Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/40r19 vs 275/40r17 Tire Comparison Side By Side
  315/40-19 275/40-17 Difference
Diameter inches (mm) 28.92 (734.6) 25.66 (651.8) -3.26 (-82.8) -11.3%
Width inches (mm) 12.4 (315) 10.83 (275) -1.57 (-40) -12.7%
Circum. inches (mm) 90.86 (2307.81) 80.62 (2047.69) -10.24 (-260.12) -11.3%
Sidewall Height inches (mm) 4.96 (126) 4.33 (110) -0.63 (-16) -12.7%
Revolutions per mile (km) 697.35 (433.31) 785.93 (488.35) 88.59 (55.04) 12.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.75 mph (28.56 km/h)
25 mph (40.23 km/h)22.18 mph (35.7 km/h)
30 mph (48.28 km/h)26.62 mph (42.84 km/h)
35 mph (56.33 km/h)31.05 mph (49.98 km/h)
40 mph (64.37 km/h)35.49 mph (57.12 km/h)
45 mph (72.42 km/h)39.93 mph (64.26 km/h)
50 mph (80.47 km/h)44.36 mph (71.4 km/h)
55 mph (88.51 km/h)48.8 mph (78.54 km/h)
60 mph (96.56 km/h)53.24 mph (85.68 km/h)
65 mph (104.61 km/h)57.67 mph (92.82 km/h)
70 mph (112.65 km/h)62.11 mph (99.96 km/h)
75 mph (120.7 km/h)66.55 mph (107.1 km/h)
80 mph (128.75 km/h)70.98 mph (114.24 km/h)
85 mph (136.79 km/h)75.42 mph (121.38 km/h)
90 mph (144.84 km/h)79.86 mph (128.52 km/h)
95 mph (152.89 km/h)84.29 mph (135.66 km/h)
100 mph (160.93 km/h)88.73 mph (142.8 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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