| Code | Difference | = 50mph | 1000miles = | Diameter | Wall,in | Wall,mm |
|---|---|---|---|---|---|---|
| 145/80-16 | 0.00 % | 50.00 | 1,000.00 | 25.13 | 4.57 | 116.00 |
| 155/75-16 | +0.08 % | 50.04 | 999.22 | 25.15 | 4.58 | 116.25 |
| 215/60-15 | +0.09 % | 50.05 | 999.06 | 25.16 | 5.08 | 129.00 |
| 315/45-14 | +0.11 % | 50.05 | 998.90 | 25.16 | 5.58 | 141.75 |
| 235/60-14 | -0.13 % | 49.94 | 1,001.25 | 25.10 | 5.55 | 141.00 |
| 285/45-15 | -0.14 % | 49.93 | 1,001.41 | 25.10 | 5.05 | 128.25 |
| 165/70-16 | -0.16 % | 49.92 | 1,001.57 | 25.09 | 4.55 | 115.50 |
| 235/55-15 | +0.17 % | 50.09 | 998.28 | 25.18 | 5.09 | 129.25 |
| 185/70-15 | +0.25 % | 50.13 | 997.49 | 25.20 | 5.10 | 129.50 |
| 195/60-16 | +0.31 % | 50.16 | 996.87 | 25.21 | 4.61 | 117.00 |
| 285/50-14 | +0.34 % | 50.17 | 996.55 | 25.22 | 5.61 | 142.50 |
| 255/55-14 | -0.36 % | 49.82 | 1,003.60 | 25.04 | 5.52 | 140.25 |
| 165/85-14 | -0.36 % | 49.82 | 1,003.60 | 25.04 | 5.52 | 140.25 |
| 255/50-15 | -0.38 % | 49.81 | 1,003.76 | 25.04 | 5.02 | 127.50 |
| 255/45-16 | -0.39 % | 49.80 | 1,003.92 | 25.04 | 4.52 | 114.75 |
| 335/35-16 | +0.39 % | 50.20 | 996.08 | 25.23 | 4.62 | 117.25 |
| 325/40-15 | +0.41 % | 50.20 | 995.93 | 25.24 | 5.12 | 130.00 |
| 175/80-14 | -0.44 % | 49.78 | 1,004.39 | 25.02 | 5.51 | 140.00 |
| 235/50-16 | +0.47 % | 50.23 | 995.30 | 25.25 | 4.63 | 117.50 |
| 215/65-14 | -0.52 % | 49.74 | 1,005.17 | 25.00 | 5.50 | 139.75 |
| 195/65-15 | -0.61 % | 49.69 | 1,006.11 | 24.98 | 4.99 | 126.75 |
| 285/40-16 | -0.63 % | 49.69 | 1,006.27 | 24.98 | 4.49 | 114.00 |
| 295/40-16 | +0.63 % | 50.31 | 993.73 | 25.29 | 4.65 | 118.00 |
| 205/70-14 | +0.66 % | 50.33 | 993.42 | 25.30 | 5.65 | 143.50 |
| 325/35-16 | -0.70 % | 49.65 | 1,007.05 | 24.96 | 4.48 | 113.75 |
| 175/65-16 | -0.70 % | 49.65 | 1,007.05 | 24.96 | 4.48 | 113.75 |
| 215/55-16 | +0.70 % | 50.35 | 992.95 | 25.31 | 4.66 | 118.25 |
| 175/75-15 | +0.80 % | 50.40 | 992.01 | 25.33 | 5.17 | 131.25 |
| 185/75-14 | -0.83 % | 49.58 | 1,008.30 | 24.93 | 5.46 | 138.75 |
| 315/40-15 | -0.85 % | 49.58 | 1,008.46 | 24.92 | 4.96 | 126.00 |
| 155/85-15 | +0.96 % | 50.48 | 990.44 | 25.37 | 5.19 | 131.75 |
| 205/55-16 | -1.02 % | 49.49 | 1,010.18 | 24.88 | 4.44 | 112.75 |
| 265/45-16 | +1.02 % | 50.51 | 989.82 | 25.39 | 4.69 | 119.25 |
