Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/55r20 vs 275/65r20 Tire Comparison Side By Side
  265/55-20 275/65-20 Difference
Diameter inches (mm) 31.48 (799.5) 34.07 (865.5) 2.6 (66) 8.3%
Width inches (mm) 10.43 (265) 10.83 (275) 0.39 (10) 3.8%
Circum. inches (mm) 98.89 (2511.7) 107.05 (2719.05) 8.16 (207.35) 8.3%
Sidewall Height inches (mm) 5.74 (145.75) 7.04 (178.75) 1.3 (33) 22.6%
Revolutions per mile (km) 640.74 (398.14) 591.88 (367.78) -48.86 (-30.36) -7.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.65 mph (34.84 km/h)
25 mph (40.23 km/h)27.06 mph (43.56 km/h)
30 mph (48.28 km/h)32.48 mph (52.27 km/h)
35 mph (56.33 km/h)37.89 mph (60.98 km/h)
40 mph (64.37 km/h)43.3 mph (69.69 km/h)
45 mph (72.42 km/h)48.71 mph (78.4 km/h)
50 mph (80.47 km/h)54.13 mph (87.11 km/h)
55 mph (88.51 km/h)59.54 mph (95.82 km/h)
60 mph (96.56 km/h)64.95 mph (104.53 km/h)
65 mph (104.61 km/h)70.37 mph (113.24 km/h)
70 mph (112.65 km/h)75.78 mph (121.95 km/h)
75 mph (120.7 km/h)81.19 mph (130.67 km/h)
80 mph (128.75 km/h)86.6 mph (139.38 km/h)
85 mph (136.79 km/h)92.02 mph (148.09 km/h)
90 mph (144.84 km/h)97.43 mph (156.8 km/h)
95 mph (152.89 km/h)102.84 mph (165.51 km/h)
100 mph (160.93 km/h)108.26 mph (174.22 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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