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 255/50r22.5 Tire Comparison Side By Side
  355/25-21 255/50-22.5 Difference
Diameter inches (mm) 27.99 (710.9) 32.54 (826.5) 4.55 (115.6) 16.3%
Width inches (mm) 13.98 (355) 10.04 (255) -3.94 (-100) -28.2%
Circum. inches (mm) 87.93 (2233.36) 102.23 (2596.53) 14.3 (363.17) 16.3%
Sidewall Height inches (mm) 3.49 (88.75) 5.02 (127.5) 1.53 (38.75) 43.7%
Revolutions per mile (km) 720.59 (447.76) 619.81 (385.13) -100.79 (-62.63) -14%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.25 mph (37.42 km/h)
25 mph (40.23 km/h)29.07 mph (46.78 km/h)
30 mph (48.28 km/h)34.88 mph (56.13 km/h)
35 mph (56.33 km/h)40.69 mph (65.49 km/h)
40 mph (64.37 km/h)46.5 mph (74.84 km/h)
45 mph (72.42 km/h)52.32 mph (84.2 km/h)
50 mph (80.47 km/h)58.13 mph (93.55 km/h)
55 mph (88.51 km/h)63.94 mph (102.91 km/h)
60 mph (96.56 km/h)69.76 mph (112.26 km/h)
65 mph (104.61 km/h)75.57 mph (121.62 km/h)
70 mph (112.65 km/h)81.38 mph (130.97 km/h)
75 mph (120.7 km/h)87.2 mph (140.33 km/h)
80 mph (128.75 km/h)93.01 mph (149.68 km/h)
85 mph (136.79 km/h)98.82 mph (159.04 km/h)
90 mph (144.84 km/h)104.63 mph (168.39 km/h)
95 mph (152.89 km/h)110.45 mph (177.75 km/h)
100 mph (160.93 km/h)116.26 mph (187.1 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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