| Code | Difference | = 50mph | 1000miles = | Diameter | Wall,in | Wall,mm |
|---|---|---|---|---|---|---|
| 255/85-20 | +0.30 % | 50.15 | 997.02 | 37.07 | 8.53 | 216.75 |
| 285/75-20 | -0.34 % | 49.83 | 1,003.41 | 36.83 | 8.42 | 213.75 |
| 305/70-20 | -0.39 % | 49.80 | 1,003.94 | 36.81 | 8.41 | 213.50 |
| 335/65-20 | +0.51 % | 50.26 | 994.89 | 37.15 | 8.57 | 217.75 |
| 265/80-20 | -0.71 % | 49.64 | 1,007.14 | 36.69 | 8.35 | 212.00 |
| 325/65-20 | -0.87 % | 49.56 | 1,008.74 | 36.63 | 8.32 | 211.25 |
| 275/80-20 | +0.99 % | 50.50 | 990.09 | 37.32 | 8.66 | 220.00 |
| 315/70-20 | +1.10 % | 50.55 | 989.03 | 37.36 | 8.68 | 220.50 |
| 295/75-20 | +1.26 % | 50.63 | 987.43 | 37.42 | 8.71 | 221.25 |
| 245/85-20 | -1.51 % | 49.24 | 1,015.13 | 36.40 | 8.20 | 208.25 |
| 295/70-20 | -1.89 % | 49.06 | 1,018.86 | 36.26 | 8.13 | 206.50 |
| 275/75-20 | -1.94 % | 49.03 | 1,019.39 | 36.24 | 8.12 | 206.25 |
| Ratio: | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Wheel Size 12
|
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|
Wheel Size 13
|
|||||||||||||
|
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
-38.16%
|
145/30-20
d=23.43
w=1.71
-36.61%
|
145/35-20
d=24.00
w=2.00
-35.07%
|
145/40-20
d=24.57
w=2.28
-33.53%
|
145/45-20
d=25.14
w=2.57
-31.98%
|
145/50-20
d=25.71
w=2.85
-30.44%
|
145/55-20
d=26.28
w=3.14
-28.89%
|
145/60-20
d=26.85
w=3.43
-27.35%
|
145/65-20
d=27.42
w=3.71
-25.80%
|
145/70-20
d=27.99
w=4.00
-24.26%
|
145/75-20
d=28.56
w=4.28
-22.71%
|
145/80-20
d=29.13
w=4.57
-21.17%
|
145/85-20
d=29.70
w=4.85
-19.62%
|
| 155 |
155/25-20
d=23.05
w=1.53
-37.63%
|
155/30-20
d=23.66
w=1.83
-35.98%
|
155/35-20
d=24.27
w=2.14
-34.32%
|
155/40-20
d=24.88
w=2.44
-32.67%
|
155/45-20
d=25.49
w=2.75
-31.02%
|
155/50-20
d=26.10
w=3.05
-29.37%
|
155/55-20
d=26.71
w=3.36
-27.72%
|
155/60-20
d=27.32
w=3.66
-26.07%
|
155/65-20
d=27.93
w=3.97
-24.42%
|
155/70-20
d=28.54
w=4.27
-22.77%
|
155/75-20
d=29.15
w=4.58
-21.11%
|
155/80-20
d=29.76
w=4.88
-19.46%
|
155/85-20
d=30.37
w=5.19
-17.81%
|
| 165 |
165/25-20
d=23.25
w=1.62
-37.09%
|
165/30-20
d=23.90
w=1.95
-35.34%
|
165/35-20
d=24.55
w=2.27
-33.58%
|
165/40-20
d=25.20
w=2.60
-31.82%
|
165/45-20
d=25.85
w=2.92
-30.06%
|
165/50-20
d=26.50
w=3.25
-28.31%
|
165/55-20
d=27.15
w=3.57
-26.55%
|
165/60-20
d=27.80
w=3.90
-24.79%
|
165/65-20
d=28.44
w=4.22
-23.03%
|
165/70-20
d=29.09
w=4.55
-21.27%
|
165/75-20
d=29.74
w=4.87
-19.52%
|
165/80-20
d=30.39
w=5.20
-17.76%
|
165/85-20
d=31.04
w=5.52
-16.00%
|
| 175 |
175/25-20
d=23.44
w=1.72
-36.56%
|
175/30-20
d=24.13
w=2.07
-34.70%
|
175/35-20
d=24.82
w=2.41
-32.83%
|
175/40-20
d=25.51
