Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/70r18 vs 215/60r16 Tire Comparison Side By Side
  125/70-18 215/60-16 Difference
Diameter inches (mm) 24.89 (632.2) 26.16 (664.4) 1.27 (32.2) 5.1%
Width inches (mm) 4.92 (125) 8.46 (215) 3.54 (90) 72%
Circum. inches (mm) 78.19 (1986.11) 82.18 (2087.27) 3.98 (101.16) 5.1%
Sidewall Height inches (mm) 3.44 (87.5) 5.08 (129) 1.63 (41.5) 47.4%
Revolutions per mile (km) 810.3 (503.49) 771.03 (479.09) -39.27 (-24.4) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.02 mph (33.83 km/h)
25 mph (40.23 km/h)26.27 mph (42.28 km/h)
30 mph (48.28 km/h)31.53 mph (50.74 km/h)
35 mph (56.33 km/h)36.78 mph (59.2 km/h)
40 mph (64.37 km/h)42.04 mph (67.65 km/h)
45 mph (72.42 km/h)47.29 mph (76.11 km/h)
50 mph (80.47 km/h)52.55 mph (84.57 km/h)
55 mph (88.51 km/h)57.8 mph (93.02 km/h)
60 mph (96.56 km/h)63.06 mph (101.48 km/h)
65 mph (104.61 km/h)68.31 mph (109.94 km/h)
70 mph (112.65 km/h)73.57 mph (118.39 km/h)
75 mph (120.7 km/h)78.82 mph (126.85 km/h)
80 mph (128.75 km/h)84.07 mph (135.31 km/h)
85 mph (136.79 km/h)89.33 mph (143.76 km/h)
90 mph (144.84 km/h)94.58 mph (152.22 km/h)
95 mph (152.89 km/h)99.84 mph (160.68 km/h)
100 mph (160.93 km/h)105.09 mph (169.13 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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