Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/40r22 vs 325/50r22 Tire Comparison Side By Side
  305/40-22 325/50-22 Difference
Diameter inches (mm) 31.61 (802.8) 34.8 (883.8) 3.19 (81) 10.1%
Width inches (mm) 12.01 (305) 12.8 (325) 0.79 (20) 6.6%
Circum. inches (mm) 99.29 (2522.07) 109.31 (2776.54) 10.02 (254.47) 10.1%
Sidewall Height inches (mm) 4.8 (122) 6.4 (162.5) 1.59 (40.5) 33.2%
Revolutions per mile (km) 638.1 (396.5) 579.62 (360.16) -58.48 (-36.34) -9.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.02 mph (35.43 km/h)
25 mph (40.23 km/h)27.52 mph (44.29 km/h)
30 mph (48.28 km/h)33.03 mph (53.15 km/h)
35 mph (56.33 km/h)38.53 mph (62.01 km/h)
40 mph (64.37 km/h)44.04 mph (70.87 km/h)
45 mph (72.42 km/h)49.54 mph (79.73 km/h)
50 mph (80.47 km/h)55.04 mph (88.59 km/h)
55 mph (88.51 km/h)60.55 mph (97.44 km/h)
60 mph (96.56 km/h)66.05 mph (106.3 km/h)
65 mph (104.61 km/h)71.56 mph (115.16 km/h)
70 mph (112.65 km/h)77.06 mph (124.02 km/h)
75 mph (120.7 km/h)82.57 mph (132.88 km/h)
80 mph (128.75 km/h)88.07 mph (141.74 km/h)
85 mph (136.79 km/h)93.58 mph (150.6 km/h)
90 mph (144.84 km/h)99.08 mph (159.46 km/h)
95 mph (152.89 km/h)104.59 mph (168.31 km/h)
100 mph (160.93 km/h)110.09 mph (177.17 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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