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 245/75r15 Tire Comparison Side By Side
  235/75-15 245/75-15 Difference
Diameter inches (mm) 28.88 (733.5) 29.47 (748.5) 0.59 (15) 2%
Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%
Circum. inches (mm) 90.72 (2304.36) 92.58 (2351.48) 1.86 (47.12) 2%
Sidewall Height inches (mm) 6.94 (176.25) 7.23 (183.75) 0.3 (7.5) 4.3%
Revolutions per mile (km) 698.39 (433.96) 684.4 (425.26) -14 (-8.7) -2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.41 mph (32.85 km/h)
25 mph (40.23 km/h)25.51 mph (41.06 km/h)
30 mph (48.28 km/h)30.61 mph (49.27 km/h)
35 mph (56.33 km/h)35.72 mph (57.48 km/h)
40 mph (64.37 km/h)40.82 mph (65.69 km/h)
45 mph (72.42 km/h)45.92 mph (73.9 km/h)
50 mph (80.47 km/h)51.02 mph (82.11 km/h)
55 mph (88.51 km/h)56.12 mph (90.32 km/h)
60 mph (96.56 km/h)61.23 mph (98.54 km/h)
65 mph (104.61 km/h)66.33 mph (106.75 km/h)
70 mph (112.65 km/h)71.43 mph (114.96 km/h)
75 mph (120.7 km/h)76.53 mph (123.17 km/h)
80 mph (128.75 km/h)81.64 mph (131.38 km/h)
85 mph (136.79 km/h)86.74 mph (139.59 km/h)
90 mph (144.84 km/h)91.84 mph (147.8 km/h)
95 mph (152.89 km/h)96.94 mph (156.01 km/h)
100 mph (160.93 km/h)102.04 mph (164.23 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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