Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
115/70r15 vs 115/60r15 Tire Comparison Side By Side
  115/70-15 115/60-15 Difference
Diameter inches (mm) 21.34 (542) 20.43 (519) -0.91 (-23) -4.2%
Width inches (mm) 4.53 (115) 4.53 (115) 0 (0) 0%
Circum. inches (mm) 67.04 (1702.74) 64.19 (1630.49) -2.84 (-72.26) -4.2%
Sidewall Height inches (mm) 3.17 (80.5) 2.72 (69) -0.45 (-11.5) -14.3%
Revolutions per mile (km) 945.15 (587.29) 987.03 (613.31) 41.89 (26.03) 4.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.15 mph (30.82 km/h)
25 mph (40.23 km/h)23.94 mph (38.53 km/h)
30 mph (48.28 km/h)28.73 mph (46.23 km/h)
35 mph (56.33 km/h)33.51 mph (53.94 km/h)
40 mph (64.37 km/h)38.3 mph (61.64 km/h)
45 mph (72.42 km/h)43.09 mph (69.35 km/h)
50 mph (80.47 km/h)47.88 mph (77.05 km/h)
55 mph (88.51 km/h)52.67 mph (84.76 km/h)
60 mph (96.56 km/h)57.45 mph (92.46 km/h)
65 mph (104.61 km/h)62.24 mph (100.17 km/h)
70 mph (112.65 km/h)67.03 mph (107.87 km/h)
75 mph (120.7 km/h)71.82 mph (115.58 km/h)
80 mph (128.75 km/h)76.61 mph (123.28 km/h)
85 mph (136.79 km/h)81.39 mph (130.99 km/h)
90 mph (144.84 km/h)86.18 mph (138.69 km/h)
95 mph (152.89 km/h)90.97 mph (146.4 km/h)
100 mph (160.93 km/h)95.76 mph (154.11 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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