| 165/80-15 | +1.03 % | 50.52 | 989.66 | 25.39 | 5.20 | 132.00 |
| 225/50-16 | -1.10 % | 49.45 | 1,010.96 | 24.86 | 4.43 | 112.50 |
| 265/50-15 | +1.19 % | 50.60 | 988.10 | 25.43 | 5.22 | 132.50 |
| 275/50-14 | -1.22 % | 49.39 | 1,012.22 | 24.83 | 5.41 | 137.50 |
| 295/45-15 | +1.27 % | 50.63 | 987.31 | 25.45 | 5.23 | 132.75 |
| 305/45-14 | -1.30 % | 49.35 | 1,013.00 | 24.81 | 5.40 | 137.25 |
| 185/65-16 | +1.33 % | 50.67 | 986.69 | 25.47 | 4.73 | 120.25 |
| 265/55-14 | +1.36 % | 50.68 | 986.37 | 25.48 | 5.74 | 145.75 |
| 205/65-15 | +1.43 % | 50.71 | 985.75 | 25.49 | 5.25 | 133.25 |
| 155/80-15 | -1.47 % | 49.26 | 1,014.72 | 24.76 | 4.88 | 124.00 |
| 325/45-14 | +1.52 % | 50.76 | 984.81 | 25.52 | 5.76 | 146.25 |
| 225/65-14 | +1.52 % | 50.76 | 984.81 | 25.52 | 5.76 | 146.25 |
| 195/75-14 | +1.52 % | 50.76 | 984.81 | 25.52 | 5.76 | 146.25 |
| 195/70-14 | -1.54 % | 49.23 | 1,015.35 | 24.75 | 5.37 | 136.50 |
| 275/45-15 | -1.55 % | 49.22 | 1,015.51 | 24.74 | 4.87 | 123.75 |
| 225/55-15 | -1.55 % | 49.22 | 1,015.51 | 24.74 | 4.87 | 123.75 |
| 165/75-15 | -1.55 % | 49.22 | 1,015.51 | 24.74 | 4.87 | 123.75 |
| 185/60-16 | -1.57 % | 49.22 | 1,015.66 | 24.74 | 4.37 | 111.00 |
| 335/40-15 | +1.66 % | 50.83 | 983.40 | 25.55 | 5.28 | 134.00 |
| 145/85-15 | -1.71 % | 49.15 | 1,017.07 | 24.70 | 4.85 | 123.25 |
| 245/60-14 | +1.75 % | 50.88 | 982.46 | 25.57 | 5.79 | 147.00 |
| 205/60-15 | -1.79 % | 49.11 | 1,017.86 | 24.69 | 4.84 | 123.00 |
| 315/35-16 | -1.80 % | 49.10 | 1,018.01 | 24.68 | 4.34 | 110.25 |
| 245/45-16 | -1.80 % | 49.10 | 1,018.01 | 24.68 | 4.34 | 110.25 |
| 275/40-16 | -1.88 % | 49.06 | 1,018.80 | 24.66 | 4.33 | 110.00 |
| 305/40-16 | +1.88 % | 50.94 | 981.20 | 25.61 | 4.80 | 122.00 |
| 245/55-15 | +1.90 % | 50.95 | 981.05 | 25.61 | 5.31 | 134.75 |
| 295/50-14 | +1.91 % | 50.96 | 980.89 | 25.61 | 5.81 | 147.50 |
| 245/50-15 | -1.94 % | 49.03 | 1,019.42 | 24.65 | 4.82 | 122.50 |
| 175/70-15 | -1.94 % | 49.03 | 1,019.42 | 24.65 | 4.82 | 122.50 |
| 225/60-15 | +1.97 % | 50.99 | 980.26 | 25.63 | 5.31 | 135.00 |
| Ratio: | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Wheel Size 14
|
|||||||||||||
|
Wheel Size 15
|
|||||||||||||
| 145 |
145/25-15
d=17.85
w=1.43
-28.96%
|
145/30-15
d=18.43
w=1.71
-26.69%
|
145/35-15
d=19.00
w=2.00
-24.42%