w=2.76
-30.97%
|
175/45-20
d=26.20
w=3.10
-29.10%
|
175/50-20
d=26.89
w=3.44
-27.24%
|
175/55-20
d=27.58
w=3.79
-25.38%
|
175/60-20
d=28.27
w=4.13
-23.51%
|
175/65-20
d=28.96
w=4.48
-21.65%
|
175/70-20
d=29.65
w=4.82
-19.78%
|
175/75-20
d=30.33
w=5.17
-17.92%
|
175/80-20
d=31.02
w=5.51
-16.05%
|
175/85-20
d=31.71
w=5.86
-14.19%
|
| 185 |
185/25-20
d=23.64
w=1.82
-36.03%
|
185/30-20
d=24.37
w=2.19
-34.06%
|
185/35-20
d=25.10
w=2.55
-32.09%
|
185/40-20
d=25.83
w=2.91
-30.12%
|
185/45-20
d=26.56
w=3.28
-28.15%
|
185/50-20
d=27.28
w=3.64
-26.17%
|
185/55-20
d=28.01
w=4.01
-24.20%
|
185/60-20
d=28.74
w=4.37
-22.23%
|
185/65-20
d=29.47
w=4.73
-20.26%
|
185/70-20
d=30.20
w=5.10
-18.29%
|
185/75-20
d=30.93
w=5.46
-16.32%
|
185/80-20
d=31.65
w=5.83
-14.35%
|
185/85-20
d=32.38
w=6.19
-12.38%
|
| 195 |
195/25-20
d=23.84
w=1.92
-35.50%
|
195/30-20
d=24.61
w=2.30
-33.42%
|
195/35-20
d=25.37
w=2.69
-31.34%
|
195/40-20
d=26.14
w=3.07
-29.26%
|
195/45-20
d=26.91
w=3.45
-27.19%
|
195/50-20
d=27.68
w=3.84
-25.11%
|
195/55-20
d=28.44
w=4.22
-23.03%
|
195/60-20
d=29.21
w=4.61
-20.95%
|
195/65-20
d=29.98
w=4.99
-18.88%
|
195/70-20
d=30.75
w=5.37
-16.80%
|
195/75-20
d=31.52
w=5.76
-14.72%
|
195/80-20
d=32.28
w=6.14
-12.65%
|
195/85-20
d=33.05
w=6.53
-10.57%
|
| 205 |
205/25-20
d=24.04
w=2.02
-34.96%
|
205/30-20
d=24.84
w=2.42
-32.78%
|
205/35-20
d=25.65
w=2.82
-30.60%
|
205/40-20
d=26.46
w=3.23
-28.41%
|
205/45-20
d=27.26
w=3.63
-26.23%
|
205/50-20
d=28.07
w=4.04
-24.04%
|
205/55-20
d=28.88
w=4.44
-21.86%
|
205/60-20
d=29.69
w=4.84
-19.68%
|
205/65-20
d=30.49
w=5.25
-17.49%
|
205/70-20
d=31.30
w=5.65
-15.31%
|
205/75-20
d=32.11
w=6.05
-13.12%
|
205/80-20
d=32.91
w=6.46
-10.94%
|
205/85-20
d=33.72
w=6.86
-8.76%
|
| 215 |
215/25-20
d=24.23
w=2.12
-34.43%
|
215/30-20
d=25.08
w=2.54
-32.14%
|
215/35-20
d=25.93
w=2.96
-29.85%
|
215/40-20
d=26.77
w=3.39
-27.56%
|
215/45-20
d=27.62
w=3.81
-25.27%
|
215/50-20
d=28.46
w=4.23
-22.98%
|
215/55-20
d=29.31
w=4.66
-20.69%
|
215/60-20
d=30.16
w=5.08
-18.40%
|
215/65-20
d=31.00
w=5.50
-16.11%
|
215/70-20
d=31.85
w=5.93
-13.82%
|
215/75-20
d=32.70
w=6.35
-11.53%
|
215/80-20
d=33.54
w=6.77
-9.24%
|
215/85-20
d=34.39
w=7.19
-6.95%
|
| 225 |
225/25-20
d=24.43
w=2.21
-33.90%
|
225/30-20
d=25.31
w=2.66
-31.50%
|
225/35-20
d=26.20
w=3.10
-29.10%
|
225/40-20
d=27.09
w=3.54
-26.71%
|
225/45-20
d=27.97
w=3.99
-24.31%
|
225/50-20
d=28.86
w=4.43
-21.91%
|
225/55-20
d=29.74
w=4.87
-19.52%
|
225/60-20
d=30.63
w=5.31
-17.12%
|
225/65-20
d=31.52
w=5.76
-14.72%
|
225/70-20
d=32.40
w=6.20
-12.33%
|
225/75-20
d=33.29
w=6.64
-9.93%
|
225/80-20
d=34.17
w=7.09
