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 310/70r17 Tire Comparison Side By Side
  245/75-17 310/70-17 Difference
Diameter inches (mm) 31.47 (799.3) 34.09 (865.8) 2.62 (66.5) 8.3%
Width inches (mm) 9.65 (245) 12.2 (310) 2.56 (65) 26.5%
Circum. inches (mm) 98.86 (2511.08) 107.09 (2719.99) 8.23 (208.92) 8.3%
Sidewall Height inches (mm) 7.23 (183.75) 8.54 (217) 1.31 (33.25) 18.1%
Revolutions per mile (km) 640.9 (398.24) 591.67 (367.65) -49.23 (-30.59) -7.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.66 mph (34.86 km/h)
25 mph (40.23 km/h)27.08 mph (43.58 km/h)
30 mph (48.28 km/h)32.5 mph (52.3 km/h)
35 mph (56.33 km/h)37.91 mph (61.01 km/h)
40 mph (64.37 km/h)43.33 mph (69.73 km/h)
45 mph (72.42 km/h)48.74 mph (78.45 km/h)
50 mph (80.47 km/h)54.16 mph (87.16 km/h)
55 mph (88.51 km/h)59.58 mph (95.88 km/h)
60 mph (96.56 km/h)64.99 mph (104.59 km/h)
65 mph (104.61 km/h)70.41 mph (113.31 km/h)
70 mph (112.65 km/h)75.82 mph (122.03 km/h)
75 mph (120.7 km/h)81.24 mph (130.74 km/h)
80 mph (128.75 km/h)86.66 mph (139.46 km/h)
85 mph (136.79 km/h)92.07 mph (148.18 km/h)
90 mph (144.84 km/h)97.49 mph (156.89 km/h)
95 mph (152.89 km/h)102.9 mph (165.61 km/h)
100 mph (160.93 km/h)108.32 mph (174.32 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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