Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/65r17 vs 265/65r20 Tire Comparison Side By Side
  255/65-17 265/65-20 Difference
Diameter inches (mm) 30.05 (763.3) 33.56 (852.5) 3.51 (89.2) 11.7%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 94.41 (2397.98) 105.44 (2678.21) 11.03 (280.23) 11.7%
Sidewall Height inches (mm) 6.53 (165.75) 6.78 (172.25) 0.26 (6.5) 3.9%
Revolutions per mile (km) 671.13 (417.02) 600.9 (373.38) -70.22 (-43.63) -10.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.34 mph (35.95 km/h)
25 mph (40.23 km/h)27.92 mph (44.94 km/h)
30 mph (48.28 km/h)33.51 mph (53.92 km/h)
35 mph (56.33 km/h)39.09 mph (62.91 km/h)
40 mph (64.37 km/h)44.67 mph (71.9 km/h)
45 mph (72.42 km/h)50.26 mph (80.88 km/h)
50 mph (80.47 km/h)55.84 mph (89.87 km/h)
55 mph (88.51 km/h)61.43 mph (98.86 km/h)
60 mph (96.56 km/h)67.01 mph (107.85 km/h)
65 mph (104.61 km/h)72.6 mph (116.83 km/h)
70 mph (112.65 km/h)78.18 mph (125.82 km/h)
75 mph (120.7 km/h)83.76 mph (134.81 km/h)
80 mph (128.75 km/h)89.35 mph (143.79 km/h)
85 mph (136.79 km/h)94.93 mph (152.78 km/h)
90 mph (144.84 km/h)100.52 mph (161.77 km/h)
95 mph (152.89 km/h)106.1 mph (170.75 km/h)
100 mph (160.93 km/h)111.69 mph (179.74 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
15291776191319982089215422252310242725442674277929673175333834423501371640154666
Better Fuel Economy Factory Ratios Increased Power

Most Popular 255/65-R17 Comparisons

To Top