| Code | Difference | = 50mph | 1000miles = | Diameter | Wall,in | Wall,mm |
|---|---|---|---|---|---|---|
| 255/35-20 | 0.00 % | 50.00 | 1,000.00 | 27.03 | 3.51 | 89.25 |
| 225/40-20 | +0.22 % | 50.11 | 997.82 | 27.09 | 3.54 | 90.00 |
| 295/30-20 | -0.22 % | 49.89 | 1,002.18 | 26.97 | 3.48 | 88.50 |
| 195/45-20 | -0.44 % | 49.78 | 1,004.37 | 26.91 | 3.45 | 87.75 |
| 165/55-20 | +0.44 % | 50.22 | 995.63 | 27.15 | 3.57 | 90.75 |
| 175/50-20 | -0.51 % | 49.75 | 1,005.10 | 26.89 | 3.44 | 87.50 |
| 305/30-20 | +0.66 % | 50.33 | 993.45 | 27.20 | 3.60 | 91.50 |
| 145/60-20 | -0.66 % | 49.67 | 1,006.55 | 26.85 | 3.43 | 87.00 |
| 205/45-20 | +0.87 % | 50.44 | 991.26 | 27.26 | 3.63 | 92.25 |
| 215/40-20 | -0.95 % | 49.53 | 1,009.47 | 26.77 | 3.39 | 86.00 |
| 185/50-20 | +0.95 % | 50.47 | 990.53 | 27.28 | 3.64 | 92.50 |
| 265/35-20 | +1.02 % | 50.51 | 989.80 | 27.30 | 3.65 | 92.75 |
| 245/35-20 | -1.02 % | 49.49 | 1,010.20 | 26.75 | 3.38 | 85.75 |
| 285/30-20 | -1.09 % | 49.45 | 1,010.92 | 26.73 | 3.37 | 85.50 |
| 155/60-20 | +1.09 % | 50.55 | 989.08 | 27.32 | 3.66 | 93.00 |
| 155/55-20 | -1.17 % | 49.42 | 1,011.65 | 26.71 | 3.36 | 85.25 |
| 235/40-20 | +1.38 % | 50.69 | 986.16 | 27.40 | 3.70 | 94.00 |
| 145/65-20 | +1.46 % | 50.73 | 985.43 | 27.42 | 3.71 | 94.25 |
| 315/30-20 | +1.53 % | 50.76 | 984.71 | 27.44 | 3.72 | 94.50 |
| 335/25-20 | -1.60 % | 49.20 | 1,016.02 | 26.59 | 3.30 | 83.75 |
| 185/45-20 | -1.75 % | 49.13 | 1,017.48 | 26.56 | 3.28 | 83.25 |
| 275/30-20 | -1.97 % | 49.02 | 1,019.66 | 26.50 | 3.25 | 82.50 |
| 165/50-20 | -1.97 % | 49.02 | 1,019.66 | 26.50 | 3.25 | 82.50 |
| 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
-15.44%
|
145/30-20
d=23.43
w=1.71
-13.33%
|
145/35-20
d=24.00
w=2.00
-11.22%
|
145/40-20
d=24.57
w=2.28
-9.10%
|
145/45-20
d=25.14
w=2.57
-6.99%
|
145/50-20
d=25.71
w=2.85
-4.88%
|
145/55-20
d=26.28
w=3.14
-2.77%
|
145/60-20
d=26.85
w=3.43
-0.66%
|
145/65-20
d=27.42
w=3.71
+1.46%
|
145/70-20
d=27.99
w=4.00
+3.57%
|
145/75-20
d=28.56
w=4.28
+5.68%
|
145/80-20
d=29.13
w=4.57
+7.79%
|
145/85-20
d=29.70
w=4.85
+9.91%
|
| 155 |
155/25-20
d=23.05
w=1.53
-14.71%
|
155/30-20
d=23.66
w=1.83
-12.45%
|
155/35-20
