Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
170/80r15 vs 195/65r15 Tire Comparison Side By Side
  170/80-15 195/65-15 Difference
Diameter inches (mm) 25.71 (653) 24.98 (634.5) -0.73 (-18.5) -2.8%
Width inches (mm) 6.69 (170) 7.68 (195) 0.98 (25) 14.7%
Circum. inches (mm) 80.77 (2051.46) 78.48 (1993.34) -2.29 (-58.12) -2.8%
Sidewall Height inches (mm) 5.35 (136) 4.99 (126.75) -0.36 (-9.25) -6.8%
Revolutions per mile (km) 784.49 (487.46) 807.36 (501.67) 22.87 (14.21) 2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.43 mph (31.28 km/h)
25 mph (40.23 km/h)24.29 mph (39.09 km/h)
30 mph (48.28 km/h)29.15 mph (46.91 km/h)
35 mph (56.33 km/h)34.01 mph (54.73 km/h)
40 mph (64.37 km/h)38.87 mph (62.55 km/h)
45 mph (72.42 km/h)43.73 mph (70.37 km/h)
50 mph (80.47 km/h)48.58 mph (78.19 km/h)
55 mph (88.51 km/h)53.44 mph (86.01 km/h)
60 mph (96.56 km/h)58.3 mph (93.83 km/h)
65 mph (104.61 km/h)63.16 mph (101.64 km/h)
70 mph (112.65 km/h)68.02 mph (109.46 km/h)
75 mph (120.7 km/h)72.88 mph (117.28 km/h)
80 mph (128.75 km/h)77.73 mph (125.1 km/h)
85 mph (136.79 km/h)82.59 mph (132.92 km/h)
90 mph (144.84 km/h)87.45 mph (140.74 km/h)
95 mph (152.89 km/h)92.31 mph (148.56 km/h)
100 mph (160.93 km/h)97.17 mph (156.38 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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