| Code | Difference | = 50mph | 1000miles = | Diameter | Wall,in | Wall,mm |
|---|---|---|---|---|---|---|
| 215/85-15 | 0.00 % | 50.00 | 1,000.00 | 29.39 | 7.19 | 182.75 |
| 305/60-15 | +0.07 % | 50.03 | 999.33 | 29.41 | 7.20 | 183.00 |
| 245/75-15 | +0.27 % | 50.13 | 997.32 | 29.47 | 7.23 | 183.75 |
| 335/55-15 | +0.40 % | 50.20 | 995.98 | 29.51 | 7.25 | 184.25 |
| 285/65-15 | +0.67 % | 50.33 | 993.30 | 29.59 | 7.29 | 185.25 |
| 265/70-15 | +0.74 % | 50.37 | 992.63 | 29.61 | 7.30 | 185.50 |
| 225/80-15 | -0.74 % | 49.63 | 1,007.37 | 29.17 | 7.09 | 180.00 |
| 325/55-15 | -1.07 % | 49.46 | 1,010.72 | 29.07 | 7.04 | 178.75 |
| 275/65-15 | -1.07 % | 49.46 | 1,010.72 | 29.07 | 7.04 | 178.75 |
| 255/70-15 | -1.14 % | 49.43 | 1,011.39 | 29.06 | 7.03 | 178.50 |
| 235/80-15 | +1.41 % | 50.70 | 985.93 | 29.80 | 7.40 | 188.00 |
| 295/60-15 | -1.54 % | 49.23 | 1,015.41 | 28.94 | 6.97 | 177.00 |
| 315/60-15 | +1.67 % | 50.84 | 983.26 | 29.88 | 7.44 | 189.00 |
| 235/75-15 | -1.74 % | 49.13 | 1,017.41 | 28.88 | 6.94 | 176.25 |
| 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
|
|||||||||||||
| 145 |
145/25-15
d=17.85
w=1.43
-39.25%
|
145/30-15
d=18.43
w=1.71
-37.31%
|
145/35-15
d=19.00
w=2.00
-35.37%
|
145/40-15
d=19.57
w=2.28
-33.42%
|
145/45-15
d=20.14
w=2.57
-31.48%
|
145/50-15
d=20.71
w=2.85
-29.54%
|
145/55-15
d=21.28
w=3.14
-27.60%
|
145/60-15
d=21.85
w=3.43
-25.65%
|
145/65-15
d=22.42
w=3.71
-23.71%
|
145/70-15
d=22.99
w=4.00
-21.77%
|
145/75-15
d=23.56
w=4.28
-19.83%
|
145/80-15
d=24.13
w=4.57
-17.88%
|
145/85-15
d=24.70
w=4.85
-15.94%
|
| 155 |
155/25-15
d=18.05
w=1.53
-38.58%
|
155/30-15
d=18.66
w=1.83
-36.50%
|
155/35-15
d=19.27
w=2.14
-34.43%
|
155/40-15
d=19.88
w=2.44
-32.35%
|
155/45-15
d=20.49
w=2.75
-30.27%
|
155/50-15
d=21.10
w=3.05
-28.20%
|
155/55-15
d=21.71
w=3.36
-26.12%
|
155/60-15
d=22.32
w=3.66
-24.05%
|
155/65-15
d=22.93
w=3.97
-21.97%
|
155/70-15
d=23.54
w=4.27
-19.89%
|
155/75-15
d=24.15
w=4.58
-17.82%
|
155/80-15
d=24.76
w=4.88
-15.74%
|
155/85-15
d=25.37
w=5.19
-13.66%
|
| 165 |
165/25-15
d=18.25
w=1.62
-37.91%
|
165/30-15
d=18.90
w=1.95
-35.70%
|
165/35-15
d=19.55
w=2.27
-33.49%
|
165/40-15
