Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/40r17 vs 245/40r17 Tire Comparison Side By Side
  255/40-17 245/40-17 Difference
Diameter inches (mm) 25.03 (635.8) 24.72 (627.8) -0.31 (-8) -1.3%
Width inches (mm) 10.04 (255) 9.65 (245) -0.39 (-10) -3.9%
Circum. inches (mm) 78.64 (1997.42) 77.65 (1972.29) -0.99 (-25.13) -1.3%
Sidewall Height inches (mm) 4.02 (102) 3.86 (98) -0.16 (-4) -3.9%
Revolutions per mile (km) 805.71 (500.64) 815.98 (507.02) 10.27 (6.38) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.75 mph (31.78 km/h)
25 mph (40.23 km/h)24.69 mph (39.73 km/h)
30 mph (48.28 km/h)29.62 mph (47.67 km/h)
35 mph (56.33 km/h)34.56 mph (55.62 km/h)
40 mph (64.37 km/h)39.5 mph (63.56 km/h)
45 mph (72.42 km/h)44.43 mph (71.51 km/h)
50 mph (80.47 km/h)49.37 mph (79.45 km/h)
55 mph (88.51 km/h)54.31 mph (87.4 km/h)
60 mph (96.56 km/h)59.25 mph (95.35 km/h)
65 mph (104.61 km/h)64.18 mph (103.29 km/h)
70 mph (112.65 km/h)69.12 mph (111.24 km/h)
75 mph (120.7 km/h)74.06 mph (119.18 km/h)
80 mph (128.75 km/h)78.99 mph (127.13 km/h)
85 mph (136.79 km/h)83.93 mph (135.07 km/h)
90 mph (144.84 km/h)88.87 mph (143.02 km/h)
95 mph (152.89 km/h)93.8 mph (150.96 km/h)
100 mph (160.93 km/h)98.74 mph (158.91 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
20772412259827132836292530223137329634553632377340294312453346744754504554526336
Better Fuel Economy Factory Ratios Increased Power

Most Popular 255/40-R17 Comparisons

To Top