Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
33/12.5r15 vs 265/70r17 Tire Comparison Side By Side
  33/12.5-15 265/70-17 Difference
Diameter inches (mm) 33.03 (838.92) 31.61 (802.8) -1.42 (-36.12) -4.3%
Width inches (mm) 12.52 (318) 10.43 (265) -2.09 (-53) -16.7%
Circum. inches (mm) 103.76 (2635.54) 99.29 (2522.07) -4.47 (-113.47) -4.3%
Sidewall Height inches (mm) 9.01 (228.96) 7.3 (185.5) -1.71 (-43.46) -19%
Revolutions per mile (km) 610.63 (379.43) 638.1 (396.5) 27.47 (17.07) 4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.14 mph (30.8 km/h)
25 mph (40.23 km/h)23.92 mph (38.5 km/h)
30 mph (48.28 km/h)28.71 mph (46.2 km/h)
35 mph (56.33 km/h)33.49 mph (53.9 km/h)
40 mph (64.37 km/h)38.28 mph (61.6 km/h)
45 mph (72.42 km/h)43.06 mph (69.3 km/h)
50 mph (80.47 km/h)47.85 mph (77 km/h)
55 mph (88.51 km/h)52.63 mph (84.7 km/h)
60 mph (96.56 km/h)57.42 mph (92.4 km/h)
65 mph (104.61 km/h)62.2 mph (100.1 km/h)
70 mph (112.65 km/h)66.99 mph (107.8 km/h)
75 mph (120.7 km/h)71.77 mph (115.5 km/h)
80 mph (128.75 km/h)76.56 mph (123.2 km/h)
85 mph (136.79 km/h)81.34 mph (130.9 km/h)
90 mph (144.84 km/h)86.13 mph (138.61 km/h)
95 mph (152.89 km/h)90.91 mph (146.31 km/h)
100 mph (160.93 km/h)95.69 mph (154.01 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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