Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/75r15 vs 195/65r15 Tire Comparison Side By Side
  165/75-15 195/65-15 Difference
Diameter inches (mm) 24.74 (628.5) 24.98 (634.5) 0.24 (6) 1%
Width inches (mm) 6.5 (165) 7.68 (195) 1.18 (30) 18.2%
Circum. inches (mm) 77.74 (1974.49) 78.48 (1993.34) 0.74 (18.85) 1%
Sidewall Height inches (mm) 4.87 (123.75) 4.99 (126.75) 0.12 (3) 2.4%
Revolutions per mile (km) 815.07 (506.46) 807.36 (501.67) -7.71 (-4.79) -0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.19 mph (32.49 km/h)
25 mph (40.23 km/h)25.24 mph (40.62 km/h)
30 mph (48.28 km/h)30.29 mph (48.74 km/h)
35 mph (56.33 km/h)35.33 mph (56.86 km/h)
40 mph (64.37 km/h)40.38 mph (64.99 km/h)
45 mph (72.42 km/h)45.43 mph (73.11 km/h)
50 mph (80.47 km/h)50.48 mph (81.24 km/h)
55 mph (88.51 km/h)55.53 mph (89.36 km/h)
60 mph (96.56 km/h)60.57 mph (97.48 km/h)
65 mph (104.61 km/h)65.62 mph (105.61 km/h)
70 mph (112.65 km/h)70.67 mph (113.73 km/h)
75 mph (120.7 km/h)75.72 mph (121.85 km/h)
80 mph (128.75 km/h)80.76 mph (129.98 km/h)
85 mph (136.79 km/h)85.81 mph (138.1 km/h)
90 mph (144.84 km/h)90.86 mph (146.22 km/h)
95 mph (152.89 km/h)95.91 mph (154.35 km/h)
100 mph (160.93 km/h)100.95 mph (162.47 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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