Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/60r20 vs 255/55r20 Tire Comparison Side By Side
  245/60-20 255/55-20 Difference
Diameter inches (mm) 31.57 (802) 31.04 (788.5) -0.53 (-13.5) -1.7%
Width inches (mm) 9.65 (245) 10.04 (255) 0.39 (10) 4.1%
Circum. inches (mm) 99.2 (2519.56) 97.53 (2477.15) -1.67 (-42.41) -1.7%
Sidewall Height inches (mm) 5.79 (147) 5.52 (140.25) -0.27 (-6.75) -4.6%
Revolutions per mile (km) 638.74 (396.89) 649.68 (403.69) 10.94 (6.8) 1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.66 mph (31.65 km/h)
25 mph (40.23 km/h)24.58 mph (39.56 km/h)
30 mph (48.28 km/h)29.5 mph (47.47 km/h)
35 mph (56.33 km/h)34.41 mph (55.38 km/h)
40 mph (64.37 km/h)39.33 mph (63.29 km/h)
45 mph (72.42 km/h)44.24 mph (71.2 km/h)
50 mph (80.47 km/h)49.16 mph (79.11 km/h)
55 mph (88.51 km/h)54.07 mph (87.02 km/h)
60 mph (96.56 km/h)58.99 mph (94.94 km/h)
65 mph (104.61 km/h)63.91 mph (102.85 km/h)
70 mph (112.65 km/h)68.82 mph (110.76 km/h)
75 mph (120.7 km/h)73.74 mph (118.67 km/h)
80 mph (128.75 km/h)78.65 mph (126.58 km/h)
85 mph (136.79 km/h)83.57 mph (134.49 km/h)
90 mph (144.84 km/h)88.49 mph (142.4 km/h)
95 mph (152.89 km/h)93.4 mph (150.31 km/h)
100 mph (160.93 km/h)98.32 mph (158.23 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
16531921206821602258232924062498262427512892300432083433360937223785401743415044
Better Fuel Economy Factory Ratios Increased Power

Most Popular 245/60-R20 Comparisons

To Top