Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/65r15 vs 195/65r15 Tire Comparison Side By Side
  145/65-15 195/65-15 Difference
Diameter inches (mm) 22.42 (569.5) 24.98 (634.5) 2.56 (65) 11.4%
Width inches (mm) 5.71 (145) 7.68 (195) 1.97 (50) 34.5%
Circum. inches (mm) 70.44 (1789.14) 78.48 (1993.34) 8.04 (204.2) 11.4%
Sidewall Height inches (mm) 3.71 (94.25) 4.99 (126.75) 1.28 (32.5) 34.5%
Revolutions per mile (km) 899.51 (558.93) 807.36 (501.67) -92.15 (-57.26) -10.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.28 mph (35.86 km/h)
25 mph (40.23 km/h)27.85 mph (44.83 km/h)
30 mph (48.28 km/h)33.42 mph (53.79 km/h)
35 mph (56.33 km/h)38.99 mph (62.76 km/h)
40 mph (64.37 km/h)44.57 mph (71.72 km/h)
45 mph (72.42 km/h)50.14 mph (80.69 km/h)
50 mph (80.47 km/h)55.71 mph (89.65 km/h)
55 mph (88.51 km/h)61.28 mph (98.62 km/h)
60 mph (96.56 km/h)66.85 mph (107.58 km/h)
65 mph (104.61 km/h)72.42 mph (116.55 km/h)
70 mph (112.65 km/h)77.99 mph (125.51 km/h)
75 mph (120.7 km/h)83.56 mph (134.48 km/h)
80 mph (128.75 km/h)89.13 mph (143.44 km/h)
85 mph (136.79 km/h)94.7 mph (152.41 km/h)
90 mph (144.84 km/h)100.27 mph (161.37 km/h)
95 mph (152.89 km/h)105.84 mph (170.34 km/h)
100 mph (160.93 km/h)111.41 mph (179.3 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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