Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/30r24 vs 305/35r24 Tire Comparison Side By Side
  255/30-24 305/35-24 Difference
Diameter inches (mm) 30.02 (762.6) 32.41 (823.1) 2.38 (60.5) 7.9%
Width inches (mm) 10.04 (255) 12.01 (305) 1.97 (50) 19.6%
Circum. inches (mm) 94.32 (2395.78) 101.8 (2585.84) 7.48 (190.07) 7.9%
Sidewall Height inches (mm) 3.01 (76.5) 4.2 (106.75) 1.19 (30.25) 39.5%
Revolutions per mile (km) 671.74 (417.4) 622.37 (386.72) -49.37 (-30.68) -7.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.59 mph (34.74 km/h)
25 mph (40.23 km/h)26.98 mph (43.43 km/h)
30 mph (48.28 km/h)32.38 mph (52.11 km/h)
35 mph (56.33 km/h)37.78 mph (60.8 km/h)
40 mph (64.37 km/h)43.17 mph (69.48 km/h)
45 mph (72.42 km/h)48.57 mph (78.17 km/h)
50 mph (80.47 km/h)53.97 mph (86.85 km/h)
55 mph (88.51 km/h)59.36 mph (95.54 km/h)
60 mph (96.56 km/h)64.76 mph (104.22 km/h)
65 mph (104.61 km/h)70.16 mph (112.91 km/h)
70 mph (112.65 km/h)75.55 mph (121.59 km/h)
75 mph (120.7 km/h)80.95 mph (130.28 km/h)
80 mph (128.75 km/h)86.35 mph (138.96 km/h)
85 mph (136.79 km/h)91.74 mph (147.65 km/h)
90 mph (144.84 km/h)97.14 mph (156.33 km/h)
95 mph (152.89 km/h)102.54 mph (165.02 km/h)
100 mph (160.93 km/h)107.93 mph (173.7 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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