Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
90/70r10 vs 145/50r10 Tire Comparison Side By Side
  90/70-10 145/50-10 Difference
Diameter inches (mm) 14.96 (380) 15.71 (399) 0.75 (19) 5%
Width inches (mm) 3.54 (90) 5.71 (145) 2.17 (55) 61.1%
Circum. inches (mm) 47 (1193.81) 49.35 (1253.5) 2.35 (59.69) 5%
Sidewall Height inches (mm) 2.48 (63) 2.85 (72.5) 0.37 (9.5) 15.1%
Revolutions per mile (km) 1348.08 (837.66) 1283.88 (797.77) -64.19 (-39.89) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21 mph (33.8 km/h)
25 mph (40.23 km/h)26.25 mph (42.25 km/h)
30 mph (48.28 km/h)31.5 mph (50.69 km/h)
35 mph (56.33 km/h)36.75 mph (59.14 km/h)
40 mph (64.37 km/h)42 mph (67.59 km/h)
45 mph (72.42 km/h)47.25 mph (76.04 km/h)
50 mph (80.47 km/h)52.5 mph (84.49 km/h)
55 mph (88.51 km/h)57.75 mph (92.94 km/h)
60 mph (96.56 km/h)63 mph (101.39 km/h)
65 mph (104.61 km/h)68.25 mph (109.84 km/h)
70 mph (112.65 km/h)73.5 mph (118.29 km/h)
75 mph (120.7 km/h)78.75 mph (126.74 km/h)
80 mph (128.75 km/h)84 mph (135.19 km/h)
85 mph (136.79 km/h)89.25 mph (143.63 km/h)
90 mph (144.84 km/h)94.5 mph (152.08 km/h)
95 mph (152.89 km/h)99.75 mph (160.53 km/h)
100 mph (160.93 km/h)105 mph (168.98 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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