Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/60r18 vs 275/65r18 Tire Comparison Side By Side
  305/60-18 275/65-18 Difference
Diameter inches (mm) 32.41 (823.2) 32.07 (814.7) -0.33 (-8.5) -1%
Width inches (mm) 12.01 (305) 10.83 (275) -1.18 (-30) -9.8%
Circum. inches (mm) 101.82 (2586.16) 100.77 (2559.46) -1.05 (-26.7) -1%
Sidewall Height inches (mm) 7.2 (183) 7.04 (178.75) -0.17 (-4.25) -2.3%
Revolutions per mile (km) 622.29 (386.67) 628.78 (390.71) 6.49 (4.03) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.79 mph (31.85 km/h)
25 mph (40.23 km/h)24.74 mph (39.82 km/h)
30 mph (48.28 km/h)29.69 mph (47.78 km/h)
35 mph (56.33 km/h)34.64 mph (55.75 km/h)
40 mph (64.37 km/h)39.59 mph (63.71 km/h)
45 mph (72.42 km/h)44.54 mph (71.67 km/h)
50 mph (80.47 km/h)49.48 mph (79.64 km/h)
55 mph (88.51 km/h)54.43 mph (87.6 km/h)
60 mph (96.56 km/h)59.38 mph (95.56 km/h)
65 mph (104.61 km/h)64.33 mph (103.53 km/h)
70 mph (112.65 km/h)69.28 mph (111.49 km/h)
75 mph (120.7 km/h)74.23 mph (119.45 km/h)
80 mph (128.75 km/h)79.17 mph (127.42 km/h)
85 mph (136.79 km/h)84.12 mph (135.38 km/h)
90 mph (144.84 km/h)89.07 mph (143.35 km/h)
95 mph (152.89 km/h)94.02 mph (151.31 km/h)
100 mph (160.93 km/h)98.97 mph (159.27 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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