Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/75r15 vs 265/70r17 Tire Comparison Side By Side
  235/75-15 265/70-17 Difference
Diameter inches (mm) 28.88 (733.5) 31.61 (802.8) 2.73 (69.3) 9.4%
Width inches (mm) 9.25 (235) 10.43 (265) 1.18 (30) 12.8%
Circum. inches (mm) 90.72 (2304.36) 99.29 (2522.07) 8.57 (217.71) 9.4%
Sidewall Height inches (mm) 6.94 (176.25) 7.3 (185.5) 0.36 (9.25) 5.2%
Revolutions per mile (km) 698.39 (433.96) 638.1 (396.5) -60.29 (-37.46) -8.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.89 mph (35.23 km/h)
25 mph (40.23 km/h)27.36 mph (44.03 km/h)
30 mph (48.28 km/h)32.83 mph (52.84 km/h)
35 mph (56.33 km/h)38.31 mph (61.65 km/h)
40 mph (64.37 km/h)43.78 mph (70.46 km/h)
45 mph (72.42 km/h)49.25 mph (79.26 km/h)
50 mph (80.47 km/h)54.72 mph (88.07 km/h)
55 mph (88.51 km/h)60.2 mph (96.88 km/h)
60 mph (96.56 km/h)65.67 mph (105.68 km/h)
65 mph (104.61 km/h)71.14 mph (114.49 km/h)
70 mph (112.65 km/h)76.61 mph (123.3 km/h)
75 mph (120.7 km/h)82.09 mph (132.1 km/h)
80 mph (128.75 km/h)87.56 mph (140.91 km/h)
85 mph (136.79 km/h)93.03 mph (149.72 km/h)
90 mph (144.84 km/h)98.5 mph (158.53 km/h)
95 mph (152.89 km/h)103.98 mph (167.33 km/h)
100 mph (160.93 km/h)109.45 mph (176.14 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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