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This tire size calculator lets you check what you can replace your tires or wheels with without changing overall tire diameter or with some acceptable diameter change. The data presented here is in no way "official", please use common sense and check with manufacturer recommendations and other references.

Current Tire Size: (examples: 185/65-14, 205/75-15) How to link to this page?
Width: to Ratio: to Wheel (Rim Size): to
Max. Difference, %:
Best Matches for 165/80-15 in 15", 16", 16.5", 17", 18".
Code Width Ratio Wheel Diameter Wall," Wall,mm Diam.Diff. = 50mph 1000miles =
205/55-16.5 205 55 16.5 25.38 4.44 112.75 -0.06% 49.97 1,000.62
225/50-16.5 225 50 16.5 25.36 4.43 112.50 -0.14% 49.93 1,001.40
195/55-17 195 55 17 25.44 4.22 107.25 +0.20% 50.10 997.98
165/65-17 165 65 17 25.44 4.22 107.25 +0.20% 50.10 997.98
175/75-15 175 75 15 25.33 5.17 131.25 -0.23% 49.88 1,002.33
175/65-16.5 175 65 16.5 25.46 4.48 113.75 +0.25% 50.12 997.52
215/50-17 215 50 17 25.46 4.23 107.50 +0.28% 50.14 997.21
185/65-16 185 65 16 25.47 4.73 120.25 +0.29% 50.15 997.05
215/55-16 215 55 16 25.31 4.66 118.25 -0.33% 49.84 1,003.26
205/65-15 205 65 15 25.49 5.25 133.25 +0.39% 50.19 996.12
185/50-18 185 50 18 25.28 3.64 92.50 -0.43% 49.78 1,004.34
175/60-17 175 60 17 25.27 4.13 105.00 -0.50% 49.75 1,004.96
205/45-18 205 45 18 25.26 3.63 92.25 -0.51% 49.74 1,005.12
185/60-16.5 185 60 16.5 25.24 4.37 111.00 -0.60% 49.70 1,006.05
195/60-16 195 60 16 25.21 4.61 117.00 -0.71% 49.64 1,007.13
175/55-18 175 55 18 25.58 3.79 96.25 +0.73% 50.36 992.71
185/70-15 185 70 15 25.20 5.10 129.50 -0.78% 49.61 1,007.75
165/70-16.5 165 70 16.5 25.59 4.55 115.50 +0.79% 50.40 992.09
215/45-18 215 45 18 25.62 3.81 96.75 +0.88% 50.44 991.16
225/60-15 225 60 15 25.63 5.31 135.00 +0.93% 50.47 990.70
215/60-15 215 60 15 25.16 5.08 129.00 -0.93% 49.53 1,009.30
165/55-18 165 55 18 25.15 3.57 90.75 -0.98% 49.51 1,009.77
175/70-16 175 70 16 25.65 4.82 122.50 +0.99% 50.50 990.08
195/50-18 195 50 18 25.68 3.84 97.50 +1.12% 50.56 988.84
205/60-16 205 60 16 25.69 4.84 123.00 +1.15% 50.57 988.53
165/70-16 165 70 16 25.09 4.55 115.50 -1.18% 49.41 1,011.78
225/40-18 225 40 18 25.09 3.54 90.00 -1.21% 49.40 1,012.09
195/60-16.5 195 60 16.5 25.71 4.61 117.00 +1.26% 50.63 987.44
205/50-17 205 50 17 25.07 4.04 102.50 -1.27% 49.36 1,012.71
185/60-17 185 60 17 25.74 4.37 111.00 +1.36% 50.68 986.36
225/55-16 225 55 16 25.74 4.87 123.75 +1.38% 50.69 986.20
165/75-16 165 75 16 25.74 4.87 123.75 +1.38% 50.69 986.20
195/70-15 195 70 15 25.75 5.37 136.50 +1.40% 50.70 986.05
185/55-17 185 55 17 25.01 4.01 101.75 -1.50% 49.25 1,015.04
165/60-18 165 60 18 25.80 3.90 99.00 +1.58% 50.79 984.19
195/65-15 195 65 15 24.98 4.99 126.75 -1.63% 49.19 1,016.28
215/55-16.5 215 55 16.5 25.81 4.66 118.25 +1.64% 50.82 983.57
225/45-17 225 45 17 24.97 3.99 101.25 -1.66% 49.17 1,016.59
215/50-16.5 215 50 16.5 24.96 4.23 107.50 -1.69% 49.16 1,016.90
175/65-16 175 65 16 24.96 4.48 113.75 -1.72% 49.14 1,017.21
195/55-16.5 195 55 16.5 24.94 4.22 107.25 -1.77% 49.12 1,017.67
165/65-16.5 165 65 16.5 24.94 4.22 107.25 -1.77% 49.12 1,017.67
225/50-17 225 50 17 25.86 4.43 112.50 +1.83% 50.91 981.71
205/55-17 205 55 17 25.88 4.44 112.75 +1.91% 50.95 980.93
195/45-18 195 45 18 24.91 3.45 87.75 -1.91% 49.05 1,019.07
175/50-18 175 50 18 24.89 3.44 87.50 -1.98% 49.01 1,019.84
"= 50mph" - true speed when speedometer shows 50mph
"1000miles =" - odometer reading for actual 1000 miles

Click on [Show] to open charts and add wheel sizes to the matches table.