|
145/40-15
d=19.57
w=2.28
-22.15%
|
145/45-15
d=20.14
w=2.57
-19.88%
|
145/50-15
d=20.71
w=2.85
-17.61%
|
145/55-15
d=21.28
w=3.14
-15.34%
|
145/60-15
d=21.85
w=3.43
-13.06%
|
145/65-15
d=22.42
w=3.71
-10.79%
|
145/70-15
d=22.99
w=4.00
-8.52%
|
145/75-15
d=23.56
w=4.28
-6.25%
|
145/80-15
d=24.13
w=4.57
-3.98%
|
145/85-15
d=24.70
w=4.85
-1.71%
|
| 155 |
155/25-15
d=18.05
w=1.53
-28.18%
|
155/30-15
d=18.66
w=1.83
-25.75%
|
155/35-15
d=19.27
w=2.14
-23.32%
|
155/40-15
d=19.88
w=2.44
-20.90%
|
155/45-15
d=20.49
w=2.75
-18.47%
|
155/50-15
d=21.10
w=3.05
-16.04%
|
155/55-15
d=21.71
w=3.36
-13.61%
|
155/60-15
d=22.32
w=3.66
-11.18%
|
155/65-15
d=22.93
w=3.97
-8.76%
|
155/70-15
d=23.54
w=4.27
-6.33%
|
155/75-15
d=24.15
w=4.58
-3.90%
|
155/80-15
d=24.76
w=4.88
-1.47%
|
155/85-15
d=25.37
w=5.19
+0.96%
|
| 165 |
165/25-15
d=18.25
w=1.62
-27.40%
|
165/30-15
d=18.90
w=1.95
-24.81%
|
165/35-15
d=19.55
w=2.27
-22.23%
|
165/40-15
d=20.20
w=2.60
-19.64%
|
165/45-15
d=20.85
w=2.92
-17.06%
|
165/50-15
d=21.50
w=3.25
-14.47%
|
165/55-15
d=22.15
w=3.57
-11.89%
|
165/60-15
d=22.80
w=3.90
-9.30%
|
165/65-15
d=23.44
w=4.22
-6.72%
|
165/70-15
d=24.09
w=4.55
-4.14%
|
165/75-15
d=24.74
w=4.87
-1.55%
|
165/80-15
d=25.39
w=5.20
+1.03%
|
165/85-15
d=26.04
w=5.52
+3.62%
|
| 175 |
175/25-15
d=18.44
w=1.72
-26.61%
|
175/30-15
d=19.13
w=2.07
-23.87%
|
175/35-15
d=19.82
w=2.41
-21.13%
|
175/40-15
d=20.51
w=2.76
-18.39%
|
175/45-15
d=21.20
w=3.10
-15.65%
|
175/50-15
d=21.89
w=3.44
-12.91%
|
175/55-15
d=22.58
w=3.79
-10.17%
|
175/60-15
d=23.27
w=4.13
-7.42%
|
175/65-15
d=23.96
w=4.48
-4.68%
|
175/70-15
d=24.65
w=4.82
-1.94%
|
175/75-15
d=25.33
w=5.17
+0.80%
|
175/80-15
d=26.02
w=5.51
+3.54%
|
175/85-15
d=26.71
w=5.86
+6.28%
|
| 185 |
185/25-15
d=18.64
w=1.82
-25.83%
|
185/30-15
d=19.37
w=2.19
-22.93%
|
185/35-15
d=20.10
w=2.55
-20.03%
|
185/40-15
d=20.83
w=2.91
-17.14%
|
185/45-15
d=21.56
w=3.28
-14.24%
|
185/50-15
d=22.28
w=3.64
-11.34%
|
185/55-15
d=23.01
w=4.01
-8.44%
|
185/60-15
d=23.74
w=4.37
-5.55%
|
185/65-15
d=24.47
w=4.73
-2.65%
|
185/70-15
d=25.20
w=5.10
+0.25%
|
185/75-15
d=25.93
w=5.46
+3.15%
|
185/80-15
d=26.65
w=5.83
+6.05%
|
185/85-15
d=27.38
w=6.19
+8.94%
|
| 195 |
195/25-15
d=18.84
w=1.92
-25.05%
|
195/30-15
d=19.61
w=2.30
-21.99%
|
195/35-15
d=20.37
w=2.69
-18.94%
