Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/80r20 vs 275/95r18 Tire Comparison Side By Side
  275/80-20 275/95-18 Difference
Diameter inches (mm) 37.32 (948) 38.57 (979.7) 1.25 (31.7) 3.3%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 117.25 (2978.23) 121.17 (3077.82) 3.92 (99.59) 3.3%
Sidewall Height inches (mm) 8.66 (220) 10.29 (261.25) 1.62 (41.25) 18.8%
Revolutions per mile (km) 540.37 (335.77) 522.88 (324.9) -17.48 (-10.86) -3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.67 mph (33.26 km/h)
25 mph (40.23 km/h)25.84 mph (41.58 km/h)
30 mph (48.28 km/h)31 mph (49.89 km/h)
35 mph (56.33 km/h)36.17 mph (58.21 km/h)
40 mph (64.37 km/h)41.34 mph (66.53 km/h)
45 mph (72.42 km/h)46.5 mph (74.84 km/h)
50 mph (80.47 km/h)51.67 mph (83.16 km/h)
55 mph (88.51 km/h)56.84 mph (91.47 km/h)
60 mph (96.56 km/h)62.01 mph (99.79 km/h)
65 mph (104.61 km/h)67.17 mph (108.11 km/h)
70 mph (112.65 km/h)72.34 mph (116.42 km/h)
75 mph (120.7 km/h)77.51 mph (124.74 km/h)
80 mph (128.75 km/h)82.68 mph (133.05 km/h)
85 mph (136.79 km/h)87.84 mph (141.37 km/h)
90 mph (144.84 km/h)93.01 mph (149.68 km/h)
95 mph (152.89 km/h)98.18 mph (158 km/h)
100 mph (160.93 km/h)103.34 mph (166.32 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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