Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r16.5 vs 265/75r16.5 Tire Comparison Side By Side
  245/75-16.5 265/75-16.5 Difference
Diameter inches (mm) 30.97 (786.6) 32.15 (816.6) 1.18 (30) 3.8%
Width inches (mm) 9.65 (245) 10.43 (265) 0.79 (20) 8.2%
Circum. inches (mm) 97.29 (2471.18) 101 (2565.42) 3.71 (94.25) 3.8%
Sidewall Height inches (mm) 7.23 (183.75) 7.82 (198.75) 0.59 (15) 8.2%
Revolutions per mile (km) 651.25 (404.66) 627.32 (389.8) -23.93 (-14.87) -3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.76 mph (33.41 km/h)
25 mph (40.23 km/h)25.95 mph (41.77 km/h)
30 mph (48.28 km/h)31.14 mph (50.12 km/h)
35 mph (56.33 km/h)36.33 mph (58.48 km/h)
40 mph (64.37 km/h)41.53 mph (66.83 km/h)
45 mph (72.42 km/h)46.72 mph (75.18 km/h)
50 mph (80.47 km/h)51.91 mph (83.54 km/h)
55 mph (88.51 km/h)57.1 mph (91.89 km/h)
60 mph (96.56 km/h)62.29 mph (100.24 km/h)
65 mph (104.61 km/h)67.48 mph (108.6 km/h)
70 mph (112.65 km/h)72.67 mph (116.95 km/h)
75 mph (120.7 km/h)77.86 mph (125.3 km/h)
80 mph (128.75 km/h)83.05 mph (133.66 km/h)
85 mph (136.79 km/h)88.24 mph (142.01 km/h)
90 mph (144.84 km/h)93.43 mph (150.37 km/h)
95 mph (152.89 km/h)98.62 mph (158.72 km/h)
100 mph (160.93 km/h)103.81 mph (167.07 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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