Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
110/80r19 vs 90/90r21 Tire Comparison Side By Side
  110/80-19 90/90-21 Difference
Diameter inches (mm) 25.93 (658.6) 27.38 (695.4) 1.45 (36.8) 5.6%
Width inches (mm) 4.33 (110) 3.54 (90) -0.79 (-20) -18.2%
Circum. inches (mm) 81.46 (2069.05) 86.01 (2184.66) 4.55 (115.61) 5.6%
Sidewall Height inches (mm) 3.46 (88) 3.19 (81) -0.28 (-7) -8%
Revolutions per mile (km) 777.82 (483.31) 736.66 (457.74) -41.16 (-25.58) -5.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.12 mph (33.99 km/h)
25 mph (40.23 km/h)26.4 mph (42.48 km/h)
30 mph (48.28 km/h)31.68 mph (50.98 km/h)
35 mph (56.33 km/h)36.96 mph (59.47 km/h)
40 mph (64.37 km/h)42.24 mph (67.97 km/h)
45 mph (72.42 km/h)47.51 mph (76.47 km/h)
50 mph (80.47 km/h)52.79 mph (84.96 km/h)
55 mph (88.51 km/h)58.07 mph (93.46 km/h)
60 mph (96.56 km/h)63.35 mph (101.96 km/h)
65 mph (104.61 km/h)68.63 mph (110.45 km/h)
70 mph (112.65 km/h)73.91 mph (118.95 km/h)
75 mph (120.7 km/h)79.19 mph (127.45 km/h)
80 mph (128.75 km/h)84.47 mph (135.94 km/h)
85 mph (136.79 km/h)89.75 mph (144.44 km/h)
90 mph (144.84 km/h)95.03 mph (152.93 km/h)
95 mph (152.89 km/h)100.31 mph (161.43 km/h)
100 mph (160.93 km/h)105.59 mph (169.93 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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