Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/65r16 vs 275/65r18 Tire Comparison Side By Side
  275/65-16 275/65-18 Difference
Diameter inches (mm) 30.07 (763.9) 32.07 (814.7) 2 (50.8) 6.7%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 94.48 (2399.86) 100.77 (2559.46) 6.28 (159.59) 6.7%
Sidewall Height inches (mm) 7.04 (178.75) 7.04 (178.75) 0 (0) 0%
Revolutions per mile (km) 670.6 (416.69) 628.78 (390.71) -41.81 (-25.98) -6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.33 mph (34.33 km/h)
25 mph (40.23 km/h)26.66 mph (42.91 km/h)
30 mph (48.28 km/h)32 mph (51.49 km/h)
35 mph (56.33 km/h)37.33 mph (60.07 km/h)
40 mph (64.37 km/h)42.66 mph (68.65 km/h)
45 mph (72.42 km/h)47.99 mph (77.24 km/h)
50 mph (80.47 km/h)53.33 mph (85.82 km/h)
55 mph (88.51 km/h)58.66 mph (94.4 km/h)
60 mph (96.56 km/h)63.99 mph (102.98 km/h)
65 mph (104.61 km/h)69.32 mph (111.56 km/h)
70 mph (112.65 km/h)74.66 mph (120.15 km/h)
75 mph (120.7 km/h)79.99 mph (128.73 km/h)
80 mph (128.75 km/h)85.32 mph (137.31 km/h)
85 mph (136.79 km/h)90.65 mph (145.89 km/h)
90 mph (144.84 km/h)95.99 mph (154.47 km/h)
95 mph (152.89 km/h)101.32 mph (163.06 km/h)
100 mph (160.93 km/h)106.65 mph (171.64 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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