55-20
d=31.91
w=5.95
+1.06%
|
275/60-20
d=32.99
w=6.50
+4.49%
|
275/65-20
d=34.07
w=7.04
+7.92%
|
275/70-20
d=35.16
w=7.58
+11.35%
|
275/75-20
d=36.24
w=8.12
+14.78%
|
275/80-20
d=37.32
w=8.66
+18.20%
|
275/85-20
d=38.41
w=9.20
+21.63%
|
| 285 |
285/25-20
d=25.61
w=2.81
-18.89%
|
285/30-20
d=26.73
w=3.37
-15.34%
|
285/35-20
d=27.85
w=3.93
-11.78%
|
285/40-20
d=28.98
w=4.49
-8.23%
|
285/45-20
d=30.10
w=5.05
-4.68%
|
285/50-20
d=31.22
w=5.61
-1.12%
|
285/55-20
d=32.34
w=6.17
+2.43%
|
285/60-20
d=33.46
w=6.73
+5.99%
|
285/65-20
d=34.59
w=7.29
+9.54%
|
285/70-20
d=35.71
w=7.85
+13.09%
|
285/75-20
d=36.83
w=8.42
+16.65%
|
285/80-20
d=37.95
w=8.98
+20.20%
|
285/85-20
d=39.07
w=9.54
+23.75%
|
| 295 |
295/25-20
d=25.81
w=2.90
-18.27%
|
295/30-20
d=26.97
w=3.48
-14.59%
|
295/35-20
d=28.13
w=4.06
-10.91%
|
295/40-20
d=29.29
w=4.65
-7.23%
|
295/45-20
d=30.45
w=5.23
-3.55%
|
295/50-20
d=31.61
w=5.81
+0.12%
|
295/55-20
d=32.78
w=6.39
+3.80%
|
295/60-20
d=33.94
w=6.97
+7.48%
|
295/65-20
d=35.10
w=7.55
+11.16%
|
295/70-20
d=36.26
w=8.13
+14.84%
|
295/75-20
d=37.42
w=8.71
+18.52%
|
295/80-20
d=38.58
w=9.29
+22.19%
|
295/85-20
d=39.74
w=9.87
+25.87%
|
| 305 |
305/25-20
d=26.00
w=3.00
-17.64%
|
305/30-20
d=27.20
w=3.60
-13.84%
|
305/35-20
d=28.41
w=4.20
-10.04%
|
305/40-20
d=29.61
w=4.80
-6.23%
|
305/45-20
d=30.81
w=5.40
-2.43%
|
305/50-20
d=32.01
w=6.00
+1.37%
|
305/55-20
d=33.21
w=6.60
+5.17%
|
305/60-20
d=34.41
w=7.20
+8.98%
|
305/65-20
d=35.61
w=7.81
+12.78%
|
305/70-20
d=36.81
w=8.41
+16.58%
|
305/75-20
d=38.01
w=9.01
+20.39%
|
305/80-20
d=39.21
w=9.61
+24.19%
|
305/85-20
d=40.41
w=10.21
+27.99%
|
| 315 |
315/25-20
d=26.20
w=3.10
-17.02%
|
315/30-20
d=27.44
w=3.72
-13.09%
|
315/35-20
d=28.68
w=4.34
-9.16%
|
315/40-20
d=29.92
w=4.96
-5.24%
|
315/45-20
d=31.16
w=5.58
-1.31%
|
315/50-20
d=32.40
w=6.20
+2.62%
|
315/55-20
d=33.64
w=6.82
+6.55%
|
315/60-20
d=34.88
w=7.44
+10.47%
|
315/65-20
d=36.12
w=8.06
+14.40%
|
315/70-20
d=37.36
w=8.68
+18.33%
|
315/75-20
d=38.60
w=9.30
+22.26%
|
315/80-20
d=39.84
w=9.92
+26.18%
|
315/85-20
d=41.08
w=10.54
+30.11%
|
| 325 |
325/25-20
d=26.40
w=3.20
-16.40%
|
325/30-20
d=27.68
w=3.84
-12.34%
|
325/35-20
d=28.96
w=4.48
-8.29%
|
325/40-20
d=30.24
w=5.12
-4.24%
|
325/45-20
d=31.52
w=5.76
-0.19%
|
325/50-20
d=32.80
w=6.40
+3.87%
|
325/55-20
d=34.07
w=7.04
+7.92%
|
325/60-20
d=35.35
w=7.68
+11.97%
|
325/65-20
d=36.63
w=8.32
+16.02%
|
325/70-20
d=37.91
w=8.96
+20.07%
|
325/75-20
d=39.19
w=9.60
+24.13%
|
325/80-20
d=40.47
w=10.24
+28.18%
|
325/85-20
d=41.75
w=10.88
+32.23%
|
| 335 |
335/25-20
d=26.59
w=3.30
-15.77%
|
335/30-20
d=27.91
w=3.96
-11.60%
|
335/35-20
d=29.23
w=4.62
-7.42%
|
335/40-20
d=30.55
w=5.28
-3.24%
|
335/45-20
d=31.87
w=5.94
+0.94%
|
335/50-20
d=33.19
w=6.59
+5.11%
|
335/55-20
d=34.51
w=7.25
+9.29%
|
335/60-20
d=35.83
w=7.91
+13.47%
|
335/65-20
d=37.15
w=8.57
+17.64%
|
335/70-20
d=38.46
w=9.23
+21.82%
|
335/75-20
d=39.78
w=9.89
+26.00%
|
335/80-20
d=41.10
w=10.55
+30.17%
|
335/85-20
d=42.42
w=11.21
+34.35%
|
|
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!