Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
115/70r14 vs 105/90r13 Tire Comparison Side By Side
  115/70-14 105/90-13 Difference
Diameter inches (mm) 20.34 (516.6) 20.44 (519.2) 0.1 (2.6) 0.5%
Width inches (mm) 4.53 (115) 4.13 (105) -0.39 (-10) -8.7%
Circum. inches (mm) 63.9 (1622.95) 64.22 (1631.11) 0.32 (8.17) 0.5%
Sidewall Height inches (mm) 3.17 (80.5) 3.72 (94.5) 0.55 (14) 17.4%
Revolutions per mile (km) 991.62 (616.16) 986.65 (613.08) -4.97 (-3.09) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.1 mph (32.35 km/h)
25 mph (40.23 km/h)25.13 mph (40.44 km/h)
30 mph (48.28 km/h)30.15 mph (48.52 km/h)
35 mph (56.33 km/h)35.18 mph (56.61 km/h)
40 mph (64.37 km/h)40.2 mph (64.7 km/h)
45 mph (72.42 km/h)45.23 mph (72.79 km/h)
50 mph (80.47 km/h)50.25 mph (80.87 km/h)
55 mph (88.51 km/h)55.28 mph (88.96 km/h)
60 mph (96.56 km/h)60.3 mph (97.05 km/h)
65 mph (104.61 km/h)65.33 mph (105.13 km/h)
70 mph (112.65 km/h)70.35 mph (113.22 km/h)
75 mph (120.7 km/h)75.38 mph (121.31 km/h)
80 mph (128.75 km/h)80.4 mph (129.4 km/h)
85 mph (136.79 km/h)85.43 mph (137.48 km/h)
90 mph (144.84 km/h)90.45 mph (145.57 km/h)
95 mph (152.89 km/h)95.48 mph (153.66 km/h)
100 mph (160.93 km/h)100.5 mph (161.74 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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