Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/60r13 vs 175/70r13 Tire Comparison Side By Side
  145/60-13 175/70-13 Difference
Diameter inches (mm) 19.85 (504.2) 22.65 (575.2) 2.8 (71) 14.1%
Width inches (mm) 5.71 (145) 6.89 (175) 1.18 (30) 20.7%
Circum. inches (mm) 62.36 (1583.99) 71.14 (1807.04) 8.78 (223.05) 14.1%
Sidewall Height inches (mm) 3.43 (87) 4.82 (122.5) 1.4 (35.5) 40.8%
Revolutions per mile (km) 1016.01 (631.32) 890.59 (553.39) -125.41 (-77.93) -12.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.82 mph (36.72 km/h)
25 mph (40.23 km/h)28.52 mph (45.9 km/h)
30 mph (48.28 km/h)34.22 mph (55.08 km/h)
35 mph (56.33 km/h)39.93 mph (64.26 km/h)
40 mph (64.37 km/h)45.63 mph (73.44 km/h)
45 mph (72.42 km/h)51.34 mph (82.62 km/h)
50 mph (80.47 km/h)57.04 mph (91.8 km/h)
55 mph (88.51 km/h)62.74 mph (100.98 km/h)
60 mph (96.56 km/h)68.45 mph (110.16 km/h)
65 mph (104.61 km/h)74.15 mph (119.34 km/h)
70 mph (112.65 km/h)79.86 mph (128.52 km/h)
75 mph (120.7 km/h)85.56 mph (137.7 km/h)
80 mph (128.75 km/h)91.27 mph (146.88 km/h)
85 mph (136.79 km/h)96.97 mph (156.06 km/h)
90 mph (144.84 km/h)102.67 mph (165.24 km/h)
95 mph (152.89 km/h)108.38 mph (174.42 km/h)
100 mph (160.93 km/h)114.08 mph (183.6 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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