Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/45r17 vs 255/40r17 Tire Comparison Side By Side
  235/45-17 255/40-17 Difference
Diameter inches (mm) 25.33 (643.3) 25.03 (635.8) -0.3 (-7.5) -1.2%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 79.57 (2020.99) 78.64 (1997.42) -0.93 (-23.56) -1.2%
Sidewall Height inches (mm) 4.16 (105.75) 4.02 (102) -0.15 (-3.75) -3.5%
Revolutions per mile (km) 796.32 (494.81) 805.71 (500.64) 9.39 (5.84) 1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.77 mph (31.81 km/h)
25 mph (40.23 km/h)24.71 mph (39.76 km/h)
30 mph (48.28 km/h)29.65 mph (47.72 km/h)
35 mph (56.33 km/h)34.59 mph (55.67 km/h)
40 mph (64.37 km/h)39.53 mph (63.62 km/h)
45 mph (72.42 km/h)44.48 mph (71.58 km/h)
50 mph (80.47 km/h)49.42 mph (79.53 km/h)
55 mph (88.51 km/h)54.36 mph (87.48 km/h)
60 mph (96.56 km/h)59.3 mph (95.44 km/h)
65 mph (104.61 km/h)64.24 mph (103.39 km/h)
70 mph (112.65 km/h)69.18 mph (111.34 km/h)
75 mph (120.7 km/h)74.13 mph (119.29 km/h)
80 mph (128.75 km/h)79.07 mph (127.25 km/h)
85 mph (136.79 km/h)84.01 mph (135.2 km/h)
90 mph (144.84 km/h)88.95 mph (143.15 km/h)
95 mph (152.89 km/h)93.89 mph (151.11 km/h)
100 mph (160.93 km/h)98.83 mph (159.06 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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