d=20.20
w=2.60
-31.28%
|
165/45-15
d=20.85
w=2.92
-29.07%
|
165/50-15
d=21.50
w=3.25
-26.86%
|
165/55-15
d=22.15
w=3.57
-24.65%
|
165/60-15
d=22.80
w=3.90
-22.44%
|
165/65-15
d=23.44
w=4.22
-20.23%
|
165/70-15
d=24.09
w=4.55
-18.02%
|
165/75-15
d=24.74
w=4.87
-15.81%
|
165/80-15
d=25.39
w=5.20
-13.60%
|
165/85-15
d=26.04
w=5.52
-11.39%
|
| 175 |
175/25-15
d=18.44
w=1.72
-37.24%
|
175/30-15
d=19.13
w=2.07
-34.90%
|
175/35-15
d=19.82
w=2.41
-32.55%
|
175/40-15
d=20.51
w=2.76
-30.21%
|
175/45-15
d=21.20
w=3.10
-27.86%
|
175/50-15
d=21.89
w=3.44
-25.52%
|
175/55-15
d=22.58
w=3.79
-23.17%
|
175/60-15
d=23.27
w=4.13
-20.83%
|
175/65-15
d=23.96
w=4.48
-18.49%
|
175/70-15
d=24.65
w=4.82
-16.14%
|
175/75-15
d=25.33
w=5.17
-13.80%
|
175/80-15
d=26.02
w=5.51
-11.45%
|
175/85-15
d=26.71
w=5.86
-9.11%
|
| 185 |
185/25-15
d=18.64
w=1.82
-36.57%
|
185/30-15
d=19.37
w=2.19
-34.09%
|
185/35-15
d=20.10
w=2.55
-31.61%
|
185/40-15
d=20.83
w=2.91
-29.14%
|
185/45-15
d=21.56
w=3.28
-26.66%
|
185/50-15
d=22.28
w=3.64
-24.18%
|
185/55-15
d=23.01
w=4.01
-21.70%
|
185/60-15
d=23.74
w=4.37
-19.22%
|
185/65-15
d=24.47
w=4.73
-16.74%
|
185/70-15
d=25.20
w=5.10
-14.27%
|
185/75-15
d=25.93
w=5.46
-11.79%
|
185/80-15
d=26.65
w=5.83
-9.31%
|
185/85-15
d=27.38
w=6.19
-6.83%
|
| 195 |
195/25-15
d=18.84
w=1.92
-35.90%
|
195/30-15
d=19.61
w=2.30
-33.29%
|
195/35-15
d=20.37
w=2.69
-30.68%
|
195/40-15
d=21.14
w=3.07
-28.06%
|
195/45-15
d=21.91
w=3.45
-25.45%
|
195/50-15
d=22.68
w=3.84
-22.84%
|
195/55-15
d=23.44
w=4.22
-20.23%
|
195/60-15
d=24.21
w=4.61
-17.62%
|
195/65-15
d=24.98
w=4.99
-15.00%
|
195/70-15
d=25.75
w=5.37
-12.39%
|
195/75-15
d=26.52
w=5.76
-9.78%
|
195/80-15
d=27.28
w=6.14
-7.17%
|
195/85-15
d=28.05
w=6.53
-4.55%
|
| 205 |
205/25-15
d=19.04
w=2.02
-35.23%
|
205/30-15
d=19.84
w=2.42
-32.48%
|
205/35-15
d=20.65
w=2.82
-29.74%
|
205/40-15
d=21.46
w=3.23
-26.99%
|
205/45-15
d=22.26
w=3.63
-24.25%
|
205/50-15
d=23.07
w=4.04
-21.50%
|
205/55-15
d=23.88
w=4.44
-18.75%
|
205/60-15
d=24.69
w=4.84
-16.01%
|
205/65-15
d=25.49
w=5.25
-13.26%
|
205/70-15
d=26.30
w=5.65
-10.52%
|
205/75-15
d=27.11
w=6.05
-7.77%
|
205/80-15
d=27.91
w=6.46
-5.02%
|
205/85-15
