Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/60r15 vs 300/40r15 Tire Comparison Side By Side
  205/60-15 300/40-15 Difference
Diameter inches (mm) 24.69 (627) 24.45 (621) -0.24 (-6) -1%
Width inches (mm) 8.07 (205) 11.81 (300) 3.74 (95) 46.3%
Circum. inches (mm) 77.55 (1969.78) 76.81 (1950.93) -0.74 (-18.85) -1%
Sidewall Height inches (mm) 4.84 (123) 4.72 (120) -0.12 (-3) -2.4%
Revolutions per mile (km) 817.02 (507.67) 824.91 (512.58) 7.89 (4.91) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.81 mph (31.88 km/h)
25 mph (40.23 km/h)24.76 mph (39.85 km/h)
30 mph (48.28 km/h)29.71 mph (47.82 km/h)
35 mph (56.33 km/h)34.67 mph (55.79 km/h)
40 mph (64.37 km/h)39.62 mph (63.76 km/h)
45 mph (72.42 km/h)44.57 mph (71.73 km/h)
50 mph (80.47 km/h)49.52 mph (79.7 km/h)
55 mph (88.51 km/h)54.47 mph (87.67 km/h)
60 mph (96.56 km/h)59.43 mph (95.64 km/h)
65 mph (104.61 km/h)64.38 mph (103.61 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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