Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/70r16 vs 215/85r16 Tire Comparison Side By Side
  205/70-16 215/85-16 Difference
Diameter inches (mm) 27.3 (693.4) 30.39 (771.9) 3.09 (78.5) 11.3%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 85.76 (2178.38) 95.47 (2425) 9.71 (246.62) 11.3%
Sidewall Height inches (mm) 5.65 (143.5) 7.19 (182.75) 1.55 (39.25) 27.4%
Revolutions per mile (km) 738.78 (459.06) 663.65 (412.37) -75.13 (-46.68) -10.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.26 mph (35.83 km/h)
25 mph (40.23 km/h)27.83 mph (44.79 km/h)
30 mph (48.28 km/h)33.4 mph (53.75 km/h)
35 mph (56.33 km/h)38.96 mph (62.7 km/h)
40 mph (64.37 km/h)44.53 mph (71.66 km/h)
45 mph (72.42 km/h)50.09 mph (80.62 km/h)
50 mph (80.47 km/h)55.66 mph (89.58 km/h)
55 mph (88.51 km/h)61.23 mph (98.53 km/h)
60 mph (96.56 km/h)66.79 mph (107.49 km/h)
65 mph (104.61 km/h)72.36 mph (116.45 km/h)
70 mph (112.65 km/h)77.92 mph (125.41 km/h)
75 mph (120.7 km/h)83.49 mph (134.37 km/h)
80 mph (128.75 km/h)89.06 mph (143.32 km/h)
85 mph (136.79 km/h)94.62 mph (152.28 km/h)
90 mph (144.84 km/h)100.19 mph (161.24 km/h)
95 mph (152.89 km/h)105.75 mph (170.2 km/h)
100 mph (160.93 km/h)111.32 mph (179.15 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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