Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/65r15 vs 245/60r15 Tire Comparison Side By Side
  205/65-15 245/60-15 Difference
Diameter inches (mm) 25.49 (647.5) 26.57 (675) 1.08 (27.5) 4.2%
Width inches (mm) 8.07 (205) 9.65 (245) 1.57 (40) 19.5%
Circum. inches (mm) 80.09 (2034.18) 83.49 (2120.58) 3.4 (86.39) 4.2%
Sidewall Height inches (mm) 5.25 (133.25) 5.79 (147) 0.54 (13.75) 10.3%
Revolutions per mile (km) 791.15 (491.6) 758.92 (471.57) -32.23 (-20.03) -4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.85 mph (33.55 km/h)
25 mph (40.23 km/h)26.06 mph (41.94 km/h)
30 mph (48.28 km/h)31.27 mph (50.33 km/h)
35 mph (56.33 km/h)36.49 mph (58.72 km/h)
40 mph (64.37 km/h)41.7 mph (67.11 km/h)
45 mph (72.42 km/h)46.91 mph (75.5 km/h)
50 mph (80.47 km/h)52.12 mph (83.88 km/h)
55 mph (88.51 km/h)57.34 mph (92.27 km/h)
60 mph (96.56 km/h)62.55 mph (100.66 km/h)
65 mph (104.61 km/h)67.76 mph (109.05 km/h)
70 mph (112.65 km/h)72.97 mph (117.44 km/h)
75 mph (120.7 km/h)78.19 mph (125.83 km/h)
80 mph (128.75 km/h)83.4 mph (134.22 km/h)
85 mph (136.79 km/h)88.61 mph (142.6 km/h)
90 mph (144.84 km/h)93.82 mph (150.99 km/h)
95 mph (152.89 km/h)99.03 mph (159.38 km/h)
100 mph (160.93 km/h)104.25 mph (167.77 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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