d=24.27
w=2.14
-10.20%
|
155/40-20
d=24.88
w=2.44
-7.94%
|
155/45-20
d=25.49
w=2.75
-5.68%
|
155/50-20
d=26.10
w=3.05
-3.42%
|
155/55-20
d=26.71
w=3.36
-1.17%
|
155/60-20
d=27.32
w=3.66
+1.09%
|
155/65-20
d=27.93
w=3.97
+3.35%
|
155/70-20
d=28.54
w=4.27
+5.61%
|
155/75-20
d=29.15
w=4.58
+7.87%
|
155/80-20
d=29.76
w=4.88
+10.12%
|
155/85-20
d=30.37
w=5.19
+12.38%
|
| 165 |
165/25-20
d=23.25
w=1.62
-13.98%
|
165/30-20
d=23.90
w=1.95
-11.58%
|
165/35-20
d=24.55
w=2.27
-9.18%
|
165/40-20
d=25.20
w=2.60
-6.77%
|
165/45-20
d=25.85
w=2.92
-4.37%
|
165/50-20
d=26.50
w=3.25
-1.97%
|
165/55-20
d=27.15
w=3.57
+0.44%
|
165/60-20
d=27.80
w=3.90
+2.84%
|
165/65-20
d=28.44
w=4.22
+5.24%
|
165/70-20
d=29.09
w=4.55
+7.65%
|
165/75-20
d=29.74
w=4.87
+10.05%
|
165/80-20
d=30.39
w=5.20
+12.45%
|
165/85-20
d=31.04
w=5.52
+14.86%
|
| 175 |
175/25-20
d=23.44
w=1.72
-13.26%
|
175/30-20
d=24.13
w=2.07
-10.71%
|
175/35-20
d=24.82
w=2.41
-8.16%
|
175/40-20
d=25.51
w=2.76
-5.61%
|
175/45-20
d=26.20
w=3.10
-3.06%
|
175/50-20
d=26.89
w=3.44
-0.51%
|
175/55-20
d=27.58
w=3.79
+2.04%
|
175/60-20
d=28.27
w=4.13
+4.59%
|
175/65-20
d=28.96
w=4.48
+7.14%
|
175/70-20
d=29.65
w=4.82
+9.69%
|
175/75-20
d=30.33
w=5.17
+12.24%
|
175/80-20
d=31.02
w=5.51
+14.79%
|
175/85-20
d=31.71
w=5.86
+17.33%
|
| 185 |
185/25-20
d=23.64
w=1.82
-12.53%
|
185/30-20
d=24.37
w=2.19
-9.83%
|
185/35-20
d=25.10
w=2.55
-7.14%
|
185/40-20
d=25.83
w=2.91
-4.44%
|
185/45-20
d=26.56
w=3.28
-1.75%
|
185/50-20
d=27.28
w=3.64
+0.95%
|
185/55-20
d=28.01
w=4.01
+3.64%
|
185/60-20
d=28.74
w=4.37
+6.34%
|
185/65-20
d=29.47
w=4.73
+9.03%
|
185/70-20
d=30.20
w=5.10
+11.73%
|
185/75-20
d=30.93
w=5.46
+14.42%
|
185/80-20
d=31.65
w=5.83
+17.12%
|
185/85-20
d=32.38
w=6.19
+19.81%
|
| 195 |
195/25-20
d=23.84
w=1.92
-11.80%
|
195/30-20
d=24.61
w=2.30
-8.96%
|
195/35-20
d=25.37
w=2.69
-6.12%
|
195/40-20
d=26.14
w=3.07
-3.28%
|
195/45-20
d=26.91
w=3.45
-0.44%
|
195/50-20
d=27.68
w=3.84
+2.40%
|
195/55-20
d=28.44
w=4.22
+5.24%
|
195/60-20
d=29.21
w=4.61
+8.08%
|
195/65-20
d=29.98
w=4.99
+10.92%
|
195/70-20
d=30.75
w=5.37
+13.77%
|
195/75-20
d=31.52
w=5.76
+16.61%
|
195/80-20
d=32.28
w=6.14
+19.45%
|
195/85-20
