Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/65r17 vs 255/65r17 Tire Comparison Side By Side
  245/65-17 255/65-17 Difference
Diameter inches (mm) 29.54 (750.3) 30.05 (763.3) 0.51 (13) 1.7%
Width inches (mm) 9.65 (245) 10.04 (255) 0.39 (10) 4.1%
Circum. inches (mm) 92.8 (2357.14) 94.41 (2397.98) 1.61 (40.84) 1.7%
Sidewall Height inches (mm) 6.27 (159.25) 6.53 (165.75) 0.26 (6.5) 4.1%
Revolutions per mile (km) 682.75 (424.24) 671.13 (417.02) -11.63 (-7.23) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.35 mph (32.74 km/h)
25 mph (40.23 km/h)25.43 mph (40.93 km/h)
30 mph (48.28 km/h)30.52 mph (49.12 km/h)
35 mph (56.33 km/h)35.61 mph (57.3 km/h)
40 mph (64.37 km/h)40.69 mph (65.49 km/h)
45 mph (72.42 km/h)45.78 mph (73.68 km/h)
50 mph (80.47 km/h)50.87 mph (81.86 km/h)
55 mph (88.51 km/h)55.95 mph (90.05 km/h)
60 mph (96.56 km/h)61.04 mph (98.23 km/h)
65 mph (104.61 km/h)66.13 mph (106.42 km/h)
70 mph (112.65 km/h)71.21 mph (114.61 km/h)
75 mph (120.7 km/h)76.3 mph (122.79 km/h)
80 mph (128.75 km/h)81.39 mph (130.98 km/h)
85 mph (136.79 km/h)86.47 mph (139.16 km/h)
90 mph (144.84 km/h)91.56 mph (147.35 km/h)
95 mph (152.89 km/h)96.65 mph (155.54 km/h)
100 mph (160.93 km/h)101.73 mph (163.72 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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