d=28.72
w=6.86
-2.28%
|
| 215 |
215/25-15
d=19.23
w=2.12
-34.56%
|
215/30-15
d=20.08
w=2.54
-31.68%
|
215/35-15
d=20.93
w=2.96
-28.80%
|
215/40-15
d=21.77
w=3.39
-25.92%
|
215/45-15
d=22.62
w=3.81
-23.04%
|
215/50-15
d=23.46
w=4.23
-20.16%
|
215/55-15
d=24.31
w=4.66
-17.28%
|
215/60-15
d=25.16
w=5.08
-14.40%
|
215/65-15
d=26.00
w=5.50
-11.52%
|
215/70-15
d=26.85
w=5.93
-8.64%
|
215/75-15
d=27.70
w=6.35
-5.76%
|
215/80-15
d=28.54
w=6.77
-2.88%
|
215/85-15
d=29.39
w=7.19
0.00%
|
| 225 |
225/25-15
d=19.43
w=2.21
-33.89%
|
225/30-15
d=20.31
w=2.66
-30.88%
|
225/35-15
d=21.20
w=3.10
-27.86%
|
225/40-15
d=22.09
w=3.54
-24.85%
|
225/45-15
d=22.97
w=3.99
-21.84%
|
225/50-15
d=23.86
w=4.43
-18.82%
|
225/55-15
d=24.74
w=4.87
-15.81%
|
225/60-15
d=25.63
w=5.31
-12.79%
|
225/65-15
d=26.52
w=5.76
-9.78%
|
225/70-15
d=27.40
w=6.20
-6.76%
|
225/75-15
d=28.29
w=6.64
-3.75%
|
225/80-15
d=29.17
w=7.09
-0.74%
|
225/85-15
d=30.06
w=7.53
+2.28%
|
| 235 |
235/25-15
d=19.63
w=2.31
-33.22%
|
235/30-15
d=20.55
w=2.78
-30.07%
|
235/35-15
d=21.48
w=3.24
-26.93%
|
235/40-15
d=22.40
w=3.70
-23.78%
|
235/45-15
d=23.33
w=4.16
-20.63%
|
235/50-15
d=24.25
w=4.63
-17.48%
|
235/55-15
d=25.18
w=5.09
-14.33%
|
235/60-15
d=26.10
w=5.55
-11.19%
|
235/65-15
d=27.03
w=6.01
-8.04%
|
235/70-15
d=27.95
w=6.48
-4.89%
|
235/75-15
d=28.88
w=6.94
-1.74%
|
235/80-15
d=29.80
w=7.40
+1.41%
|
235/85-15
d=30.73
w=7.86
+4.55%
|
| 245 |
245/25-15
d=19.82
w=2.41
-32.55%
|
245/30-15
d=20.79
w=2.89
-29.27%
|
245/35-15
d=21.75
w=3.38
-25.99%
|
245/40-15
d=22.72
w=3.86
-22.71%
|
245/45-15
d=23.68
w=4.34
-19.42%
|
245/50-15
d=24.65
w=4.82
-16.14%
|
245/55-15
d=25.61
w=5.31
-12.86%
|
245/60-15
d=26.57
w=5.79
-9.58%
|
245/65-15
d=27.54
w=6.27
-6.30%
|
245/70-15
d=28.50
w=6.75
-3.01%
|
245/75-15
d=29.47
w=7.23
+0.27%
|
245/80-15
d=30.43
w=7.72
+3.55%
|
245/85-15
d=31.40
w=8.20
+6.83%
|
| 255 |
255/25-15
d=20.02
w=2.51
-31.88%
|
255/30-15
d=21.02
w=3.01
-28.47%
|
255/35-15
d=22.03
w=3.51
-25.05%
|
255/40-15
d=23.03
w=4.02
-21.63%
|
255/45-15
d=24.04
w=4.52
-18.22%
|
255/50-15
d=25.04
w=5.02
-14.80%
|
255/55-15
d=26.04
w=5.52
-11.39%
|
255/60-15
d=27.05
w=6.02
-7.97%
|
255/65-15