d=33.05
w=6.53
+22.29%
|
| 205 |
205/25-20
d=24.04
w=2.02
-11.07%
|
205/30-20
d=24.84
w=2.42
-8.08%
|
205/35-20
d=25.65
w=2.82
-5.10%
|
205/40-20
d=26.46
w=3.23
-2.11%
|
205/45-20
d=27.26
w=3.63
+0.87%
|
205/50-20
d=28.07
w=4.04
+3.86%
|
205/55-20
d=28.88
w=4.44
+6.85%
|
205/60-20
d=29.69
w=4.84
+9.83%
|
205/65-20
d=30.49
w=5.25
+12.82%
|
205/70-20
d=31.30
w=5.65
+15.80%
|
205/75-20
d=32.11
w=6.05
+18.79%
|
205/80-20
d=32.91
w=6.46
+21.78%
|
205/85-20
d=33.72
w=6.86
+24.76%
|
| 215 |
215/25-20
d=24.23
w=2.12
-10.34%
|
215/30-20
d=25.08
w=2.54
-7.21%
|
215/35-20
d=25.93
w=2.96
-4.08%
|
215/40-20
d=26.77
w=3.39
-0.95%
|
215/45-20
d=27.62
w=3.81
+2.18%
|
215/50-20
d=28.46
w=4.23
+5.32%
|
215/55-20
d=29.31
w=4.66
+8.45%
|
215/60-20
d=30.16
w=5.08
+11.58%
|
215/65-20
d=31.00
w=5.50
+14.71%
|
215/70-20
d=31.85
w=5.93
+17.84%
|
215/75-20
d=32.70
w=6.35
+20.98%
|
215/80-20
d=33.54
w=6.77
+24.11%
|
215/85-20
d=34.39
w=7.19
+27.24%
|
| 225 |
225/25-20
d=24.43
w=2.21
-9.61%
|
225/30-20
d=25.31
w=2.66
-6.34%
|
225/35-20
d=26.20
w=3.10
-3.06%
|
225/40-20
d=27.09
w=3.54
+0.22%
|
225/45-20
d=27.97
w=3.99
+3.50%
|
225/50-20
d=28.86
w=4.43
+6.77%
|
225/55-20
d=29.74
w=4.87
+10.05%
|
225/60-20
d=30.63
w=5.31
+13.33%
|
225/65-20
d=31.52
w=5.76
+16.61%
|
225/70-20
d=32.40
w=6.20
+19.88%
|
225/75-20
d=33.29
w=6.64
+23.16%
|
225/80-20
d=34.17
w=7.09
+26.44%
|
225/85-20
d=35.06
w=7.53
+29.72%
|
| 235 |
235/25-20
d=24.63
w=2.31
-8.89%
|
235/30-20
d=25.55
w=2.78
-5.46%
|
235/35-20
d=26.48
w=3.24
-2.04%
|
235/40-20
d=27.40
w=3.70
+1.38%
|
235/45-20
d=28.33
w=4.16
+4.81%
|
235/50-20
d=29.25
w=4.63
+8.23%
|
235/55-20
d=30.18
w=5.09
+11.65%
|
235/60-20
d=31.10
w=5.55
+15.08%
|
235/65-20
d=32.03
w=6.01
+18.50%
|
235/70-20
d=32.95
w=6.48
+21.92%
|
235/75-20
d=33.88
w=6.94
+25.35%
|
235/80-20
d=34.80
w=7.40
+28.77%
|
235/85-20
d=35.73
w=7.86
+32.19%
|
| 245 |
245/25-20
d=24.82
w=2.41
-8.16%
|
245/30-20
d=25.79
w=2.89
-4.59%
|
245/35-20
d=26.75
w=3.38
-1.02%
|
245/40-20
d=27.72
w=3.86
+2.55%
|
245/45-20
d=28.68
w=4.34
+6.12%
|
245/50-20
d=29.65
w=4.82
+9.69%
|
245/55-20
d=30.61
w=5.31
+13.26%
|
245/60-20
d=31.57
w=5.79
+16.82%
|
245/65-20
d=32.54
w=6.27
+20.39%
|
