315/75R17 tire size in inches

A 315/75R17 tire measures

35.6" tall × 12.4" wide

9.30" sidewall on a 17" wheel. 566 revolutions per mile.

315/75R17 means a tire 315 mm wide, with sidewalls 75% as tall as the tire is wide (236 mm), radial construction (R), for a 17 inch wheel.

35.6"17" rim9.3"12.4" wide
315/75R17: 35.6 inches tall, 12.4 inches wide, on a 17 inch rim, drawn to scale

315/75R17 specs

Overall diameter (height)35.60 inches (904 mm)
Section width12.40 inches (315 mm)
Sidewall height9.30 inches (236 mm)
Wheel (rim) diameter17 inches
Circumference111.8 inches (2,841 mm)
Revolutions per mile566
Revolutions per kilometer352
Approximate rim width8.5" to 10.0"
In inches (flotation style)35.6x12.4R17
Aspect ratio75%

Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.

Sizes that can replace 315/75R17 on a 17" wheel

These 17" sizes are within 3% of 315/75R17's overall diameter, the range most tire shops treat as interchangeable.

SizeDiameterWidthDifferenceReal speed at 60
305/75R1735.01"12.01"−1.7%59.0 mphCompare
35x12.50R1735.00"12.50"−1.7%59.0 mphCompare

Same height on other wheel sizes (plus and minus sizing)

SizeWheelDiameterDifference
305/65R2020"35.61"0.0%Compare
345/50R2222"35.58"−0.1%Compare
325/65R1919"35.63"+0.1%Compare
315/55R2222"35.64"+0.1%Compare
335/55R2121"35.51"−0.3%Compare
295/85R1616"35.74"+0.4%Compare
355/60R1919"35.77"+0.5%Compare
295/75R1818"35.42"−0.5%Compare
335/60R2020"35.83"+0.6%Compare
355/55R2020"35.37"−0.6%Compare
315/70R1818"35.36"−0.7%Compare
325/60R2020"35.35"−0.7%Compare

One size up or down

Compare 315/75R17 with another size

With 305/75R17 tires, when your speedometer says 60 mph you are really going

59.0 mph

305/75R17 is −0.59 inches (−1.7%) in overall diameter. That is within the 3% most shops and makers allow.

315/75R17305/75R17Difference%
Overall diameter35.60"35.01"−0.59"−1.7%
Section width12.40"12.01"−0.39"−3.2%
Sidewall height9.30"9.01"−0.30"−3.2%
Circumference111.85"109.99"−1.86"−1.7%
Revolutions per mile566.5576.0+9.6+1.7%

Questions

How tall is a 315/75R17 tire?
A 315/75R17 tire is 35.6 inches tall (904 mm), calculated from the size. It is 12.4 inches wide with 9.3 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
What does 315/75R17 mean?
315/75R17 means a tire 315 mm wide, with sidewalls 75% as tall as the tire is wide (236 mm), radial construction (R), for a 17 inch wheel.
How many revolutions per mile does a 315/75R17 tire make?
About 566 revolutions per mile, based on a circumference of 111.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
What rim width fits a 315/75R17 tire?
Roughly 8.5" to 10.0". Check the tire maker's approved rim range for the exact model before buying wheels.
Can I use 305/75R17 instead of 315/75R17?
305/75R17 is −0.59 inches (−1.7%) in overall diameter, so at an indicated 60 mph you would be doing 59.0 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.

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