d=28.05
w=6.53
-4.55%
|
255/70-15
d=29.06
w=7.03
-1.14%
|
255/75-15
d=30.06
w=7.53
+2.28%
|
255/80-15
d=31.06
w=8.03
+5.69%
|
255/85-15
d=32.07
w=8.53
+9.11%
|
| 265 |
265/25-15
d=20.22
w=2.61
-31.21%
|
265/30-15
d=21.26
w=3.13
-27.66%
|
265/35-15
d=22.30
w=3.65
-24.11%
|
265/40-15
d=23.35
w=4.17
-20.56%
|
265/45-15
d=24.39
w=4.69
-17.01%
|
265/50-15
d=25.43
w=5.22
-13.46%
|
265/55-15
d=26.48
w=5.74
-9.91%
|
265/60-15
d=27.52
w=6.26
-6.36%
|
265/65-15
d=28.56
w=6.78
-2.81%
|
265/70-15
d=29.61
w=7.30
+0.74%
|
265/75-15
d=30.65
w=7.82
+4.29%
|
265/80-15
d=31.69
w=8.35
+7.84%
|
265/85-15
d=32.74
w=8.87
+11.39%
|
| 275 |
275/25-15
d=20.41
w=2.71
-30.54%
|
275/30-15
d=21.50
w=3.25
-26.86%
|
275/35-15
d=22.58
w=3.79
-23.17%
|
275/40-15
d=23.66
w=4.33
-19.49%
|
275/45-15
d=24.74
w=4.87
-15.81%
|
275/50-15
d=25.83
w=5.41
-12.12%
|
275/55-15
d=26.91
w=5.95
-8.44%
|
275/60-15
d=27.99
w=6.50
-4.76%
|
275/65-15
d=29.07
w=7.04
-1.07%
|
275/70-15
d=30.16
w=7.58
+2.61%
|
275/75-15
d=31.24
w=8.12
+6.30%
|
275/80-15
d=32.32
w=8.66
+9.98%
|
275/85-15
d=33.41
w=9.20
+13.66%
|
| 285 |
285/25-15
d=20.61
w=2.81
-29.87%
|
285/30-15
d=21.73
w=3.37
-26.05%
|
285/35-15
d=22.85
w=3.93
-22.24%
|
285/40-15
d=23.98
w=4.49
-18.42%
|
285/45-15
d=25.10
w=5.05
-14.60%
|
285/50-15
d=26.22
w=5.61
-10.78%
|
285/55-15
d=27.34
w=6.17
-6.97%
|
285/60-15
d=28.46
w=6.73
-3.15%
|
285/65-15
d=29.59
w=7.29
+0.67%
|
285/70-15
d=30.71
w=7.85
+4.49%
|
285/75-15
d=31.83
w=8.42
+8.31%
|
285/80-15
d=32.95
w=8.98
+12.12%
|
285/85-15
d=34.07
w=9.54
+15.94%
|
| 295 |
295/25-15
d=20.81
w=2.90
-29.20%
|
295/30-15
d=21.97
w=3.48
-25.25%
|
295/35-15
d=23.13
w=4.06
-21.30%
|
295/40-15
d=24.29
w=4.65
-17.35%
|
295/45-15
d=25.45
w=5.23
-13.40%
|
295/50-15
d=26.61
w=5.81
-9.44%
|
295/55-15
d=27.78
w=6.39
-5.49%
|
295/60-15
d=28.94
w=6.97
-1.54%
|
295/65-15
d=30.10
w=7.55
+2.41%
|
295/70-15
d=31.26
w=8.13
+6.36%
|
295/75-15
d=32.42
w=8.71
+10.31%
|
295/80-15
d=33.58
w=9.29
+14.27%
|
295/85-15
d=34.74
w=9.87
+18.22%
|
| 305 |
305/25-15
d=21.00
w=3.00
-28.53%
|
305/30-15
d=22.20
w=3.60
-24.45%
|
305/35-15
d=23.41
w=4.20
-20.36%
|
305/40-15
d=24.61
w=4.80
-16.28%
|
305/45-15
d=25.81
