Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/30r21 vs 295/35r21 Tire Comparison Side By Side
  325/30-21 295/35-21 Difference
Diameter inches (mm) 28.68 (728.4) 29.13 (739.9) 0.45 (11.5) 1.6%
Width inches (mm) 12.8 (325) 11.61 (295) -1.18 (-30) -9.2%
Circum. inches (mm) 90.09 (2288.34) 91.51 (2324.46) 1.42 (36.13) 1.6%
Sidewall Height inches (mm) 3.84 (97.5) 4.06 (103.25) 0.23 (5.75) 5.9%
Revolutions per mile (km) 703.28 (437) 692.35 (430.21) -10.93 (-6.79) -1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.32 mph (32.7 km/h)
25 mph (40.23 km/h)25.39 mph (40.87 km/h)
30 mph (48.28 km/h)30.47 mph (49.04 km/h)
35 mph (56.33 km/h)35.55 mph (57.22 km/h)
40 mph (64.37 km/h)40.63 mph (65.39 km/h)
45 mph (72.42 km/h)45.71 mph (73.56 km/h)
50 mph (80.47 km/h)50.79 mph (81.74 km/h)
55 mph (88.51 km/h)55.87 mph (89.91 km/h)
60 mph (96.56 km/h)60.95 mph (98.09 km/h)
65 mph (104.61 km/h)66.03 mph (106.26 km/h)
70 mph (112.65 km/h)71.11 mph (114.43 km/h)
75 mph (120.7 km/h)76.18 mph (122.61 km/h)
80 mph (128.75 km/h)81.26 mph (130.78 km/h)
85 mph (136.79 km/h)86.34 mph (138.95 km/h)
90 mph (144.84 km/h)91.42 mph (147.13 km/h)
95 mph (152.89 km/h)96.5 mph (155.3 km/h)
100 mph (160.93 km/h)101.58 mph (163.48 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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