Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/70r15 vs 245/75r16 Tire Comparison Side By Side
  215/70-15 245/75-16 Difference
Diameter inches (mm) 26.85 (682) 30.47 (773.9) 3.62 (91.9) 13.5%
Width inches (mm) 8.46 (215) 9.65 (245) 1.18 (30) 14%
Circum. inches (mm) 84.35 (2142.57) 95.72 (2431.28) 11.37 (288.71) 13.5%
Sidewall Height inches (mm) 5.93 (150.5) 7.23 (183.75) 1.31 (33.25) 22.1%
Revolutions per mile (km) 751.13 (466.73) 661.93 (411.31) -89.2 (-55.42) -11.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.7 mph (36.52 km/h)
25 mph (40.23 km/h)28.37 mph (45.66 km/h)
30 mph (48.28 km/h)34.04 mph (54.79 km/h)
35 mph (56.33 km/h)39.72 mph (63.92 km/h)
40 mph (64.37 km/h)45.39 mph (73.05 km/h)
45 mph (72.42 km/h)51.06 mph (82.18 km/h)
50 mph (80.47 km/h)56.74 mph (91.31 km/h)
55 mph (88.51 km/h)62.41 mph (100.44 km/h)
60 mph (96.56 km/h)68.09 mph (109.57 km/h)
65 mph (104.61 km/h)73.76 mph (118.7 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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