Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/75r15 vs 32/11.5r15 Tire Comparison Side By Side
  315/75-15 32/11.5-15 Difference
Diameter inches (mm) 33.6 (853.5) 32.01 (813.16) -1.59 (-40.34) -4.7%
Width inches (mm) 12.4 (315) 11.5 (292) -0.91 (-23) -7.3%
Circum. inches (mm) 105.56 (2681.35) 100.58 (2554.62) -4.99 (-126.73) -4.7%
Sidewall Height inches (mm) 9.3 (236.25) 8.51 (216.08) -0.79 (-20.17) -8.5%
Revolutions per mile (km) 600.2 (372.95) 629.97 (391.45) 29.78 (18.5) 5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.05 mph (30.67 km/h)
25 mph (40.23 km/h)23.82 mph (38.33 km/h)
30 mph (48.28 km/h)28.58 mph (46 km/h)
35 mph (56.33 km/h)33.35 mph (53.66 km/h)
40 mph (64.37 km/h)38.11 mph (61.33 km/h)
45 mph (72.42 km/h)42.87 mph (69 km/h)
50 mph (80.47 km/h)47.64 mph (76.66 km/h)
55 mph (88.51 km/h)52.4 mph (84.33 km/h)
60 mph (96.56 km/h)57.16 mph (92 km/h)
65 mph (104.61 km/h)61.93 mph (99.66 km/h)
70 mph (112.65 km/h)66.69 mph (107.33 km/h)
75 mph (120.7 km/h)71.46 mph (115 km/h)
80 mph (128.75 km/h)76.22 mph (122.66 km/h)
85 mph (136.79 km/h)80.98 mph (130.33 km/h)
90 mph (144.84 km/h)85.75 mph (138 km/h)
95 mph (152.89 km/h)90.51 mph (145.66 km/h)
100 mph (160.93 km/h)95.27 mph (153.33 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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