Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/75r22.5 vs 265/70r19.5 Tire Comparison Side By Side
  265/75-22.5 265/70-19.5 Difference
Diameter inches (mm) 38.15 (969) 34.11 (866.3) -4.04 (-102.7) -10.6%
Width inches (mm) 10.43 (265) 10.43 (265) 0 (0) 0%
Circum. inches (mm) 119.85 (3044.2) 107.15 (2721.56) -12.7 (-322.64) -10.6%
Sidewall Height inches (mm) 7.82 (198.75) 7.3 (185.5) -0.52 (-13.25) -6.7%
Revolutions per mile (km) 528.66 (328.49) 591.33 (367.44) 62.67 (38.94) 11.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.88 mph (28.78 km/h)
25 mph (40.23 km/h)22.35 mph (35.97 km/h)
30 mph (48.28 km/h)26.82 mph (43.16 km/h)
35 mph (56.33 km/h)31.29 mph (50.36 km/h)
40 mph (64.37 km/h)35.76 mph (57.55 km/h)
45 mph (72.42 km/h)40.23 mph (64.75 km/h)
50 mph (80.47 km/h)44.7 mph (71.94 km/h)
55 mph (88.51 km/h)49.17 mph (79.13 km/h)
60 mph (96.56 km/h)53.64 mph (86.33 km/h)
65 mph (104.61 km/h)58.11 mph (93.52 km/h)
70 mph (112.65 km/h)62.58 mph (100.71 km/h)
75 mph (120.7 km/h)67.05 mph (107.91 km/h)
80 mph (128.75 km/h)71.52 mph (115.1 km/h)
85 mph (136.79 km/h)75.99 mph (122.3 km/h)
90 mph (144.84 km/h)80.46 mph (129.49 km/h)
95 mph (152.89 km/h)84.93 mph (136.68 km/h)
100 mph (160.93 km/h)89.4 mph (143.88 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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