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 275/40r19 Tire Comparison Side By Side
  315/40-19 275/40-19 Difference
Diameter inches (mm) 28.92 (734.6) 27.66 (702.6) -1.26 (-32) -4.4%
Width inches (mm) 12.4 (315) 10.83 (275) -1.57 (-40) -12.7%
Circum. inches (mm) 90.86 (2307.81) 86.9 (2207.28) -3.96 (-100.53) -4.4%
Sidewall Height inches (mm) 4.96 (126) 4.33 (110) -0.63 (-16) -12.7%
Revolutions per mile (km) 697.35 (433.31) 729.11 (453.04) 31.76 (19.74) 4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.13 mph (30.78 km/h)
25 mph (40.23 km/h)23.91 mph (38.48 km/h)
30 mph (48.28 km/h)28.69 mph (46.18 km/h)
35 mph (56.33 km/h)33.48 mph (53.87 km/h)
40 mph (64.37 km/h)38.26 mph (61.57 km/h)
45 mph (72.42 km/h)43.04 mph (69.27 km/h)
50 mph (80.47 km/h)47.82 mph (76.96 km/h)
55 mph (88.51 km/h)52.6 mph (84.66 km/h)
60 mph (96.56 km/h)57.39 mph (92.35 km/h)
65 mph (104.61 km/h)62.17 mph (100.05 km/h)
70 mph (112.65 km/h)66.95 mph (107.75 km/h)
75 mph (120.7 km/h)71.73 mph (115.44 km/h)
80 mph (128.75 km/h)76.52 mph (123.14 km/h)
85 mph (136.79 km/h)81.3 mph (130.84 km/h)
90 mph (144.84 km/h)86.08 mph (138.53 km/h)
95 mph (152.89 km/h)90.86 mph (146.23 km/h)
100 mph (160.93 km/h)95.64 mph (153.92 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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