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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 185/60-15 in 15".
Code Width Ratio Wheel Diameter Wall," Wall,mm Diam.Diff. = 50mph 1000miles =
185/60-15 185 60 15 23.74 4.37 111.00 0.00% 50.00 1,000.00
205/55-15 205 55 15 23.88 4.44 112.75 +0.58% 50.29 994.20
195/55-15 195 55 15 23.44 4.22 107.25 -1.24% 49.38 1,012.44
195/60-15 195 60 15 24.21 4.61 117.00 +1.99% 51.00 980.10
"= 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 12" [Show] [Hide]
Wheel Size 13" [Show] [Hide]
Wheel Size 14" [Show] [Hide]
Wheel Size 15"  
185 185/30-15
d=19.37
w=2.19
-18.41%
185/35-15
d=20.10
w=2.55
-15.34%
185/40-15
d=20.83
w=2.91
-12.27%
185/45-15
d=21.56
w=3.28
-9.20%
185/50-15
d=22.28
w=3.64
-6.14%
185/55-15
d=23.01
w=4.01
-3.07%
185/60-15
d=23.74
w=4.37
0.00%
185/65-15
d=24.47
w=4.73
+3.07%
185/70-15
d=25.20
w=5.10
+6.14%
185/75-15
d=25.93
w=5.46
+9.20%
195 195/30-15
d=19.61
w=2.30
-17.41%
195/35-15
d=20.37
w=2.69
-14.18%
195/40-15
d=21.14
w=3.07
-10.95%
195/45-15
d=21.91
w=3.45
-7.71%
195/50-15
d=22.68
w=3.84
-4.48%
195/55-15
d=23.44
w=4.22
-1.24%
195/60-15
d=24.21
w=4.61
+1.99%
195/65-15
d=24.98
w=4.99
+5.22%
195/70-15
d=25.75
w=5.37
+8.46%
195/75-15
d=26.52
w=5.76
+11.69%
205 205/30-15
d=19.84
w=2.42
-16.42%
205/35-15
d=20.65
w=2.82
-13.02%
205/40-15
d=21.46
w=3.23
-9.62%
205/45-15
d=22.26
w=3.63
-6.22%
205/50-15
d=23.07
w=4.04
-2.82%
205/55-15
d=23.88
w=4.44
+0.58%
205/60-15
d=24.69
w=4.84
+3.98%
205/65-15
d=25.49
w=5.25
+7.38%
205/70-15
d=26.30
w=5.65
+10.78%
205/75-15
d=27.11
w=6.05
+14.18%
Wheel Size 16" [Show] [Hide]
Wheel Size 16.5" [Show] [Hide]
Wheel Size 17" [Show] [Hide]
Wheel Size 18" [Show] [Hide]
Wheel Size 19" [Show] [Hide]
Wheel Size 20" [Show] [Hide]
Wheel Size 21" [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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