Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
130/60r21 vs 140/70r21 Tire Comparison Side By Side
  130/60-21 140/70-21 Difference
Diameter inches (mm) 27.14 (689.4) 28.72 (729.4) 1.57 (40) 5.8%
Width inches (mm) 5.12 (130) 5.51 (140) 0.39 (10) 7.7%
Circum. inches (mm) 85.27 (2165.81) 90.22 (2291.48) 4.95 (125.66) 5.8%
Sidewall Height inches (mm) 3.07 (78) 3.86 (98) 0.79 (20) 25.6%
Revolutions per mile (km) 743.07 (461.72) 702.32 (436.4) -40.75 (-25.32) -5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.16 mph (34.05 km/h)
25 mph (40.23 km/h)26.45 mph (42.57 km/h)
30 mph (48.28 km/h)31.74 mph (51.08 km/h)
35 mph (56.33 km/h)37.03 mph (59.6 km/h)
40 mph (64.37 km/h)42.32 mph (68.11 km/h)
45 mph (72.42 km/h)47.61 mph (76.62 km/h)
50 mph (80.47 km/h)52.9 mph (85.14 km/h)
55 mph (88.51 km/h)58.19 mph (93.65 km/h)
60 mph (96.56 km/h)63.48 mph (102.16 km/h)
65 mph (104.61 km/h)68.77 mph (110.68 km/h)
70 mph (112.65 km/h)74.06 mph (119.19 km/h)
75 mph (120.7 km/h)79.35 mph (127.7 km/h)
80 mph (128.75 km/h)84.64 mph (136.22 km/h)
85 mph (136.79 km/h)89.93 mph (144.73 km/h)
90 mph (144.84 km/h)95.22 mph (153.25 km/h)
95 mph (152.89 km/h)100.51 mph (161.76 km/h)
100 mph (160.93 km/h)105.8 mph (170.27 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
17872076223623352441251726012700283729743126324734683711390240234092434346935453
Better Fuel Economy Factory Ratios Increased Power

Most Popular 130/60-R21 Comparisons

To Top