|
195/40-15
d=21.14
w=3.07
-15.88%
|
195/45-15
d=21.91
w=3.45
-12.83%
|
195/50-15
d=22.68
w=3.84
-9.77%
|
195/55-15
d=23.44
w=4.22
-6.72%
|
195/60-15
d=24.21
w=4.61
-3.67%
|
195/65-15
d=24.98
w=4.99
-0.61%
|
195/70-15
d=25.75
w=5.37
+2.44%
|
195/75-15
d=26.52
w=5.76
+5.50%
|
195/80-15
d=27.28
w=6.14
+8.55%
|
195/85-15
d=28.05
w=6.53
+11.61%
|
| 205 |
205/25-15
d=19.04
w=2.02
-24.26%
|
205/30-15
d=19.84
w=2.42
-21.05%
|
205/35-15
d=20.65
w=2.82
-17.84%
|
205/40-15
d=21.46
w=3.23
-14.63%
|
205/45-15
d=22.26
w=3.63
-11.42%
|
205/50-15
d=23.07
w=4.04
-8.21%
|
205/55-15
d=23.88
w=4.44
-5.00%
|
205/60-15
d=24.69
w=4.84
-1.79%
|
205/65-15
d=25.49
w=5.25
+1.43%
|
205/70-15
d=26.30
w=5.65
+4.64%
|
205/75-15
d=27.11
w=6.05
+7.85%
|
205/80-15
d=27.91
w=6.46
+11.06%
|
205/85-15
d=28.72
w=6.86
+14.27%
|
| 215 |
215/25-15
d=19.23
w=2.12
-23.48%
|
215/30-15
d=20.08
w=2.54
-20.11%
|
215/35-15
d=20.93
w=2.96
-16.74%
|
215/40-15
d=21.77
w=3.39
-13.38%
|
215/45-15
d=22.62
w=3.81
-10.01%
|
215/50-15
d=23.46
w=4.23
-6.64%
|
215/55-15
d=24.31
w=4.66
-3.27%
|
215/60-15
d=25.16
w=5.08
+0.09%
|
215/65-15
d=26.00
w=5.50
+3.46%
|
215/70-15
d=26.85
w=5.93
+6.83%
|
215/75-15
d=27.70
w=6.35
+10.20%
|
215/80-15
d=28.54
w=6.77
+13.57%
|
215/85-15
d=29.39
w=7.19
+16.93%
|
| 225 |
225/25-15
d=19.43
w=2.21
-22.70%
|
225/30-15
d=20.31
w=2.66
-19.17%
|
225/35-15
d=21.20
w=3.10
-15.65%
|
225/40-15
d=22.09
w=3.54
-12.12%
|
225/45-15
d=22.97
w=3.99
-8.60%
|
225/50-15
d=23.86
w=4.43
-5.08%
|
225/55-15
d=24.74
w=4.87
-1.55%
|
225/60-15
d=25.63
w=5.31
+1.97%
|
225/65-15
d=26.52
w=5.76
+5.50%
|
225/70-15
d=27.40
w=6.20
+9.02%
|
225/75-15
d=28.29
w=6.64
+12.55%
|
225/80-15
d=29.17
w=7.09
+16.07%
|
225/85-15
d=30.06
w=7.53
+19.60%
|
| 235 |
235/25-15
d=19.63
w=2.31
-21.91%
|
235/30-15
d=20.55
w=2.78
-18.23%
|
235/35-15
d=21.48
w=3.24
-14.55%
|
235/40-15
d=22.40
w=3.70
-10.87%
|
235/45-15
d=23.33
w=4.16
-7.19%
|
235/50-15
d=24.25
w=4.63
-3.51%
|
235/55-15
d=25.18
w=5.09
+0.17%
|
235/60-15
d=26.10
w=5.55
+3.85%
|
235/65-15
d=27.03
w=6.01
+7.53%
|
235/70-15
d=27.95
w=6.48
+11.22%
|
235/75-15
d=28.88
w=6.94
+14.90%
|
235/80-15
d=29.80
w=7.40
+18.58%
|
235/85-15
d=30.73
w=7.86
+22.26%
|
| 245 |
245/25-15
d=19.82
w=2.41
-21.13%
|
245/30-15
d=20.79
w=2.89
-17.29%
|
245/35-15
d=21.75
w=3.38
-13.46%