w=5.40
-12.19%
|
305/50-15
d=27.01
w=6.00
-8.10%
|
305/55-15
d=28.21
w=6.60
-4.02%
|
305/60-15
d=29.41
w=7.20
+0.07%
|
305/65-15
d=30.61
w=7.81
+4.15%
|
305/70-15
d=31.81
w=8.41
+8.24%
|
305/75-15
d=33.01
w=9.01
+12.32%
|
305/80-15
d=34.21
w=9.61
+16.41%
|
305/85-15
d=35.41
w=10.21
+20.50%
|
| 315 |
315/25-15
d=21.20
w=3.10
-27.86%
|
315/30-15
d=22.44
w=3.72
-23.64%
|
315/35-15
d=23.68
w=4.34
-19.42%
|
315/40-15
d=24.92
w=4.96
-15.20%
|
315/45-15
d=26.16
w=5.58
-10.98%
|
315/50-15
d=27.40
w=6.20
-6.76%
|
315/55-15
d=28.64
w=6.82
-2.55%
|
315/60-15
d=29.88
w=7.44
+1.67%
|
315/65-15
d=31.12
w=8.06
+5.89%
|
315/70-15
d=32.36
w=8.68
+10.11%
|
315/75-15
d=33.60
w=9.30
+14.33%
|
315/80-15
d=34.84
w=9.92
+18.55%
|
315/85-15
d=36.08
w=10.54
+22.77%
|
| 325 |
325/25-15
d=21.40
w=3.20
-27.19%
|
325/30-15
d=22.68
w=3.84
-22.84%
|
325/35-15
d=23.96
w=4.48
-18.49%
|
325/40-15
d=25.24
w=5.12
-14.13%
|
325/45-15
d=26.52
w=5.76
-9.78%
|
325/50-15
d=27.80
w=6.40
-5.43%
|
325/55-15
d=29.07
w=7.04
-1.07%
|
325/60-15
d=30.35
w=7.68
+3.28%
|
325/65-15
d=31.63
w=8.32
+7.64%
|
325/70-15
d=32.91
w=8.96
+11.99%
|
325/75-15
d=34.19
w=9.60
+16.34%
|
325/80-15
d=35.47
w=10.24
+20.70%
|
325/85-15
d=36.75
w=10.88
+25.05%
|
| 335 |
335/25-15
d=21.59
w=3.30
-26.52%
|
335/30-15
d=22.91
w=3.96
-22.04%
|
335/35-15
d=24.23
w=4.62
-17.55%
|
335/40-15
d=25.55
w=5.28
-13.06%
|
335/45-15
d=26.87
w=5.94
-8.57%
|
335/50-15
d=28.19
w=6.59
-4.09%
|
335/55-15
d=29.51
w=7.25
+0.40%
|
335/60-15
d=30.83
w=7.91
+4.89%
|
335/65-15
d=32.15
w=8.57
+9.38%
|
335/70-15
d=33.46
w=9.23
+13.86%
|
335/75-15
d=34.78
w=9.89
+18.35%
|
335/80-15
d=36.10
w=10.55
+22.84%
|
335/85-15
d=37.42
w=11.21
+27.33%
|
|
Wheel Size 16
|
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Wheel Size 16.5
|
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Wheel Size 17
|
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Wheel Size 18
|
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|
Wheel Size 19
|
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|
Wheel Size 20
|
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|
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!