Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/70r13 vs 145/80r13 Tire Comparison Side By Side
  135/70-13 145/80-13 Difference
Diameter inches (mm) 20.44 (519.2) 22.13 (562.2) 1.69 (43) 8.3%
Width inches (mm) 5.31 (135) 5.71 (145) 0.39 (10) 7.4%
Circum. inches (mm) 64.22 (1631.11) 69.54 (1766.2) 5.32 (135.09) 8.3%
Sidewall Height inches (mm) 3.72 (94.5) 4.57 (116) 0.85 (21.5) 22.8%
Revolutions per mile (km) 986.65 (613.08) 911.19 (566.19) -75.46 (-46.89) -7.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.66 mph (34.85 km/h)
25 mph (40.23 km/h)27.07 mph (43.57 km/h)
30 mph (48.28 km/h)32.48 mph (52.28 km/h)
35 mph (56.33 km/h)37.9 mph (60.99 km/h)
40 mph (64.37 km/h)43.31 mph (69.71 km/h)
45 mph (72.42 km/h)48.73 mph (78.42 km/h)
50 mph (80.47 km/h)54.14 mph (87.13 km/h)
55 mph (88.51 km/h)59.56 mph (95.84 km/h)
60 mph (96.56 km/h)64.97 mph (104.56 km/h)
65 mph (104.61 km/h)70.38 mph (113.27 km/h)
70 mph (112.65 km/h)75.8 mph (121.98 km/h)
75 mph (120.7 km/h)81.21 mph (130.7 km/h)
80 mph (128.75 km/h)86.63 mph (139.41 km/h)
85 mph (136.79 km/h)92.04 mph (148.12 km/h)
90 mph (144.84 km/h)97.45 mph (156.84 km/h)
95 mph (152.89 km/h)102.87 mph (165.55 km/h)
100 mph (160.93 km/h)108.28 mph (174.26 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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