|
245/40-15
d=22.72
w=3.86
-9.62%
|
245/45-15
d=23.68
w=4.34
-5.78%
|
245/50-15
d=24.65
w=4.82
-1.94%
|
245/55-15
d=25.61
w=5.31
+1.90%
|
245/60-15
d=26.57
w=5.79
+5.73%
|
245/65-15
d=27.54
w=6.27
+9.57%
|
245/70-15
d=28.50
w=6.75
+13.41%
|
245/75-15
d=29.47
w=7.23
+17.25%
|
245/80-15
d=30.43
w=7.72
+21.08%
|
245/85-15
d=31.40
w=8.20
+24.92%
|
| 255 |
255/25-15
d=20.02
w=2.51
-20.35%
|
255/30-15
d=21.02
w=3.01
-16.35%
|
255/35-15
d=22.03
w=3.51
-12.36%
|
255/40-15
d=23.03
w=4.02
-8.36%
|
255/45-15
d=24.04
w=4.52
-4.37%
|
255/50-15
d=25.04
w=5.02
-0.38%
|
255/55-15
d=26.04
w=5.52
+3.62%
|
255/60-15
d=27.05
w=6.02
+7.61%
|
255/65-15
d=28.05
w=6.53
+11.61%
|
255/70-15
d=29.06
w=7.03
+15.60%
|
255/75-15
d=30.06
w=7.53
+19.60%
|
255/80-15
d=31.06
w=8.03
+23.59%
|
255/85-15
d=32.07
w=8.53
+27.58%
|
| 265 |
265/25-15
d=20.22
w=2.61
-19.56%
|
265/30-15
d=21.26
w=3.13
-15.41%
|
265/35-15
d=22.30
w=3.65
-11.26%
|
265/40-15
d=23.35
w=4.17
-7.11%
|
265/45-15
d=24.39
w=4.69
-2.96%
|
265/50-15
d=25.43
w=5.22
+1.19%
|
265/55-15
d=26.48
w=5.74
+5.34%
|
265/60-15
d=27.52
w=6.26
+9.49%
|
265/65-15
d=28.56
w=6.78
+13.64%
|
265/70-15
d=29.61
w=7.30
+17.79%
|
265/75-15
d=30.65
w=7.82
+21.95%
|
265/80-15
d=31.69
w=8.35
+26.10%
|
265/85-15
d=32.74
w=8.87
+30.25%
|
| 275 |
275/25-15
d=20.41
w=2.71
-18.78%
|
275/30-15
d=21.50
w=3.25
-14.47%
|
275/35-15
d=22.58
w=3.79
-10.17%
|
275/40-15
d=23.66
w=4.33
-5.86%
|
275/45-15
d=24.74
w=4.87
-1.55%
|
275/50-15
d=25.83
w=5.41
+2.76%
|
275/55-15
d=26.91
w=5.95
+7.06%
|
275/60-15
d=27.99
w=6.50
+11.37%
|
275/65-15
d=29.07
w=7.04
+15.68%
|
275/70-15
d=30.16
w=7.58
+19.99%
|
275/75-15
d=31.24
w=8.12
+24.30%
|
275/80-15
d=32.32
w=8.66
+28.60%
|
275/85-15
d=33.41
w=9.20
+32.91%
|
| 285 |
285/25-15
d=20.61
w=2.81
-18.00%
|
285/30-15
d=21.73
w=3.37
-13.53%
|
285/35-15
d=22.85
w=3.93
-9.07%
|
285/40-15
d=23.98
w=4.49
-4.61%
|
285/45-15
d=25.10
w=5.05
-0.14%
|
285/50-15
d=26.22
w=5.61
+4.32%
|
285/55-15
d=27.34
w=6.17
+8.79%
|
285/60-15
d=28.46
w=6.73
+13.25%
|
285/65-15
d=29.59
w=7.29
+17.72%
|
285/70-15
d=30.71
w=7.85
+22.18%
|
285/75-15
d=31.83
w=8.42
+26.64%
|
285/80-15
d=32.95
w=8.98
+31.11%
|
285/85-15
d=34.07
w=9.54
+35.57%
|
| 295 |
295/25-15
d=20.81
w=2.90
-17.21%
|
295/30-15
d=21.97
w=3.48
-12.59%
|
295/35-15
d=23.13
w=4.06
