Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r17 vs 255/70r17 Tire Comparison Side By Side
  245/75-17 255/70-17 Difference
Diameter inches (mm) 31.47 (799.3) 31.06 (788.8) -0.41 (-10.5) -1.3%
Width inches (mm) 9.65 (245) 10.04 (255) 0.39 (10) 4.1%
Circum. inches (mm) 98.86 (2511.08) 97.56 (2478.09) -1.3 (-32.99) -1.3%
Sidewall Height inches (mm) 7.23 (183.75) 7.03 (178.5) -0.21 (-5.25) -2.9%
Revolutions per mile (km) 640.9 (398.24) 649.43 (403.54) 8.53 (5.3) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.74 mph (31.76 km/h)
25 mph (40.23 km/h)24.67 mph (39.71 km/h)
30 mph (48.28 km/h)29.61 mph (47.65 km/h)
35 mph (56.33 km/h)34.54 mph (55.59 km/h)
40 mph (64.37 km/h)39.47 mph (63.53 km/h)
45 mph (72.42 km/h)44.41 mph (71.47 km/h)
50 mph (80.47 km/h)49.34 mph (79.41 km/h)
55 mph (88.51 km/h)54.28 mph (87.35 km/h)
60 mph (96.56 km/h)59.21 mph (95.29 km/h)
65 mph (104.61 km/h)64.15 mph (103.23 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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