Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/70r15 vs 195/65r15 Tire Comparison Side By Side
  145/70-15 195/65-15 Difference
Diameter inches (mm) 22.99 (584) 24.98 (634.5) 1.99 (50.5) 8.6%
Width inches (mm) 5.71 (145) 7.68 (195) 1.97 (50) 34.5%
Circum. inches (mm) 72.23 (1834.69) 78.48 (1993.34) 6.25 (158.65) 8.6%
Sidewall Height inches (mm) 4 (101.5) 4.99 (126.75) 0.99 (25.25) 24.9%
Revolutions per mile (km) 877.17 (545.05) 807.36 (501.67) -69.81 (-43.38) -8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.73 mph (34.97 km/h)
25 mph (40.23 km/h)27.16 mph (43.71 km/h)
30 mph (48.28 km/h)32.59 mph (52.46 km/h)
35 mph (56.33 km/h)38.03 mph (61.2 km/h)
40 mph (64.37 km/h)43.46 mph (69.94 km/h)
45 mph (72.42 km/h)48.89 mph (78.68 km/h)
50 mph (80.47 km/h)54.32 mph (87.43 km/h)
55 mph (88.51 km/h)59.76 mph (96.17 km/h)
60 mph (96.56 km/h)65.19 mph (104.91 km/h)
65 mph (104.61 km/h)70.62 mph (113.65 km/h)
70 mph (112.65 km/h)76.05 mph (122.4 km/h)
75 mph (120.7 km/h)81.49 mph (131.14 km/h)
80 mph (128.75 km/h)86.92 mph (139.88 km/h)
85 mph (136.79 km/h)92.35 mph (148.62 km/h)
90 mph (144.84 km/h)97.78 mph (157.37 km/h)
95 mph (152.89 km/h)103.21 mph (166.11 km/h)
100 mph (160.93 km/h)108.65 mph (174.85 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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