245/70-20
d=33.50
w=6.75
+23.96%
|
245/75-20
d=34.47
w=7.23
+27.53%
|
245/80-20
d=35.43
w=7.72
+31.10%
|
245/85-20
d=36.40
w=8.20
+34.67%
|
| 255 |
255/25-20
d=25.02
w=2.51
-7.43%
|
255/30-20
d=26.02
w=3.01
-3.71%
|
255/35-20
d=27.03
w=3.51
0.00%
|
255/40-20
d=28.03
w=4.02
+3.71%
|
255/45-20
d=29.04
w=4.52
+7.43%
|
255/50-20
d=30.04
w=5.02
+11.14%
|
255/55-20
d=31.04
w=5.52
+14.86%
|
255/60-20
d=32.05
w=6.02
+18.57%
|
255/65-20
d=33.05
w=6.53
+22.29%
|
255/70-20
d=34.06
w=7.03
+26.00%
|
255/75-20
d=35.06
w=7.53
+29.72%
|
255/80-20
d=36.06
w=8.03
+33.43%
|
255/85-20
d=37.07
w=8.53
+37.14%
|
| 265 |
265/25-20
d=25.22
w=2.61
-6.70%
|
265/30-20
d=26.26
w=3.13
-2.84%
|
265/35-20
d=27.30
w=3.65
+1.02%
|
265/40-20
d=28.35
w=4.17
+4.88%
|
265/45-20
d=29.39
w=4.69
+8.74%
|
265/50-20
d=30.43
w=5.22
+12.60%
|
265/55-20
d=31.48
w=5.74
+16.46%
|
265/60-20
d=32.52
w=6.26
+20.32%
|
265/65-20
d=33.56
w=6.78
+24.18%
|
265/70-20
d=34.61
w=7.30
+28.04%
|
265/75-20
d=35.65
w=7.82
+31.90%
|
265/80-20
d=36.69
w=8.35
+35.76%
|
265/85-20
d=37.74
w=8.87
+39.62%
|
| 275 |
275/25-20
d=25.41
w=2.71
-5.97%
|
275/30-20
d=26.50
w=3.25
-1.97%
|
275/35-20
d=27.58
w=3.79
+2.04%
|
275/40-20
d=28.66
w=4.33
+6.05%
|
275/45-20
d=29.74
w=4.87
+10.05%
|
275/50-20
d=30.83
w=5.41
+14.06%
|
275/55-20
d=31.91
w=5.95
+18.06%
|
275/60-20
d=32.99
w=6.50
+22.07%
|
275/65-20
d=34.07
w=7.04
+26.07%
|
275/70-20
d=35.16
w=7.58
+30.08%
|
275/75-20
d=36.24
w=8.12
+34.09%
|
275/80-20
d=37.32
w=8.66
+38.09%
|
275/85-20
d=38.41
w=9.20
+42.10%
|
| 285 |
285/25-20
d=25.61
w=2.81
-5.24%
|
285/30-20
d=26.73
w=3.37
-1.09%
|
285/35-20
d=27.85
w=3.93
+3.06%
|
285/40-20
d=28.98
w=4.49
+7.21%
|
285/45-20
d=30.10
w=5.05
+11.36%
|
285/50-20
d=31.22
w=5.61
+15.51%
|
285/55-20
d=32.34
w=6.17
+19.66%
|
285/60-20
d=33.46
w=6.73
+23.82%
|
285/65-20
d=34.59
w=7.29
+27.97%
|
285/70-20
d=35.71
w=7.85
+32.12%
|
285/75-20
d=36.83
w=8.42
+36.27%
|
285/80-20
d=37.95
w=8.98
+40.42%
|
285/85-20
d=39.07
w=9.54
+44.57%
|
| 295 |
295/25-20
d=25.81
w=2.90
-4.52%
|
295/30-20
d=26.97
w=3.48
-0.22%
|
295/35-20
d=28.13
w=4.06
+4.08%
|
295/40-20
d=29.29
w=4.65
+8.38%
|
295/45-20
d=30.45
w=5.23
+12.67%
|
295/50-20
d=31.61
