Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/80r16 vs 245/75r16 Tire Comparison Side By Side
  255/80-16 245/75-16 Difference
Diameter inches (mm) 32.06 (814.4) 30.47 (773.9) -1.59 (-40.5) -5%
Width inches (mm) 10.04 (255) 9.65 (245) -0.39 (-10) -3.9%
Circum. inches (mm) 100.73 (2558.51) 95.72 (2431.28) -5.01 (-127.23) -5%
Sidewall Height inches (mm) 8.03 (204) 7.23 (183.75) -0.8 (-20.25) -9.9%
Revolutions per mile (km) 629.02 (390.85) 661.93 (411.31) 32.92 (20.45) 5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.01 mph (30.59 km/h)
25 mph (40.23 km/h)23.76 mph (38.23 km/h)
30 mph (48.28 km/h)28.51 mph (45.88 km/h)
35 mph (56.33 km/h)33.26 mph (53.53 km/h)
40 mph (64.37 km/h)38.01 mph (61.17 km/h)
45 mph (72.42 km/h)42.76 mph (68.82 km/h)
50 mph (80.47 km/h)47.51 mph (76.47 km/h)
55 mph (88.51 km/h)52.26 mph (84.11 km/h)
60 mph (96.56 km/h)57.02 mph (91.76 km/h)
65 mph (104.61 km/h)61.77 mph (99.41 km/h)
70 mph (112.65 km/h)66.52 mph (107.05 km/h)
75 mph (120.7 km/h)71.27 mph (114.7 km/h)
80 mph (128.75 km/h)76.02 mph (122.35 km/h)
85 mph (136.79 km/h)80.77 mph (129.99 km/h)
90 mph (144.84 km/h)85.52 mph (137.64 km/h)
95 mph (152.89 km/h)90.28 mph (145.28 km/h)
100 mph (160.93 km/h)95.03 mph (152.93 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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