Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/35r17 vs 275/40r17 Tire Comparison Side By Side
  245/35-17 275/40-17 Difference
Diameter inches (mm) 23.75 (603.3) 25.66 (651.8) 1.91 (48.5) 8%
Width inches (mm) 9.65 (245) 10.83 (275) 1.18 (30) 12.2%
Circum. inches (mm) 74.62 (1895.32) 80.62 (2047.69) 6 (152.37) 8%
Sidewall Height inches (mm) 3.38 (85.75) 4.33 (110) 0.95 (24.25) 28.3%
Revolutions per mile (km) 849.11 (527.61) 785.93 (488.35) -63.18 (-39.26) -7.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.61 mph (34.77 km/h)
25 mph (40.23 km/h)27.01 mph (43.47 km/h)
30 mph (48.28 km/h)32.41 mph (52.16 km/h)
35 mph (56.33 km/h)37.81 mph (60.86 km/h)
40 mph (64.37 km/h)43.22 mph (69.55 km/h)
45 mph (72.42 km/h)48.62 mph (78.24 km/h)
50 mph (80.47 km/h)54.02 mph (86.94 km/h)
55 mph (88.51 km/h)59.42 mph (95.63 km/h)
60 mph (96.56 km/h)64.82 mph (104.32 km/h)
65 mph (104.61 km/h)70.23 mph (113.02 km/h)
70 mph (112.65 km/h)75.63 mph (121.71 km/h)
75 mph (120.7 km/h)81.03 mph (130.4 km/h)
80 mph (128.75 km/h)86.43 mph (139.1 km/h)
85 mph (136.79 km/h)91.83 mph (147.79 km/h)
90 mph (144.84 km/h)97.24 mph (156.49 km/h)
95 mph (152.89 km/h)102.64 mph (165.18 km/h)
100 mph (160.93 km/h)108.04 mph (173.87 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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