Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/35r28 vs 305/40r26 Tire Comparison Side By Side
  325/35-28 305/40-26 Difference
Diameter inches (mm) 36.96 (938.7) 35.61 (904.4) -1.35 (-34.3) -3.7%
Width inches (mm) 12.8 (325) 12.01 (305) -0.79 (-20) -6.2%
Circum. inches (mm) 116.1 (2949.01) 111.86 (2841.26) -4.24 (-107.76) -3.7%
Sidewall Height inches (mm) 4.48 (113.75) 4.8 (122) 0.32 (8.25) 7.3%
Revolutions per mile (km) 545.72 (339.1) 566.42 (351.96) 20.7 (12.86) 3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.27 mph (31.01 km/h)
25 mph (40.23 km/h)24.09 mph (38.76 km/h)
30 mph (48.28 km/h)28.9 mph (46.52 km/h)
35 mph (56.33 km/h)33.72 mph (54.27 km/h)
40 mph (64.37 km/h)38.54 mph (62.02 km/h)
45 mph (72.42 km/h)43.36 mph (69.77 km/h)
50 mph (80.47 km/h)48.17 mph (77.53 km/h)
55 mph (88.51 km/h)52.99 mph (85.28 km/h)
60 mph (96.56 km/h)57.81 mph (93.03 km/h)
65 mph (104.61 km/h)62.62 mph (100.79 km/h)
70 mph (112.65 km/h)67.44 mph (108.54 km/h)
75 mph (120.7 km/h)72.26 mph (116.29 km/h)
80 mph (128.75 km/h)77.08 mph (124.04 km/h)
85 mph (136.79 km/h)81.89 mph (131.8 km/h)
90 mph (144.84 km/h)86.71 mph (139.55 km/h)
95 mph (152.89 km/h)91.53 mph (147.3 km/h)
100 mph (160.93 km/h)96.35 mph (155.05 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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