Ratio: 30 35 40 45 50 55 60 65 70 75 80 85
Wheel Size 15"  
165 165/30-15
d=18.90
w=1.95
-25.58%
165/35-15
d=19.55
w=2.27
-23.02%
165/40-15
d=20.20
w=2.60
-20.47%
165/45-15
d=20.85
w=2.92
-17.91%
165/50-15
d=21.50
w=3.25
-15.35%
165/55-15
d=22.15
w=3.57
-12.79%
165/60-15
d=22.80
w=3.90
-10.23%
165/65-15
d=23.44
w=4.22
-7.67%
165/70-15
d=24.09
w=4.55
-5.12%
165/75-15
d=24.74
w=4.87
-2.56%
175 175/30-15
d=19.13
w=2.07
-24.65%
175/35-15
d=19.82
w=2.41
-21.94%
175/40-15
d=20.51
w=2.76
-19.22%
175/45-15
d=21.20
w=3.10
-16.51%
175/50-15
d=21.89
w=3.44
-13.80%
175/55-15
d=22.58
w=3.79
-11.09%
175/60-15
d=23.27
w=4.13
-8.37%
175/65-15
d=23.96
w=4.48
-5.66%
175/70-15
d=24.65
w=4.82
-2.95%
175/75-15
d=25.33
w=5.17
-0.23%
185 185/30-15
d=19.37
w=2.19
-23.72%
185/35-15
d=20.10
w=2.55
-20.85%
185/40-15
d=20.83
w=2.91
-17.98%
185/45-15
d=21.56
w=3.28
-15.12%
185/50-15
d=22.28
w=3.64
-12.25%
185/55-15
d=23.01
w=4.01
-9.38%
185/60-15
d=23.74
w=4.37
-6.51%
185/65-15
d=24.47
w=4.73
-3.64%
185/70-15
d=25.20
w=5.10
-0.78%
185/75-15
d=25.93
w=5.46
+2.09%
195 195/30-15
d=19.61
w=2.30
-22.79%
195/35-15
d=20.37
w=2.69
-19.77%
195/40-15
d=21.14
w=3.07
-16.74%
195/45-15
d=21.91
w=3.45
-13.72%
195/50-15
d=22.68
w=3.84
-10.70%
195/55-15
d=23.44
w=4.22
-7.67%
195/60-15
d=24.21
w=4.61
-4.65%
195/65-15
d=24.98
w=4.99
-1.63%
195/70-15
d=25.75
w=5.37
+1.40%
195/75-15
d=26.52
w=5.76
+4.42%
205 205/30-15
d=19.84
w=2.42
-21.86%
205/35-15
d=20.65
w=2.82
-18.68%
205/40-15
d=21.46
w=3.23
-15.50%
205/45-15
d=22.26
w=3.63
-12.33%
205/50-15
d=23.07
w=4.04
-9.15%
205/55-15
d=23.88
w=4.44
-5.97%
205/60-15
d=24.69
w=4.84
-2.79%
205/65-15
d=25.49
w=5.25
+0.39%
205/70-15
d=26.30
w=5.65
+3.57%
205/75-15
d=27.11
w=6.05
+6.74%
215 215/30-15
d=20.08
w=2.54
-20.93%
215/35-15
d=20.93
w=2.96
-17.60%
215/40-15
d=21.77
w=3.39
-14.26%
215/45-15
d=22.62
w=3.81
-10.93%
215/50-15
d=23.46
w=4.23
-7.60%
215/55-15
d=24.31
w=4.66
-4.26%
215/60-15
d=25.16
w=5.08
-0.93%
215/65-15
d=26.00
w=5.50
+2.40%
215/70-15
d=26.85
w=5.93
+5.74%
215/75-15
d=27.70
w=6.35
+9.07%
225 225/30-15
d=20.31
w=2.66
-20.00%
225/35-15
d=21.20
w=3.10
-16.51%
225/40-15
d=22.09
w=3.54
-13.02%
225/45-15
d=22.97
w=3.99
-9.53%
225/50-15
d=23.86
w=4.43
-6.05%
225/55-15
d=24.74
w=4.87
-2.56%
225/60-15
d=25.63
w=5.31
+0.93%
225/65-15
d=26.52
w=5.76
+4.42%
225/70-15
d=27.40
w=6.20
+7.91%
225/75-15
d=28.29
w=6.64
+11.40%
Wheel Size 16" [Show] [Hide]
165 165/30-16
d=19.90
w=1.95
-21.64%
165/35-16
d=20.55
w=2.27
