Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/75r16 vs 265/75r16 Tire Comparison Side By Side
  305/75-16 265/75-16 Difference
Diameter inches (mm) 34.01 (863.9) 31.65 (803.9) -2.36 (-60) -6.9%
Width inches (mm) 12.01 (305) 10.43 (265) -1.57 (-40) -13.1%
Circum. inches (mm) 106.85 (2714.02) 99.43 (2525.53) -7.42 (-188.5) -6.9%
Sidewall Height inches (mm) 9.01 (228.75) 7.82 (198.75) -1.18 (-30) -13.1%
Revolutions per mile (km) 592.97 (368.46) 637.23 (395.96) 44.26 (27.5) 7.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.61 mph (29.95 km/h)
25 mph (40.23 km/h)23.26 mph (37.44 km/h)
30 mph (48.28 km/h)27.92 mph (44.93 km/h)
35 mph (56.33 km/h)32.57 mph (52.42 km/h)
40 mph (64.37 km/h)37.22 mph (59.9 km/h)
45 mph (72.42 km/h)41.87 mph (67.39 km/h)
50 mph (80.47 km/h)46.53 mph (74.88 km/h)
55 mph (88.51 km/h)51.18 mph (82.37 km/h)
60 mph (96.56 km/h)55.83 mph (89.85 km/h)
65 mph (104.61 km/h)60.49 mph (97.34 km/h)
70 mph (112.65 km/h)65.14 mph (104.83 km/h)
75 mph (120.7 km/h)69.79 mph (112.32 km/h)
80 mph (128.75 km/h)74.44 mph (119.81 km/h)
85 mph (136.79 km/h)79.1 mph (127.29 km/h)
90 mph (144.84 km/h)83.75 mph (134.78 km/h)
95 mph (152.89 km/h)88.4 mph (142.27 km/h)
100 mph (160.93 km/h)93.05 mph (149.76 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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