Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/80r16 vs 235/85r16 Tire Comparison Side By Side
  215/80-16 235/85-16 Difference
Diameter inches (mm) 29.54 (750.4) 31.73 (805.9) 2.19 (55.5) 7.4%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 92.81 (2357.45) 99.68 (2531.81) 6.86 (174.36) 7.4%
Sidewall Height inches (mm) 6.77 (172) 7.86 (199.75) 1.09 (27.75) 16.1%
Revolutions per mile (km) 682.66 (424.19) 635.65 (394.97) -47.01 (-29.21) -6.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.48 mph (34.57 km/h)
25 mph (40.23 km/h)26.85 mph (43.21 km/h)
30 mph (48.28 km/h)32.22 mph (51.85 km/h)
35 mph (56.33 km/h)37.59 mph (60.49 km/h)
40 mph (64.37 km/h)42.96 mph (69.14 km/h)
45 mph (72.42 km/h)48.33 mph (77.78 km/h)
50 mph (80.47 km/h)53.7 mph (86.42 km/h)
55 mph (88.51 km/h)59.07 mph (95.06 km/h)
60 mph (96.56 km/h)64.44 mph (103.7 km/h)
65 mph (104.61 km/h)69.81 mph (112.34 km/h)
70 mph (112.65 km/h)75.18 mph (120.99 km/h)
75 mph (120.7 km/h)80.55 mph (129.63 km/h)
80 mph (128.75 km/h)85.92 mph (138.27 km/h)
85 mph (136.79 km/h)91.29 mph (146.91 km/h)
90 mph (144.84 km/h)96.66 mph (155.55 km/h)
95 mph (152.89 km/h)102.03 mph (164.2 km/h)
100 mph (160.93 km/h)107.4 mph (172.84 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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