-7.53%
|
225/85-20
d=35.06
w=7.53
-5.13%
|
| 235 |
235/25-20
d=24.63
w=2.31
-33.37%
|
235/30-20
d=25.55
w=2.78
-30.86%
|
235/35-20
d=26.48
w=3.24
-28.36%
|
235/40-20
d=27.40
w=3.70
-25.85%
|
235/45-20
d=28.33
w=4.16
-23.35%
|
235/50-20
d=29.25
w=4.63
-20.85%
|
235/55-20
d=30.18
w=5.09
-18.34%
|
235/60-20
d=31.10
w=5.55
-15.84%
|
235/65-20
d=32.03
w=6.01
-13.34%
|
235/70-20
d=32.95
w=6.48
-10.83%
|
235/75-20
d=33.88
w=6.94
-8.33%
|
235/80-20
d=34.80
w=7.40
-5.83%
|
235/85-20
d=35.73
w=7.86
-3.32%
|
| 245 |
245/25-20
d=24.82
w=2.41
-32.83%
|
245/30-20
d=25.79
w=2.89
-30.22%
|
245/35-20
d=26.75
w=3.38
-27.61%
|
245/40-20
d=27.72
w=3.86
-25.00%
|
245/45-20
d=28.68
w=4.34
-22.39%
|
245/50-20
d=29.65
w=4.82
-19.78%
|
245/55-20
d=30.61
w=5.31
-17.17%
|
245/60-20
d=31.57
w=5.79
-14.56%
|
245/65-20
d=32.54
w=6.27
-11.95%
|
245/70-20
d=33.50
w=6.75
-9.34%
|
245/75-20
d=34.47
w=7.23
-6.73%
|
245/80-20
d=35.43
w=7.72
-4.12%
|
245/85-20
d=36.40
w=8.20
-1.51%
|
| 255 |
255/25-20
d=25.02
w=2.51
-32.30%
|
255/30-20
d=26.02
w=3.01
-29.58%
|
255/35-20
d=27.03
w=3.51
-26.87%
|
255/40-20
d=28.03
w=4.02
-24.15%
|
255/45-20
d=29.04
w=4.52
-21.43%
|
255/50-20
d=30.04
w=5.02
-18.72%
|
255/55-20
d=31.04
w=5.52
-16.00%
|
255/60-20
d=32.05
w=6.02
-13.28%
|
255/65-20
d=33.05
w=6.53
-10.57%
|
255/70-20
d=34.06
w=7.03
-7.85%
|
255/75-20
d=35.06
w=7.53
-5.13%
|
255/80-20
d=36.06
w=8.03
-2.42%
|
255/85-20
d=37.07
w=8.53
+0.30%
|
| 265 |
265/25-20
d=25.22
w=2.61
-31.77%
|
265/30-20
d=26.26
w=3.13
-28.94%
|
265/35-20
d=27.30
w=3.65
-26.12%
|
265/40-20
d=28.35
w=4.17
-23.30%
|
265/45-20
d=29.39
w=4.69
-20.48%
|
265/50-20
d=30.43
w=5.22
-17.65%
|
265/55-20
d=31.48
w=5.74
-14.83%
|
265/60-20
d=32.52
w=6.26
-12.01%
|
265/65-20
d=33.56
w=6.78
-9.18%
|
265/70-20
d=34.61
w=7.30
-6.36%
|
265/75-20
d=35.65
w=7.82
-3.54%
|
265/80-20
d=36.69
w=8.35
-0.71%
|
265/85-20
d=37.74
w=8.87
+2.11%
|
| 275 |
275/25-20
d=25.41
w=2.71
-31.23%
|
275/30-20
d=26.50
w=3.25
-28.31%
|
275/35-20
d=27.58
w=3.79
-25.38%
|
275/40-20
d=28.66
w=4.33
-22.45%
|
275/45-20
d=29.74
w=4.87
-19.52%
|
275/50-20
d=30.83
w=5.41
-16.59%
|
275/55-20
d=31.91
w=5.95
-13.66%
|
275/60-20
d=32.99
w=6.50
-10.73%
|
275/65-20
d=34.07
w=7.04
-7.80%
|
275/70-20
d=35.16
w=7.58
-4.87%
|
275/75-20
d=36.24
w=8.12
-1.94%
|
275/80-20
d=37.32
w=8.66
+0.99%
|
275/85-20
d=38.41
w=9.20
+3.92%
|
| 285 |
285/25-20
d=25.61
w=2.81
-30.70%
|
285/30-20
d=26.73
w=3.37
-27.67%
|
285/35-20
d=27.85
w=3.93
-24.63%
|
285/40-20
d=28.98
w=4.49
-21.59%
|
285/45-20
d=30.10
w=5.05
-18.56%
|
285/50-20
d=31.22
w=5.61
-15.52%
|
285/55-20
d=32.34
w=6.17
-12.49%
|
285/60-20
d=33.46
