Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/35r23 vs 345/25r24 Tire Comparison Side By Side
  305/35-23 345/25-24 Difference
Diameter inches (mm) 31.41 (797.7) 30.79 (782.1) -0.61 (-15.6) -2%
Width inches (mm) 12.01 (305) 13.58 (345) 1.57 (40) 13.1%
Circum. inches (mm) 98.66 (2506.05) 96.73 (2457.04) -1.93 (-49.01) -2%
Sidewall Height inches (mm) 4.2 (106.75) 3.4 (86.25) -0.81 (-20.5) -19.2%
Revolutions per mile (km) 642.18 (399.03) 654.99 (406.99) 12.81 (7.96) 2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.61 mph (31.56 km/h)
25 mph (40.23 km/h)24.51 mph (39.45 km/h)
30 mph (48.28 km/h)29.41 mph (47.34 km/h)
35 mph (56.33 km/h)34.32 mph (55.23 km/h)
40 mph (64.37 km/h)39.22 mph (63.11 km/h)
45 mph (72.42 km/h)44.12 mph (71 km/h)
50 mph (80.47 km/h)49.02 mph (78.89 km/h)
55 mph (88.51 km/h)53.92 mph (86.78 km/h)
60 mph (96.56 km/h)58.83 mph (94.67 km/h)
65 mph (104.61 km/h)63.73 mph (102.56 km/h)
70 mph (112.65 km/h)68.63 mph (110.45 km/h)
75 mph (120.7 km/h)73.53 mph (118.34 km/h)
80 mph (128.75 km/h)78.44 mph (126.23 km/h)
85 mph (136.79 km/h)83.34 mph (134.12 km/h)
90 mph (144.84 km/h)88.24 mph (142.01 km/h)
95 mph (152.89 km/h)93.14 mph (149.9 km/h)
100 mph (160.93 km/h)98.04 mph (157.79 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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