Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/70r14 vs 27/8.5r14 Tire Comparison Side By Side
  215/70-14 27/8.5-14 Difference
Diameter inches (mm) 25.85 (656.6) 26.93 (683.92) 1.08 (27.32) 4.2%
Width inches (mm) 8.46 (215) 8.5 (216) 0.04 (1) 0.5%
Circum. inches (mm) 81.21 (2062.77) 84.59 (2148.6) 3.38 (85.83) 4.2%
Sidewall Height inches (mm) 5.93 (150.5) 6.46 (164.16) 0.54 (13.66) 9.1%
Revolutions per mile (km) 780.19 (484.78) 749.02 (465.42) -31.17 (-19.37) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.83 mph (33.53 km/h)
25 mph (40.23 km/h)26.04 mph (41.91 km/h)
30 mph (48.28 km/h)31.25 mph (50.29 km/h)
35 mph (56.33 km/h)36.46 mph (58.67 km/h)
40 mph (64.37 km/h)41.66 mph (67.05 km/h)
45 mph (72.42 km/h)46.87 mph (75.43 km/h)
50 mph (80.47 km/h)52.08 mph (83.82 km/h)
55 mph (88.51 km/h)57.29 mph (92.2 km/h)
60 mph (96.56 km/h)62.5 mph (100.58 km/h)
65 mph (104.61 km/h)67.7 mph (108.96 km/h)
70 mph (112.65 km/h)72.91 mph (117.34 km/h)
75 mph (120.7 km/h)78.12 mph (125.72 km/h)
80 mph (128.75 km/h)83.33 mph (134.1 km/h)
85 mph (136.79 km/h)88.54 mph (142.49 km/h)
90 mph (144.84 km/h)93.74 mph (150.87 km/h)
95 mph (152.89 km/h)98.95 mph (159.25 km/h)
100 mph (160.93 km/h)104.16 mph (167.63 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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