Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/25r23 vs 320/85r20 Tire Comparison Side By Side
  315/25-23 320/85-20 Difference
Diameter inches (mm) 29.2 (741.7) 41.42 (1052) 12.22 (310.3) 41.8%
Width inches (mm) 12.4 (315) 12.6 (320) 0.2 (5) 1.6%
Circum. inches (mm) 91.74 (2330.12) 130.12 (3304.96) 38.38 (974.84) 41.8%
Sidewall Height inches (mm) 3.1 (78.75) 10.71 (272) 7.61 (193.25) 245.4%
Revolutions per mile (km) 690.67 (429.16) 486.95 (302.58) -203.72 (-126.59) -29.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)28.37 mph (45.65 km/h)
25 mph (40.23 km/h)35.46 mph (57.07 km/h)
30 mph (48.28 km/h)42.55 mph (68.48 km/h)
35 mph (56.33 km/h)49.64 mph (79.89 km/h)
40 mph (64.37 km/h)56.73 mph (91.31 km/h)
45 mph (72.42 km/h)63.83 mph (102.72 km/h)
50 mph (80.47 km/h)70.92 mph (114.13 km/h)
55 mph (88.51 km/h)78.01 mph (125.55 km/h)
60 mph (96.56 km/h)85.1 mph (136.96 km/h)
65 mph (104.61 km/h)92.19 mph (148.37 km/h)
70 mph (112.65 km/h)99.29 mph (159.78 km/h)
75 mph (120.7 km/h)106.38 mph (171.2 km/h)
80 mph (128.75 km/h)113.47 mph (182.61 km/h)
85 mph (136.79 km/h)120.56 mph (194.02 km/h)
90 mph (144.84 km/h)127.65 mph (205.44 km/h)
95 mph (152.89 km/h)134.74 mph (216.85 km/h)
100 mph (160.93 km/h)141.84 mph (228.26 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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