Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
190/55r15 vs 265/30r15 Tire Comparison Side By Side
  190/55-15 265/30-15 Difference
Diameter inches (mm) 23.23 (590) 21.26 (540) -1.97 (-50) -8.5%
Width inches (mm) 7.48 (190) 10.43 (265) 2.95 (75) 39.5%
Circum. inches (mm) 72.97 (1853.54) 66.79 (1696.46) -6.18 (-157.08) -8.5%
Sidewall Height inches (mm) 4.11 (104.5) 3.13 (79.5) -0.98 (-25) -23.9%
Revolutions per mile (km) 868.25 (539.51) 948.65 (589.46) 80.39 (49.95) 9.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.31 mph (29.46 km/h)
25 mph (40.23 km/h)22.88 mph (36.82 km/h)
30 mph (48.28 km/h)27.46 mph (44.19 km/h)
35 mph (56.33 km/h)32.03 mph (51.55 km/h)
40 mph (64.37 km/h)36.61 mph (58.92 km/h)
45 mph (72.42 km/h)41.19 mph (66.28 km/h)
50 mph (80.47 km/h)45.76 mph (73.65 km/h)
55 mph (88.51 km/h)50.34 mph (81.01 km/h)
60 mph (96.56 km/h)54.92 mph (88.38 km/h)
65 mph (104.61 km/h)59.49 mph (95.74 km/h)
70 mph (112.65 km/h)64.07 mph (103.11 km/h)
75 mph (120.7 km/h)68.64 mph (110.47 km/h)
80 mph (128.75 km/h)73.22 mph (117.84 km/h)
85 mph (136.79 km/h)77.8 mph (125.2 km/h)
90 mph (144.84 km/h)82.37 mph (132.57 km/h)
95 mph (152.89 km/h)86.95 mph (139.93 km/h)
100 mph (160.93 km/h)91.53 mph (147.3 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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