Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
355/25r21 vs 265/65r17 Tire Comparison Side By Side
  355/25-21 265/65-17 Difference
Diameter inches (mm) 27.99 (710.9) 30.56 (776.3) 2.57 (65.4) 9.2%
Width inches (mm) 13.98 (355) 10.43 (265) -3.54 (-90) -25.4%
Circum. inches (mm) 87.93 (2233.36) 96.02 (2438.82) 8.09 (205.46) 9.2%
Sidewall Height inches (mm) 3.49 (88.75) 6.78 (172.25) 3.29 (83.5) 94.1%
Revolutions per mile (km) 720.59 (447.76) 659.89 (410.03) -60.71 (-37.72) -8.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.84 mph (35.15 km/h)
25 mph (40.23 km/h)27.3 mph (43.94 km/h)
30 mph (48.28 km/h)32.76 mph (52.72 km/h)
35 mph (56.33 km/h)38.22 mph (61.51 km/h)
40 mph (64.37 km/h)43.68 mph (70.3 km/h)
45 mph (72.42 km/h)49.14 mph (79.08 km/h)
50 mph (80.47 km/h)54.6 mph (87.87 km/h)
55 mph (88.51 km/h)60.06 mph (96.66 km/h)
60 mph (96.56 km/h)65.52 mph (105.44 km/h)
65 mph (104.61 km/h)70.98 mph (114.23 km/h)
70 mph (112.65 km/h)76.44 mph (123.02 km/h)
75 mph (120.7 km/h)81.9 mph (131.81 km/h)
80 mph (128.75 km/h)87.36 mph (140.59 km/h)
85 mph (136.79 km/h)92.82 mph (149.38 km/h)
90 mph (144.84 km/h)98.28 mph (158.17 km/h)
95 mph (152.89 km/h)103.74 mph (166.95 km/h)
100 mph (160.93 km/h)109.2 mph (175.74 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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