Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r19.5 vs 265/75r19.5 Tire Comparison Side By Side
  245/75-19.5 265/75-19.5 Difference
Diameter inches (mm) 33.97 (862.8) 35.15 (892.8) 1.18 (30) 3.5%
Width inches (mm) 9.65 (245) 10.43 (265) 0.79 (20) 8.2%
Circum. inches (mm) 106.72 (2710.57) 110.43 (2804.81) 3.71 (94.25) 3.5%
Sidewall Height inches (mm) 7.23 (183.75) 7.82 (198.75) 0.59 (15) 8.2%
Revolutions per mile (km) 593.73 (368.93) 573.78 (356.53) -19.95 (-12.4) -3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.7 mph (33.31 km/h)
25 mph (40.23 km/h)25.87 mph (41.63 km/h)
30 mph (48.28 km/h)31.04 mph (49.96 km/h)
35 mph (56.33 km/h)36.22 mph (58.29 km/h)
40 mph (64.37 km/h)41.39 mph (66.61 km/h)
45 mph (72.42 km/h)46.56 mph (74.94 km/h)
50 mph (80.47 km/h)51.74 mph (83.27 km/h)
55 mph (88.51 km/h)56.91 mph (91.59 km/h)
60 mph (96.56 km/h)62.09 mph (99.92 km/h)
65 mph (104.61 km/h)67.26 mph (108.24 km/h)
70 mph (112.65 km/h)72.43 mph (116.57 km/h)
75 mph (120.7 km/h)77.61 mph (124.9 km/h)
80 mph (128.75 km/h)82.78 mph (133.22 km/h)
85 mph (136.79 km/h)87.96 mph (141.55 km/h)
90 mph (144.84 km/h)93.13 mph (149.88 km/h)
95 mph (152.89 km/h)98.3 mph (158.2 km/h)
100 mph (160.93 km/h)103.48 mph (166.53 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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