Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/35r20 vs 275/35r20 Tire Comparison Side By Side
  255/35-20 275/35-20 Difference
Diameter inches (mm) 27.03 (686.5) 27.58 (700.5) 0.55 (14) 2%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 84.91 (2156.7) 86.64 (2200.69) 1.73 (43.98) 2%
Sidewall Height inches (mm) 3.51 (89.25) 3.79 (96.25) 0.28 (7) 7.8%
Revolutions per mile (km) 746.21 (463.67) 731.29 (454.4) -14.91 (-9.27) -2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.41 mph (32.84 km/h)
25 mph (40.23 km/h)25.51 mph (41.05 km/h)
30 mph (48.28 km/h)30.61 mph (49.27 km/h)
35 mph (56.33 km/h)35.71 mph (57.48 km/h)
40 mph (64.37 km/h)40.82 mph (65.69 km/h)
45 mph (72.42 km/h)45.92 mph (73.9 km/h)
50 mph (80.47 km/h)51.02 mph (82.11 km/h)
55 mph (88.51 km/h)56.12 mph (90.32 km/h)
60 mph (96.56 km/h)61.22 mph (98.53 km/h)
65 mph (104.61 km/h)66.33 mph (106.74 km/h)
70 mph (112.65 km/h)71.43 mph (114.95 km/h)
75 mph (120.7 km/h)76.53 mph (123.16 km/h)
80 mph (128.75 km/h)81.63 mph (131.37 km/h)
85 mph (136.79 km/h)86.73 mph (139.58 km/h)
90 mph (144.84 km/h)91.84 mph (147.8 km/h)
95 mph (152.89 km/h)96.94 mph (156.01 km/h)
100 mph (160.93 km/h)102.04 mph (164.22 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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