Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/65r17 vs 265/70r17 Tire Comparison Side By Side
  245/65-17 265/70-17 Difference
Diameter inches (mm) 29.54 (750.3) 31.61 (802.8) 2.07 (52.5) 7%
Width inches (mm) 9.65 (245) 10.43 (265) 0.79 (20) 8.2%
Circum. inches (mm) 92.8 (2357.14) 99.29 (2522.07) 6.49 (164.93) 7%
Sidewall Height inches (mm) 6.27 (159.25) 7.3 (185.5) 1.03 (26.25) 16.5%
Revolutions per mile (km) 682.75 (424.24) 638.1 (396.5) -44.65 (-27.74) -6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.4 mph (34.44 km/h)
25 mph (40.23 km/h)26.75 mph (43.05 km/h)
30 mph (48.28 km/h)32.1 mph (51.66 km/h)
35 mph (56.33 km/h)37.45 mph (60.27 km/h)
40 mph (64.37 km/h)42.8 mph (68.88 km/h)
45 mph (72.42 km/h)48.15 mph (77.49 km/h)
50 mph (80.47 km/h)53.5 mph (86.1 km/h)
55 mph (88.51 km/h)58.85 mph (94.71 km/h)
60 mph (96.56 km/h)64.2 mph (103.32 km/h)
65 mph (104.61 km/h)69.55 mph (111.93 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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