Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/70r15 vs 255/75r15 Tire Comparison Side By Side
  255/70-15 255/75-15 Difference
Diameter inches (mm) 29.06 (738) 30.06 (763.5) 1 (25.5) 3.5%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 91.28 (2318.5) 94.43 (2398.61) 3.15 (80.11) 3.5%
Sidewall Height inches (mm) 7.03 (178.5) 7.53 (191.25) 0.5 (12.75) 7.1%
Revolutions per mile (km) 694.13 (431.31) 670.95 (416.91) -23.18 (-14.41) -3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.69 mph (33.3 km/h)
25 mph (40.23 km/h)25.86 mph (41.62 km/h)
30 mph (48.28 km/h)31.04 mph (49.95 km/h)
35 mph (56.33 km/h)36.21 mph (58.27 km/h)
40 mph (64.37 km/h)41.38 mph (66.6 km/h)
45 mph (72.42 km/h)46.55 mph (74.92 km/h)
50 mph (80.47 km/h)51.73 mph (83.25 km/h)
55 mph (88.51 km/h)56.9 mph (91.57 km/h)
60 mph (96.56 km/h)62.07 mph (99.9 km/h)
65 mph (104.61 km/h)67.25 mph (108.22 km/h)
70 mph (112.65 km/h)72.42 mph (116.55 km/h)
75 mph (120.7 km/h)77.59 mph (124.87 km/h)
80 mph (128.75 km/h)82.76 mph (133.2 km/h)
85 mph (136.79 km/h)87.94 mph (141.52 km/h)
90 mph (144.84 km/h)93.11 mph (149.85 km/h)
95 mph (152.89 km/h)98.28 mph (158.17 km/h)
100 mph (160.93 km/h)103.46 mph (166.5 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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