Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/40r18 vs 245/40r19 Tire Comparison Side By Side
  245/40-18 245/40-19 Difference
Diameter inches (mm) 25.72 (653.2) 26.72 (678.6) 1 (25.4) 3.9%
Width inches (mm) 9.65 (245) 9.65 (245) 0 (0) 0%
Circum. inches (mm) 80.79 (2052.09) 83.93 (2131.88) 3.14 (79.8) 3.9%
Sidewall Height inches (mm) 3.86 (98) 3.86 (98) 0 (0) 0%
Revolutions per mile (km) 784.25 (487.31) 754.89 (469.07) -29.35 (-18.24) -3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.78 mph (33.44 km/h)
25 mph (40.23 km/h)25.97 mph (41.8 km/h)
30 mph (48.28 km/h)31.17 mph (50.16 km/h)
35 mph (56.33 km/h)36.36 mph (58.52 km/h)
40 mph (64.37 km/h)41.56 mph (66.88 km/h)
45 mph (72.42 km/h)46.75 mph (75.24 km/h)
50 mph (80.47 km/h)51.94 mph (83.6 km/h)
55 mph (88.51 km/h)57.14 mph (91.96 km/h)
60 mph (96.56 km/h)62.33 mph (100.32 km/h)
65 mph (104.61 km/h)67.53 mph (108.68 km/h)
70 mph (112.65 km/h)72.72 mph (117.03 km/h)
75 mph (120.7 km/h)77.92 mph (125.39 km/h)
80 mph (128.75 km/h)83.11 mph (133.75 km/h)
85 mph (136.79 km/h)88.31 mph (142.11 km/h)
90 mph (144.84 km/h)93.5 mph (150.47 km/h)
95 mph (152.89 km/h)98.69 mph (158.83 km/h)
100 mph (160.93 km/h)103.89 mph (167.19 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
19212232240325102624270627962902304931963360349137283989419443244398466850445861
Better Fuel Economy Factory Ratios Increased Power

Most Popular 245/40-R18 Comparisons

To Top