Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/85r16 vs 235/85r16 Tire Comparison Side By Side
  215/85-16 235/85-16 Difference
Diameter inches (mm) 30.39 (771.9) 31.73 (805.9) 1.34 (34) 4.4%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 95.47 (2425) 99.68 (2531.81) 4.21 (106.81) 4.4%
Sidewall Height inches (mm) 7.19 (182.75) 7.86 (199.75) 0.67 (17) 9.3%
Revolutions per mile (km) 663.65 (412.37) 635.65 (394.97) -28 (-17.4) -4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.88 mph (33.6 km/h)
25 mph (40.23 km/h)26.1 mph (42.01 km/h)
30 mph (48.28 km/h)31.32 mph (50.41 km/h)
35 mph (56.33 km/h)36.54 mph (58.81 km/h)
40 mph (64.37 km/h)41.76 mph (67.21 km/h)
45 mph (72.42 km/h)46.98 mph (75.61 km/h)
50 mph (80.47 km/h)52.2 mph (84.01 km/h)
55 mph (88.51 km/h)57.42 mph (92.41 km/h)
60 mph (96.56 km/h)62.64 mph (100.81 km/h)
65 mph (104.61 km/h)67.86 mph (109.22 km/h)
70 mph (112.65 km/h)73.08 mph (117.62 km/h)
75 mph (120.7 km/h)78.3 mph (126.02 km/h)
80 mph (128.75 km/h)83.52 mph (134.42 km/h)
85 mph (136.79 km/h)88.74 mph (142.82 km/h)
90 mph (144.84 km/h)93.96 mph (151.22 km/h)
95 mph (152.89 km/h)99.18 mph (159.62 km/h)
100 mph (160.93 km/h)104.4 mph (168.02 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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