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 215/85r16 Tire Comparison Side By Side
  215/80-16 215/85-16 Difference
Diameter inches (mm) 29.54 (750.4) 30.39 (771.9) 0.85 (21.5) 2.9%
Width inches (mm) 8.46 (215) 8.46 (215) 0 (0) 0%
Circum. inches (mm) 92.81 (2357.45) 95.47 (2425) 2.66 (67.54) 2.9%
Sidewall Height inches (mm) 6.77 (172) 7.19 (182.75) 0.42 (10.75) 6.3%
Revolutions per mile (km) 682.66 (424.19) 663.65 (412.37) -19.01 (-11.82) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.57 mph (33.11 km/h)
25 mph (40.23 km/h)25.72 mph (41.39 km/h)
30 mph (48.28 km/h)30.86 mph (49.66 km/h)
35 mph (56.33 km/h)36 mph (57.94 km/h)
40 mph (64.37 km/h)41.15 mph (66.22 km/h)
45 mph (72.42 km/h)46.29 mph (74.5 km/h)
50 mph (80.47 km/h)51.43 mph (82.77 km/h)
55 mph (88.51 km/h)56.58 mph (91.05 km/h)
60 mph (96.56 km/h)61.72 mph (99.33 km/h)
65 mph (104.61 km/h)66.86 mph (107.6 km/h)
70 mph (112.65 km/h)72.01 mph (115.88 km/h)
75 mph (120.7 km/h)77.15 mph (124.16 km/h)
80 mph (128.75 km/h)82.29 mph (132.44 km/h)
85 mph (136.79 km/h)87.44 mph (140.71 km/h)
90 mph (144.84 km/h)92.58 mph (148.99 km/h)
95 mph (152.89 km/h)97.72 mph (157.27 km/h)
100 mph (160.93 km/h)102.87 mph (165.55 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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