Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/40r17 vs 275/40r17 Tire Comparison Side By Side
  245/40-17 275/40-17 Difference
Diameter inches (mm) 24.72 (627.8) 25.66 (651.8) 0.94 (24) 3.8%
Width inches (mm) 9.65 (245) 10.83 (275) 1.18 (30) 12.2%
Circum. inches (mm) 77.65 (1972.29) 80.62 (2047.69) 2.97 (75.4) 3.8%
Sidewall Height inches (mm) 3.86 (98) 4.33 (110) 0.47 (12) 12.2%
Revolutions per mile (km) 815.98 (507.02) 785.93 (488.35) -30.05 (-18.67) -3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.76 mph (33.42 km/h)
25 mph (40.23 km/h)25.96 mph (41.77 km/h)
30 mph (48.28 km/h)31.15 mph (50.13 km/h)
35 mph (56.33 km/h)36.34 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 (75.19 km/h)
50 mph (80.47 km/h)51.91 mph (83.54 km/h)
55 mph (88.51 km/h)57.1 mph (91.9 km/h)
60 mph (96.56 km/h)62.29 mph (100.25 km/h)
65 mph (104.61 km/h)67.48 mph (108.61 km/h)
70 mph (112.65 km/h)72.68 mph (116.96 km/h)
75 mph (120.7 km/h)77.87 mph (125.32 km/h)
80 mph (128.75 km/h)83.06 mph (133.67 km/h)
85 mph (136.79 km/h)88.25 mph (142.02 km/h)
90 mph (144.84 km/h)93.44 mph (150.38 km/h)
95 mph (152.89 km/h)98.63 mph (158.73 km/h)
100 mph (160.93 km/h)103.82 mph (167.09 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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