Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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90/70r14 vs 110/80r14 Tire Comparison Side By Side
  90/70-14 110/80-14 Difference
Diameter inches (mm) 18.96 (481.6) 20.93 (531.6) 1.97 (50) 10.4%
Width inches (mm) 3.54 (90) 4.33 (110) 0.79 (20) 22.2%
Circum. inches (mm) 59.57 (1512.99) 65.75 (1670.07) 6.18 (157.08) 10.4%
Sidewall Height inches (mm) 2.48 (63) 3.46 (88) 0.98 (25) 39.7%
Revolutions per mile (km) 1063.68 (660.94) 963.64 (598.78) -100.05 (-62.17) -9.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.08 mph (35.53 km/h)
25 mph (40.23 km/h)27.6 mph (44.41 km/h)
30 mph (48.28 km/h)33.11 mph (53.29 km/h)
35 mph (56.33 km/h)38.63 mph (62.18 km/h)
40 mph (64.37 km/h)44.15 mph (71.06 km/h)
45 mph (72.42 km/h)49.67 mph (79.94 km/h)
50 mph (80.47 km/h)55.19 mph (88.82 km/h)
55 mph (88.51 km/h)60.71 mph (97.7 km/h)
60 mph (96.56 km/h)66.23 mph (106.59 km/h)
65 mph (104.61 km/h)71.75 mph (115.47 km/h)
70 mph (112.65 km/h)77.27 mph (124.35 km/h)
75 mph (120.7 km/h)82.79 mph (133.23 km/h)
80 mph (128.75 km/h)88.31 mph (142.11 km/h)
85 mph (136.79 km/h)93.82 mph (151 km/h)
90 mph (144.84 km/h)99.34 mph (159.88 km/h)
95 mph (152.89 km/h)104.86 mph (168.76 km/h)
100 mph (160.93 km/h)110.38 mph (177.64 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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