-19.09%
165/40-16
d=21.20
w=2.60
-16.53%
165/45-16
d=21.85
w=2.92
-13.97%
165/50-16
d=22.50
w=3.25
-11.41%
165/55-16
d=23.15
w=3.57
-8.85%
165/60-16
d=23.80
w=3.90
-6.29%
165/65-16
d=24.44
w=4.22
-3.74%
165/70-16
d=25.09
w=4.55
-1.18%
165/75-16
d=25.74
w=4.87
+1.38%
175 175/30-16
d=20.13
w=2.07
-20.71%
175/35-16
d=20.82
w=2.41
-18.00%
175/40-16
d=21.51
w=2.76
-15.29%
175/45-16
d=22.20
w=3.10
-12.57%
175/50-16
d=22.89
w=3.44
-9.86%
175/55-16
d=23.58
w=3.79
-7.15%
175/60-16
d=24.27
w=4.13
-4.43%
175/65-16
d=24.96
w=4.48
-1.72%
175/70-16
d=25.65
w=4.82
+0.99%
175/75-16
d=26.33
w=5.17
+3.71%
185 185/30-16
d=20.37
w=2.19
-19.78%
185/35-16
d=21.10
w=2.55
-16.91%
185/40-16
d=21.83
w=2.91
-14.05%
185/45-16
d=22.56
w=3.28
-11.18%
185/50-16
d=23.28
w=3.64
-8.31%
185/55-16
d=24.01
w=4.01
-5.44%
185/60-16
d=24.74
w=4.37
-2.57%
185/65-16
d=25.47
w=4.73
+0.29%
185/70-16
d=26.20
w=5.10
+3.16%
185/75-16
d=26.93
w=5.46
+6.03%
195 195/30-16
d=20.61
w=2.30
-18.85%
195/35-16
d=21.37
w=2.69
-15.83%
195/40-16
d=22.14
w=3.07
-12.81%
195/45-16
d=22.91
w=3.45
-9.78%
195/50-16
d=23.68
w=3.84
-6.76%
195/55-16
d=24.44
w=4.22
-3.74%
195/60-16
d=25.21
w=4.61
-0.71%
195/65-16
d=25.98
w=4.99
+2.31%
195/70-16
d=26.75
w=5.37
+5.33%
195/75-16
d=27.52
w=5.76
+8.36%
205 205/30-16
d=20.84
w=2.42
-17.92%
205/35-16
d=21.65
w=2.82
-14.74%
205/40-16
d=22.46
w=3.23
-11.57%
205/45-16
d=23.26
w=3.63
-8.39%
205/50-16
d=24.07
w=4.04
-5.21%
205/55-16
d=24.88
w=4.44
-2.03%
205/60-16
d=25.69
w=4.84
+1.15%
205/65-16
d=26.49
w=5.25
+4.33%
205/70-16
d=27.30
w=5.65
+7.50%
205/75-16
d=28.11
w=6.05
+10.68%
215 215/30-16
d=21.08
w=2.54
-16.99%
215/35-16
d=21.93
w=2.96
-13.66%
215/40-16
d=22.77
w=3.39
-10.33%
215/45-16
d=23.62
w=3.81
-6.99%
215/50-16
d=24.46
w=4.23
-3.66%
215/55-16
d=25.31
w=4.66
-0.33%
215/60-16
d=26.16
w=5.08
+3.01%
215/65-16
d=27.00
w=5.50
+6.34%
215/70-16
d=27.85
w=5.93
+9.67%
215/75-16
d=28.70
w=6.35
+13.01%
225 225/30-16
d=21.31
w=2.66
-16.06%
225/35-16
d=22.20
w=3.10
-12.57%
225/40-16
d=23.09
w=3.54
-9.09%
225/45-16
d=23.97
w=3.99
-5.60%
225/50-16
d=24.86
w=4.43
-2.11%
225/55-16
d=25.74
w=4.87
+1.38%
225/60-16
d=26.63
w=5.31
+4.87%
225/65-16
d=27.52
w=5.76
+8.36%
225/70-16
d=28.40
w=6.20
+11.84%
225/75-16
d=29.29
w=6.64
+15.33%
Wheel Size 16.5" [Show] [Hide]
Wheel Size 17" [Show] [Hide]
165 165/30-17
d=20.90
w=1.95
-17.71%
165/35-17
d=21.55
w=2.27
-15.15%
165/40-17
d=22.20
w=2.60
-12.59%
165/45-17
d=22.85
w=2.92
-10.03%
165/50-17
d=23.50
w=3.25
-7.47%
