Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
31/10r15 vs 265/70r15 Tire Comparison Side By Side
  31/10-15 265/70-15 Difference
Diameter inches (mm) 31 (787.4) 29.61 (752) -1.39 (-35.4) -4.5%
Width inches (mm) 10 (254) 10.43 (265) 0.43 (11) 4.3%
Circum. inches (mm) 97.39 (2473.69) 93.01 (2362.48) -4.38 (-111.21) -4.5%
Sidewall Height inches (mm) 8 (203.2) 7.3 (185.5) -0.7 (-17.7) -8.7%
Revolutions per mile (km) 650.58 (404.25) 681.21 (423.28) 30.63 (19.03) 4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.1 mph (30.74 km/h)
25 mph (40.23 km/h)23.88 mph (38.42 km/h)
30 mph (48.28 km/h)28.65 mph (46.11 km/h)
35 mph (56.33 km/h)33.43 mph (53.79 km/h)
40 mph (64.37 km/h)38.2 mph (61.48 km/h)
45 mph (72.42 km/h)42.98 mph (69.16 km/h)
50 mph (80.47 km/h)47.75 mph (76.85 km/h)
55 mph (88.51 km/h)52.53 mph (84.53 km/h)
60 mph (96.56 km/h)57.3 mph (92.22 km/h)
65 mph (104.61 km/h)62.08 mph (99.9 km/h)
70 mph (112.65 km/h)66.85 mph (107.59 km/h)
75 mph (120.7 km/h)71.63 mph (115.27 km/h)
80 mph (128.75 km/h)76.4 mph (122.96 km/h)
85 mph (136.79 km/h)81.18 mph (130.64 km/h)
90 mph (144.84 km/h)85.95 mph (138.33 km/h)
95 mph (152.89 km/h)90.73 mph (146.01 km/h)
100 mph (160.93 km/h)95.5 mph (153.7 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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