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 275/95r20 Tire Comparison Side By Side
  275/80-20 275/95-20 Difference
Diameter inches (mm) 37.32 (948) 40.57 (1030.5) 3.25 (82.5) 8.7%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 117.25 (2978.23) 127.46 (3237.41) 10.2 (259.18) 8.7%
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) 497.11 (308.89) -43.26 (-26.88) -8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.74 mph (34.99 km/h)
25 mph (40.23 km/h)27.18 mph (43.74 km/h)
30 mph (48.28 km/h)32.61 mph (52.48 km/h)
35 mph (56.33 km/h)38.05 mph (61.23 km/h)
40 mph (64.37 km/h)43.48 mph (69.98 km/h)
45 mph (72.42 km/h)48.92 mph (78.72 km/h)
50 mph (80.47 km/h)54.35 mph (87.47 km/h)
55 mph (88.51 km/h)59.79 mph (96.22 km/h)
60 mph (96.56 km/h)65.22 mph (104.96 km/h)
65 mph (104.61 km/h)70.66 mph (113.71 km/h)
70 mph (112.65 km/h)76.09 mph (122.46 km/h)
75 mph (120.7 km/h)81.53 mph (131.21 km/h)
80 mph (128.75 km/h)86.96 mph (139.95 km/h)
85 mph (136.79 km/h)92.4 mph (148.7 km/h)
90 mph (144.84 km/h)97.83 mph (157.45 km/h)
95 mph (152.89 km/h)103.27 mph (166.19 km/h)
100 mph (160.93 km/h)108.7 mph (174.94 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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