165/55-17
d=24.15
w=3.57
-4.91%
165/60-17
d=24.80
w=3.90
-2.36%
165/65-17
d=25.44
w=4.22
+0.20%
165/70-17
d=26.09
w=4.55
+2.76%
165/75-17
d=26.74
w=4.87
+5.32%
175 175/30-17
d=21.13
w=2.07
-16.78%
175/35-17
d=21.82
w=2.41
-14.06%
175/40-17
d=22.51
w=2.76
-11.35%
175/45-17
d=23.20
w=3.10
-8.64%
175/50-17
d=23.89
w=3.44
-5.92%
175/55-17
d=24.58
w=3.79
-3.21%
175/60-17
d=25.27
w=4.13
-0.50%
175/65-17
d=25.96
w=4.48
+2.22%
175/70-17
d=26.65
w=4.82
+4.93%
175/75-17
d=27.33
w=5.17
+7.64%
185 185/30-17
d=21.37
w=2.19
-15.84%
185/35-17
d=22.10
w=2.55
-12.98%
185/40-17
d=22.83
w=2.91
-10.11%
185/45-17
d=23.56
w=3.28
-7.24%
185/50-17
d=24.28
w=3.64
-4.37%
185/55-17
d=25.01
w=4.01
-1.50%
185/60-17
d=25.74
w=4.37
+1.36%
185/65-17
d=26.47
w=4.73
+4.23%
185/70-17
d=27.20
w=5.10
+7.10%
185/75-17
d=27.93
w=5.46
+9.97%
195 195/30-17
d=21.61
w=2.30
-14.91%
195/35-17
d=22.37
w=2.69
-11.89%
195/40-17
d=23.14
w=3.07
-8.87%
195/45-17
d=23.91
w=3.45
-5.84%
195/50-17
d=24.68
w=3.84
-2.82%
195/55-17
d=25.44
w=4.22
+0.20%
195/60-17
d=26.21
w=4.61
+3.22%
195/65-17
d=26.98
w=4.99
+6.25%
195/70-17
d=27.75
w=5.37
+9.27%
195/75-17
d=28.52
w=5.76
+12.29%
205 205/30-17
d=21.84
w=2.42
-13.98%
205/35-17
d=22.65
w=2.82
-10.81%
205/40-17
d=23.46
w=3.23
-7.63%
205/45-17
d=24.26
w=3.63
-4.45%
205/50-17
d=25.07
w=4.04
-1.27%
205/55-17
d=25.88
w=4.44
+1.91%
205/60-17
d=26.69
w=4.84
+5.09%
205/65-17
d=27.49
w=5.25
+8.26%
205/70-17
d=28.30
w=5.65
+11.44%
205/75-17
d=29.11
w=6.05
+14.62%
215 215/30-17
d=22.08
w=2.54
-13.05%
215/35-17
d=22.93
w=2.96
-9.72%
215/40-17
d=23.77
w=3.39
-6.39%
215/45-17
d=24.62
w=3.81
-3.05%
215/50-17
d=25.46
w=4.23
+0.28%
215/55-17
d=26.31
w=4.66
+3.61%
215/60-17
d=27.16
w=5.08
+6.95%
215/65-17
d=28.00
w=5.50
+10.28%
215/70-17
d=28.85
w=5.93
+13.61%
215/75-17
d=29.70
w=6.35
+16.95%
225 225/30-17
d=22.31
w=2.66
-12.12%
225/35-17
d=23.20
w=3.10
-8.64%
225/40-17
d=24.09
w=3.54
-5.15%
225/45-17
d=24.97
w=3.99
-1.66%
225/50-17
d=25.86
w=4.43
+1.83%
225/55-17
d=26.74
w=4.87
+5.32%
225/60-17
d=27.63
w=5.31
+8.81%
225/65-17
d=28.52
w=5.76
+12.29%
225/70-17
d=29.40
w=6.20
+15.78%
225/75-17
d=30.29
w=6.64
+19.27%
Wheel Size 18" [Show] [Hide]

Thanx:
   Mark Sink's tire calculator -- for the idea and reference numbers
   Tirerack.com -- for quick and reliable service
   Mike.S -- for inspiration :)
   XAO::Web -- for bells and whistles that allowed to create this page in about an hour

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