w=6.73
-9.45%
|
285/65-20
d=34.59
w=7.29
-6.41%
|
285/70-20
d=35.71
w=7.85
-3.38%
|
285/75-20
d=36.83
w=8.42
-0.34%
|
285/80-20
d=37.95
w=8.98
+2.70%
|
285/85-20
d=39.07
w=9.54
+5.73%
|
| 295 |
295/25-20
d=25.81
w=2.90
-30.17%
|
295/30-20
d=26.97
w=3.48
-27.03%
|
295/35-20
d=28.13
w=4.06
-23.88%
|
295/40-20
d=29.29
w=4.65
-20.74%
|
295/45-20
d=30.45
w=5.23
-17.60%
|
295/50-20
d=31.61
w=5.81
-14.46%
|
295/55-20
d=32.78
w=6.39
-11.31%
|
295/60-20
d=33.94
w=6.97
-8.17%
|
295/65-20
d=35.10
w=7.55
-5.03%
|
295/70-20
d=36.26
w=8.13
-1.89%
|
295/75-20
d=37.42
w=8.71
+1.26%
|
295/80-20
d=38.58
w=9.29
+4.40%
|
295/85-20
d=39.74
w=9.87
+7.54%
|
| 305 |
305/25-20
d=26.00
w=3.00
-29.64%
|
305/30-20
d=27.20
w=3.60
-26.39%
|
305/35-20
d=28.41
w=4.20
-23.14%
|
305/40-20
d=29.61
w=4.80
-19.89%
|
305/45-20
d=30.81
w=5.40
-16.64%
|
305/50-20
d=32.01
w=6.00
-13.39%
|
305/55-20
d=33.21
w=6.60
-10.14%
|
305/60-20
d=34.41
w=7.20
-6.89%
|
305/65-20
d=35.61
w=7.81
-3.64%
|
305/70-20
d=36.81
w=8.41
-0.39%
|
305/75-20
d=38.01
w=9.01
+2.86%
|
305/80-20
d=39.21
w=9.61
+6.10%
|
305/85-20
d=40.41
w=10.21
+9.35%
|
| 315 |
315/25-20
d=26.20
w=3.10
-29.10%
|
315/30-20
d=27.44
w=3.72
-25.75%
|
315/35-20
d=28.68
w=4.34
-22.39%
|
315/40-20
d=29.92
w=4.96
-19.04%
|
315/45-20
d=31.16
w=5.58
-15.68%
|
315/50-20
d=32.40
w=6.20
-12.33%
|
315/55-20
d=33.64
w=6.82
-8.97%
|
315/60-20
d=34.88
w=7.44
-5.61%
|
315/65-20
d=36.12
w=8.06
-2.26%
|
315/70-20
d=37.36
w=8.68
+1.10%
|
315/75-20
d=38.60
w=9.30
+4.45%
|
315/80-20
d=39.84
w=9.92
+7.81%
|
315/85-20
d=41.08
w=10.54
+11.16%
|
| 325 |
325/25-20
d=26.40
w=3.20
-28.57%
|
325/30-20
d=27.68
w=3.84
-25.11%
|
325/35-20
d=28.96
w=4.48
-21.65%
|
325/40-20
d=30.24
w=5.12
-18.18%
|
325/45-20
d=31.52
w=5.76
-14.72%
|
325/50-20
d=32.80
w=6.40
-11.26%
|
325/55-20
d=34.07
w=7.04
-7.80%
|
325/60-20
d=35.35
w=7.68
-4.34%
|
325/65-20
d=36.63
w=8.32
-0.87%
|
325/70-20
d=37.91
w=8.96
+2.59%
|
325/75-20
d=39.19
w=9.60
+6.05%
|
325/80-20
d=40.47
w=10.24
+9.51%
|
325/85-20
d=41.75
w=10.88
+12.98%
|
| 335 |
335/25-20
d=26.59
w=3.30
-28.04%
|
335/30-20
d=27.91
w=3.96
-24.47%
|
335/35-20
d=29.23
w=4.62
-20.90%
|
335/40-20
d=30.55
w=5.28
-17.33%
|
335/45-20
d=31.87
w=5.94
-13.76%
|
335/50-20
d=33.19
w=6.59
-10.19%
|
335/55-20
d=34.51
w=7.25
-6.63%
|
335/60-20
d=35.83
w=7.91
-3.06%
|
335/65-20
d=37.15
w=8.57
+0.51%
|
335/70-20
d=38.46
w=9.23
+4.08%
|
335/75-20
d=39.78
w=9.89
+7.65%
|
335/80-20
d=41.10
w=10.55
+11.22%
|
335/85-20
d=42.42
w=11.21
+14.79%
|
|
Wheel Size 21
|
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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!