Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/85r16 vs 250/50r20 Tire Comparison Side By Side
  235/85-16 250/50-20 Difference
Diameter inches (mm) 31.73 (805.9) 29.84 (758) -1.89 (-47.9) -5.9%
Width inches (mm) 9.25 (235) 9.84 (250) 0.59 (15) 6.4%
Circum. inches (mm) 99.68 (2531.81) 93.75 (2381.33) -5.92 (-150.48) -5.9%
Sidewall Height inches (mm) 7.86 (199.75) 4.92 (125) -2.94 (-74.75) -37.4%
Revolutions per mile (km) 635.65 (394.97) 675.82 (419.93) 40.17 (24.96) 6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.81 mph (30.27 km/h)
25 mph (40.23 km/h)23.51 mph (37.84 km/h)
30 mph (48.28 km/h)28.22 mph (45.41 km/h)
35 mph (56.33 km/h)32.92 mph (52.98 km/h)
40 mph (64.37 km/h)37.62 mph (60.55 km/h)
45 mph (72.42 km/h)42.33 mph (68.12 km/h)
50 mph (80.47 km/h)47.03 mph (75.68 km/h)
55 mph (88.51 km/h)51.73 mph (83.25 km/h)
60 mph (96.56 km/h)56.43 mph (90.82 km/h)
65 mph (104.61 km/h)61.14 mph (98.39 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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