Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/75r16 vs 235/75r15 Tire Comparison Side By Side
  225/75-16 235/75-15 Difference
Diameter inches (mm) 29.29 (743.9) 28.88 (733.5) -0.41 (-10.4) -1.4%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 92.01 (2337.03) 90.72 (2304.36) -1.29 (-32.67) -1.4%
Sidewall Height inches (mm) 6.64 (168.75) 6.94 (176.25) 0.3 (7.5) 4.4%
Revolutions per mile (km) 688.63 (427.89) 698.39 (433.96) 9.76 (6.07) 1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.72 mph (31.74 km/h)
25 mph (40.23 km/h)24.65 mph (39.67 km/h)
30 mph (48.28 km/h)29.58 mph (47.61 km/h)
35 mph (56.33 km/h)34.51 mph (55.54 km/h)
40 mph (64.37 km/h)39.44 mph (63.47 km/h)
45 mph (72.42 km/h)44.37 mph (71.41 km/h)
50 mph (80.47 km/h)49.3 mph (79.34 km/h)
55 mph (88.51 km/h)54.23 mph (87.28 km/h)
60 mph (96.56 km/h)59.16 mph (95.21 km/h)
65 mph (104.61 km/h)64.09 mph (103.15 km/h)
70 mph (112.65 km/h)69.02 mph (111.08 km/h)
75 mph (120.7 km/h)73.95 mph (119.01 km/h)
80 mph (128.75 km/h)78.88 mph (126.95 km/h)
85 mph (136.79 km/h)83.81 mph (134.88 km/h)
90 mph (144.84 km/h)88.74 mph (142.82 km/h)
95 mph (152.89 km/h)93.67 mph (150.75 km/h)
100 mph (160.93 km/h)98.6 mph (158.68 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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