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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 175/70-13 in 13", 14", 15".
Code Width Ratio Wheel Diameter Wall," Wall,mm Diam.Diff. = 50mph 1000miles =
175/70-13 175 70 13 22.65 4.82 122.50 0.00% 50.00 1,000.00
175/55-15 175 55 15 22.58 3.79 96.25 -0.30% 49.85 1,002.96
185/60-14 185 60 14 22.74 4.37 111.00 +0.42% 50.21 995.83
185/65-13 185 65 13 22.47 4.73 120.25 -0.78% 49.61 1,007.82
175/65-14 175 65 14 22.96 4.48 113.75 +1.37% 50.69 986.27
185/55-15 185 55 15 23.01 4.01 101.75 +1.62% 50.81 983.83
175/60-14 175 60 14 22.27 4.13 105.00 -1.67% 49.17 1,016.69
"= 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 13"  
175 175/30-13
d=17.13
w=2.07
-24.34%
175/35-13
d=17.82
w=2.41
-21.30%
175/40-13
d=18.51
w=2.76
-18.25%
175/45-13
d=19.20
w=3.10
-15.21%
175/50-13
d=19.89
w=3.44
-12.17%
175/55-13
d=20.58
w=3.79
-9.13%
175/60-13
d=21.27
w=4.13
-6.08%
175/65-13
d=21.96
w=4.48
-3.04%
175/70-13
d=22.65
w=4.82
0.00%
175/75-13
d=23.33
w=5.17
+3.04%
185 185/30-13
d=17.37
w=2.19
-23.30%
185/35-13
d=18.10
w=2.55
-20.08%
185/40-13
d=18.83
w=2.91
-16.86%
185/45-13
d=19.56
w=3.28
-13.65%
185/50-13
d=20.28
w=3.64
-10.43%
185/55-13
d=21.01
w=4.01
-7.21%
185/60-13
d=21.74
w=4.37
-4.00%
185/65-13
d=22.47
w=4.73
-0.78%
185/70-13
d=23.20
w=5.10
+2.43%
185/75-13
d=23.93
w=5.46
+5.65%
Wheel Size 14" [Show] [Hide]
175 175/30-14
d=18.13
w=2.07
-19.92%
175/35-14
d=18.82
w=2.41
-16.88%
175/40-14
d=19.51
w=2.76
-13.84%
175/45-14
d=20.20
w=3.10
-10.80%
175/50-14
d=20.89
w=3.44
-7.75%
175/55-14
d=21.58
w=3.79
-4.71%
175/60-14
d=22.27
w=4.13
-1.67%
175/65-14
d=22.96
w=4.48
+1.37%
175/70-14
d=23.65
w=4.82
+4.42%
175/75-14
d=24.33
w=5.17
+7.46%
185 185/30-14
d=18.37
w=2.19
-18.88%
185/35-14
d=19.10
w=2.55
-15.66%
185/40-14
d=19.83
w=2.91
-12.45%
185/45-14
d=20.56
w=3.28
-9.23%
185/50-14
d=21.28
w=3.64
-6.02%
185/55-14
d=22.01
w=4.01
-2.80%
185/60-14
d=22.74
w=4.37
+0.42%
185/65-14
d=23.47
w=4.73
+3.63%
185/70-14
d=24.20
w=5.10
+6.85%
185/75-14
d=24.93
w=5.46
+10.07%
Wheel Size 15" [Show] [Hide]
175 175/30-15
d=19.13
w=2.07
-15.51%
175/35-15
d=19.82
w=2.41
-12.47%
175/40-15
d=20.51
w=2.76
-9.42%
175/45-15
d=21.20
w=3.10
-6.38%
175/50-15
d=21.89
w=3.44
-3.34%
175/55-15
d=22.58
w=3.79
-0.30%
175/60-15
d=23.27
w=4.13
+2.75%
175/65-15
d=23.96
w=4.48
+5.79%
175/70-15
d=24.65
w=4.82
+8.83%
175/75-15
d=25.33
w=5.17
+11.87%
185 185/30-15
d=19.37
w=2.19
-14.46%
185/35-15
d=20.10
w=2.55
-11.25%
185/40-15
d=20.83
w=2.91
-8.03%
185/45-15
d=21.56
w=3.28
-4.82%
185/50-15
d=22.28
w=3.64
-1.60%
185/55-15
d=23.01
w=4.01
+1.62%
185/60-15
d=23.74
w=4.37
+4.83%
185/65-15
d=24.47
w=4.73
+8.05%
185/70-15
d=25.20
w=5.10
+11.27%
185/75-15
d=25.93
w=5.46
+14.48%

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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