Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/40r20 vs 285/35r20 Tire Comparison Side By Side
  255/40-20 285/35-20 Difference
Diameter inches (mm) 28.03 (712) 27.85 (707.5) -0.18 (-4.5) -0.6%
Width inches (mm) 10.04 (255) 11.22 (285) 1.18 (30) 11.8%
Circum. inches (mm) 88.06 (2236.81) 87.51 (2222.68) -0.56 (-14.14) -0.6%
Sidewall Height inches (mm) 4.02 (102) 3.93 (99.75) -0.09 (-2.25) -2.2%
Revolutions per mile (km) 719.48 (447.06) 724.06 (449.91) 4.58 (2.84) 0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.87 mph (31.98 km/h)
25 mph (40.23 km/h)24.84 mph (39.98 km/h)
30 mph (48.28 km/h)29.81 mph (47.98 km/h)
35 mph (56.33 km/h)34.78 mph (55.97 km/h)
40 mph (64.37 km/h)39.75 mph (63.97 km/h)
45 mph (72.42 km/h)44.72 mph (71.96 km/h)
50 mph (80.47 km/h)49.68 mph (79.96 km/h)
55 mph (88.51 km/h)54.65 mph (87.95 km/h)
60 mph (96.56 km/h)59.62 mph (95.95 km/h)
65 mph (104.61 km/h)64.59 mph (103.95 km/h)
70 mph (112.65 km/h)69.56 mph (111.94 km/h)
75 mph (120.7 km/h)74.53 mph (119.94 km/h)
80 mph (128.75 km/h)79.49 mph (127.93 km/h)
85 mph (136.79 km/h)84.46 mph (135.93 km/h)
90 mph (144.84 km/h)89.43 mph (143.93 km/h)
95 mph (152.89 km/h)94.4 mph (151.92 km/h)
100 mph (160.93 km/h)99.37 mph (159.92 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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