Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
240/55r16 vs 270/65r16 Tire Comparison Side By Side
  240/55-16 270/65-16 Difference
Diameter inches (mm) 26.39 (670.4) 29.82 (757.4) 3.43 (87) 13%
Width inches (mm) 9.45 (240) 10.63 (270) 1.18 (30) 12.5%
Circum. inches (mm) 82.92 (2106.12) 93.68 (2379.44) 10.76 (273.32) 13%
Sidewall Height inches (mm) 5.2 (132) 6.91 (175.5) 1.71 (43.5) 33%
Revolutions per mile (km) 764.13 (474.81) 676.35 (420.27) -87.77 (-54.54) -11.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.6 mph (36.36 km/h)
25 mph (40.23 km/h)28.24 mph (45.45 km/h)
30 mph (48.28 km/h)33.89 mph (54.55 km/h)
35 mph (56.33 km/h)39.54 mph (63.64 km/h)
40 mph (64.37 km/h)45.19 mph (72.73 km/h)
45 mph (72.42 km/h)50.84 mph (81.82 km/h)
50 mph (80.47 km/h)56.49 mph (90.91 km/h)
55 mph (88.51 km/h)62.14 mph (100 km/h)
60 mph (96.56 km/h)67.79 mph (109.09 km/h)
65 mph (104.61 km/h)73.44 mph (118.18 km/h)
70 mph (112.65 km/h)79.08 mph (127.27 km/h)
75 mph (120.7 km/h)84.73 mph (136.36 km/h)
80 mph (128.75 km/h)90.38 mph (145.46 km/h)
85 mph (136.79 km/h)96.03 mph (154.55 km/h)
90 mph (144.84 km/h)101.68 mph (163.64 km/h)
95 mph (152.89 km/h)107.33 mph (172.73 km/h)
100 mph (160.93 km/h)112.98 mph (181.82 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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