Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/40r10 vs 175/65r14 Tire Comparison Side By Side
  225/40-10 175/65-14 Difference
Diameter inches (mm) 17.09 (434) 22.96 (583.1) 5.87 (149.1) 34.4%
Width inches (mm) 8.86 (225) 6.89 (175) -1.97 (-50) -22.2%
Circum. inches (mm) 53.68 (1363.45) 72.12 (1831.86) 18.44 (468.41) 34.4%
Sidewall Height inches (mm) 3.54 (90) 4.48 (113.75) 0.94 (23.75) 26.4%
Revolutions per mile (km) 1180.35 (733.43) 878.53 (545.89) -301.82 (-187.54) -25.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)26.87 mph (43.24 km/h)
25 mph (40.23 km/h)33.59 mph (54.06 km/h)
30 mph (48.28 km/h)40.31 mph (64.87 km/h)
35 mph (56.33 km/h)47.02 mph (75.68 km/h)
40 mph (64.37 km/h)53.74 mph (86.49 km/h)
45 mph (72.42 km/h)60.46 mph (97.3 km/h)
50 mph (80.47 km/h)67.18 mph (108.11 km/h)
55 mph (88.51 km/h)73.9 mph (118.92 km/h)
60 mph (96.56 km/h)80.61 mph (129.73 km/h)
65 mph (104.61 km/h)87.33 mph (140.55 km/h)
70 mph (112.65 km/h)94.05 mph (151.36 km/h)
75 mph (120.7 km/h)100.77 mph (162.17 km/h)
80 mph (128.75 km/h)107.48 mph (172.98 km/h)
85 mph (136.79 km/h)114.2 mph (183.79 km/h)
90 mph (144.84 km/h)120.92 mph (194.6 km/h)
95 mph (152.89 km/h)127.64 mph (205.41 km/h)
100 mph (160.93 km/h)134.35 mph (216.22 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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