w=5.81
+16.97%
|
295/55-20
d=32.78
w=6.39
+21.27%
|
295/60-20
d=33.94
w=6.97
+25.56%
|
295/65-20
d=35.10
w=7.55
+29.86%
|
295/70-20
d=36.26
w=8.13
+34.16%
|
295/75-20
d=37.42
w=8.71
+38.46%
|
295/80-20
d=38.58
w=9.29
+42.75%
|
295/85-20
d=39.74
w=9.87
+47.05%
|
| 305 |
305/25-20
d=26.00
w=3.00
-3.79%
|
305/30-20
d=27.20
w=3.60
+0.66%
|
305/35-20
d=28.41
w=4.20
+5.10%
|
305/40-20
d=29.61
w=4.80
+9.54%
|
305/45-20
d=30.81
w=5.40
+13.98%
|
305/50-20
d=32.01
w=6.00
+18.43%
|
305/55-20
d=33.21
w=6.60
+22.87%
|
305/60-20
d=34.41
w=7.20
+27.31%
|
305/65-20
d=35.61
w=7.81
+31.76%
|
305/70-20
d=36.81
w=8.41
+36.20%
|
305/75-20
d=38.01
w=9.01
+40.64%
|
305/80-20
d=39.21
w=9.61
+45.08%
|
305/85-20
d=40.41
w=10.21
+49.53%
|
| 315 |
315/25-20
d=26.20
w=3.10
-3.06%
|
315/30-20
d=27.44
w=3.72
+1.53%
|
315/35-20
d=28.68
w=4.34
+6.12%
|
315/40-20
d=29.92
w=4.96
+10.71%
|
315/45-20
d=31.16
w=5.58
+15.29%
|
315/50-20
d=32.40
w=6.20
+19.88%
|
315/55-20
d=33.64
w=6.82
+24.47%
|
315/60-20
d=34.88
w=7.44
+29.06%
|
315/65-20
d=36.12
w=8.06
+33.65%
|
315/70-20
d=37.36
w=8.68
+38.24%
|
315/75-20
d=38.60
w=9.30
+42.83%
|
315/80-20
d=39.84
w=9.92
+47.41%
|
315/85-20
d=41.08
w=10.54
+52.00%
|
| 325 |
325/25-20
d=26.40
w=3.20
-2.33%
|
325/30-20
d=27.68
w=3.84
+2.40%
|
325/35-20
d=28.96
w=4.48
+7.14%
|
325/40-20
d=30.24
w=5.12
+11.87%
|
325/45-20
d=31.52
w=5.76
+16.61%
|
325/50-20
d=32.80
w=6.40
+21.34%
|
325/55-20
d=34.07
w=7.04
+26.07%
|
325/60-20
d=35.35
w=7.68
+30.81%
|
325/65-20
d=36.63
w=8.32
+35.54%
|
325/70-20
d=37.91
w=8.96
+40.28%
|
325/75-20
d=39.19
w=9.60
+45.01%
|
325/80-20
d=40.47
w=10.24
+49.75%
|
325/85-20
d=41.75
w=10.88
+54.48%
|
| 335 |
335/25-20
d=26.59
w=3.30
-1.60%
|
335/30-20
d=27.91
w=3.96
+3.28%
|
335/35-20
d=29.23
w=4.62
+8.16%
|
335/40-20
d=30.55
w=5.28
+13.04%
|
335/45-20
d=31.87
w=5.94
+17.92%
|
335/50-20
d=33.19
w=6.59
+22.80%
|
335/55-20
d=34.51
w=7.25
+27.68%
|
335/60-20
d=35.83
w=7.91
+32.56%
|
335/65-20
d=37.15
w=8.57
+37.44%
|
335/70-20
d=38.46
w=9.23
+42.32%
|
335/75-20
d=39.78
w=9.89
+47.20%
|
335/80-20
d=41.10
w=10.55
+52.08%
|
335/85-20
d=42.42
w=11.21
+56.96%
|
|
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!