Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r15 vs 235/75r15 Tire Comparison Side By Side
  235/50-15 235/75-15 Difference
Diameter inches (mm) 24.25 (616) 28.88 (733.5) 4.63 (117.5) 19.1%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 76.19 (1935.22) 90.72 (2304.36) 14.53 (369.14) 19.1%
Sidewall Height inches (mm) 4.63 (117.5) 6.94 (176.25) 2.31 (58.75) 50%
Revolutions per mile (km) 831.61 (516.74) 698.39 (433.96) -133.22 (-82.78) -16%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.81 mph (38.33 km/h)
25 mph (40.23 km/h)29.77 mph (47.91 km/h)
30 mph (48.28 km/h)35.72 mph (57.49 km/h)
35 mph (56.33 km/h)41.68 mph (67.07 km/h)
40 mph (64.37 km/h)47.63 mph (76.65 km/h)
45 mph (72.42 km/h)53.58 mph (86.23 km/h)
50 mph (80.47 km/h)59.54 mph (95.82 km/h)
55 mph (88.51 km/h)65.49 mph (105.4 km/h)
60 mph (96.56 km/h)71.44 mph (114.98 km/h)
65 mph (104.61 km/h)77.4 mph (124.56 km/h)
70 mph (112.65 km/h)83.35 mph (134.14 km/h)
75 mph (120.7 km/h)89.31 mph (143.72 km/h)
80 mph (128.75 km/h)95.26 mph (153.31 km/h)
85 mph (136.79 km/h)101.21 mph (162.89 km/h)
90 mph (144.84 km/h)107.17 mph (172.47 km/h)
95 mph (152.89 km/h)113.12 mph (182.05 km/h)
100 mph (160.93 km/h)119.07 mph (191.63 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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