Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/75r15 vs 235/85r16 Tire Comparison Side By Side
  265/75-15 235/85-16 Difference
Diameter inches (mm) 30.65 (778.5) 31.73 (805.9) 1.08 (27.4) 3.5%
Width inches (mm) 10.43 (265) 9.25 (235) -1.18 (-30) -11.3%
Circum. inches (mm) 96.29 (2445.73) 99.68 (2531.81) 3.39 (86.08) 3.5%
Sidewall Height inches (mm) 7.82 (198.75) 7.86 (199.75) 0.04 (1) 0.5%
Revolutions per mile (km) 658.02 (408.88) 635.65 (394.97) -22.37 (-13.9) -3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.7 mph (33.32 km/h)
25 mph (40.23 km/h)25.88 mph (41.65 km/h)
30 mph (48.28 km/h)31.06 mph (49.98 km/h)
35 mph (56.33 km/h)36.23 mph (58.31 km/h)
40 mph (64.37 km/h)41.41 mph (66.64 km/h)
45 mph (72.42 km/h)46.58 mph (74.97 km/h)
50 mph (80.47 km/h)51.76 mph (83.3 km/h)
55 mph (88.51 km/h)56.94 mph (91.63 km/h)
60 mph (96.56 km/h)62.11 mph (99.96 km/h)
65 mph (104.61 km/h)67.29 mph (108.29 km/h)
70 mph (112.65 km/h)72.46 mph (116.62 km/h)
75 mph (120.7 km/h)77.64 mph (124.95 km/h)
80 mph (128.75 km/h)82.82 mph (133.28 km/h)
85 mph (136.79 km/h)87.99 mph (141.61 km/h)
90 mph (144.84 km/h)93.17 mph (149.94 km/h)
95 mph (152.89 km/h)98.34 mph (158.27 km/h)
100 mph (160.93 km/h)103.52 mph (166.6 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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