Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
295/30r18 vs 305/35r18 Tire Comparison Side By Side
  295/30-18 305/35-18 Difference
Diameter inches (mm) 24.97 (634.2) 26.41 (670.7) 1.44 (36.5) 5.8%
Width inches (mm) 11.61 (295) 12.01 (305) 0.39 (10) 3.4%
Circum. inches (mm) 78.44 (1992.4) 82.96 (2107.07) 4.51 (114.67) 5.8%
Sidewall Height inches (mm) 3.48 (88.5) 4.2 (106.75) 0.72 (18.25) 20.6%
Revolutions per mile (km) 807.74 (501.91) 763.78 (474.59) -43.96 (-27.31) -5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.15 mph (34.04 km/h)
25 mph (40.23 km/h)26.44 mph (42.55 km/h)
30 mph (48.28 km/h)31.73 mph (51.06 km/h)
35 mph (56.33 km/h)37.01 mph (59.57 km/h)
40 mph (64.37 km/h)42.3 mph (68.08 km/h)
45 mph (72.42 km/h)47.59 mph (76.59 km/h)
50 mph (80.47 km/h)52.88 mph (85.1 km/h)
55 mph (88.51 km/h)58.17 mph (93.61 km/h)
60 mph (96.56 km/h)63.45 mph (102.12 km/h)
65 mph (104.61 km/h)68.74 mph (110.63 km/h)
70 mph (112.65 km/h)74.03 mph (119.14 km/h)
75 mph (120.7 km/h)79.32 mph (127.65 km/h)
80 mph (128.75 km/h)84.6 mph (136.16 km/h)
85 mph (136.79 km/h)89.89 mph (144.67 km/h)
90 mph (144.84 km/h)95.18 mph (153.18 km/h)
95 mph (152.89 km/h)100.47 mph (161.69 km/h)
100 mph (160.93 km/h)105.76 mph (170.2 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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