-7.97%
|
295/40-15
d=24.29
w=4.65
-3.35%
|
295/45-15
d=25.45
w=5.23
+1.27%
|
295/50-15
d=26.61
w=5.81
+5.89%
|
295/55-15
d=27.78
w=6.39
+10.51%
|
295/60-15
d=28.94
w=6.97
+15.13%
|
295/65-15
d=30.10
w=7.55
+19.75%
|
295/70-15
d=31.26
w=8.13
+24.37%
|
295/75-15
d=32.42
w=8.71
+28.99%
|
295/80-15
d=33.58
w=9.29
+33.62%
|
295/85-15
d=34.74
w=9.87
+38.24%
|
| 305 |
305/25-15
d=21.00
w=3.00
-16.43%
|
305/30-15
d=22.20
w=3.60
-11.65%
|
305/35-15
d=23.41
w=4.20
-6.88%
|
305/40-15
d=24.61
w=4.80
-2.10%
|
305/45-15
d=25.81
w=5.40
+2.68%
|
305/50-15
d=27.01
w=6.00
+7.46%
|
305/55-15
d=28.21
w=6.60
+12.23%
|
305/60-15
d=29.41
w=7.20
+17.01%
|
305/65-15
d=30.61
w=7.81
+21.79%
|
305/70-15
d=31.81
w=8.41
+26.57%
|
305/75-15
d=33.01
w=9.01
+31.34%
|
305/80-15
d=34.21
w=9.61
+36.12%
|
305/85-15
d=35.41
w=10.21
+40.90%
|
| 315 |
315/25-15
d=21.20
w=3.10
-15.65%
|
315/30-15
d=22.44
w=3.72
-10.71%
|
315/35-15
d=23.68
w=4.34
-5.78%
|
315/40-15
d=24.92
w=4.96
-0.85%
|
315/45-15
d=26.16
w=5.58
+4.09%
|
315/50-15
d=27.40
w=6.20
+9.02%
|
315/55-15
d=28.64
w=6.82
+13.96%
|
315/60-15
d=29.88
w=7.44
+18.89%
|
315/65-15
d=31.12
w=8.06
+23.83%
|
315/70-15
d=32.36
w=8.68
+28.76%
|
315/75-15
d=33.60
w=9.30
+33.69%
|
315/80-15
d=34.84
w=9.92
+38.63%
|
315/85-15
d=36.08
w=10.54
+43.56%
|
| 325 |
325/25-15
d=21.40
w=3.20
-14.87%
|
325/30-15
d=22.68
w=3.84
-9.77%
|
325/35-15
d=23.96
w=4.48
-4.68%
|
325/40-15
d=25.24
w=5.12
+0.41%
|
325/45-15
d=26.52
w=5.76
+5.50%
|
325/50-15
d=27.80
w=6.40
+10.59%
|
325/55-15
d=29.07
w=7.04
+15.68%
|
325/60-15
d=30.35
w=7.68
+20.77%
|
325/65-15
d=31.63
w=8.32
+25.86%
|
325/70-15
d=32.91
w=8.96
+30.95%
|
325/75-15
d=34.19
w=9.60
+36.04%
|
325/80-15
d=35.47
w=10.24
+41.13%
|
325/85-15
d=36.75
w=10.88
+46.22%
|
| 335 |
335/25-15
d=21.59
w=3.30
-14.08%
|
335/30-15
d=22.91
w=3.96
-8.83%
|
335/35-15
d=24.23
w=4.62
-3.59%
|
335/40-15
d=25.55
w=5.28
+1.66%
|
335/45-15
d=26.87
w=5.94
+6.91%
|
335/50-15
d=28.19
w=6.59
+12.16%
|
335/55-15
d=29.51
w=7.25
+17.40%
|
335/60-15
d=30.83
w=7.91
+22.65%
|
335/65-15
d=32.15
w=8.57
+27.90%
|
335/70-15
d=33.46
w=9.23
+33.15%
|
335/75-15
d=34.78
w=9.89
+38.39%
|
335/80-15
d=36.10
w=10.55
+43.64%
|
335/85-15
d=37.42
w=11.21
+48.89%
|
|
Wheel Size 16
|
|||||||||||||
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!