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265/40R17 in inches

A 265/40R17 tire is 25.3″ tall and 10.4″ wide, and fits a 17″ wheel. In inches it is written 25.3×10.4R17.

Diameter25.35″
Width10.43″
Sidewall4.17″
265/40R17 drawn to scale: 25.35 inch diameter, 4.17 inch sidewall, 17 inch wheel, 10.43 inch tread width17″ wheel4.17″25.35″ overall10.43″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 265/40R17 tires really are

Heights published by Michelin for the one tire in this size. Their published revolutions per mile work out to 24.6″ under load (below).

The one tire listed, the Michelin Pilot Sport 4 S, measures 25.40″: 0.05″ taller than the size code's 25.35″.

Height under load24.6″

Published revs per mile (821) mean the tire rolls like a 24.6″ tire on the vehicle. Use this for speedometer calibration.

1 tire in 265/40R17

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Sport 4 SPerformanceXL · 100(Y)25.4024.49.51,764821Spec page

Is 265/40R17 a 25-inch tire?

≈25″

Close. The size code works out to 25.35″, and the 1 tire here publishes 25.40″, so people call it a 25.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 265/40R17Difference
225/45R1724.97-0.37″-1.5%
255/40R1725.03-0.31″-1.2%
205/50R1725.07-0.28″-1.1%
235/45R1725.33-0.02″-0.1%
215/50R1725.46+0.12″+0.5%
275/40R1725.66+0.31″+1.2%
245/45R1725.68+0.33″+1.3%
315/35R1725.68+0.33″+1.3%
225/50R1725.86+0.51″+2.0%
205/55R1725.88+0.53″+2.1%

How to read 265/40R17

How to read any tire size

265/40R17 100Y as printed on the tire sidewall, with each part numbered265/40R17 100Y123456
How 265/40R17 100Y is printed on the sidewall. It's the most common code among the 1 tire here; tires in this size come in other load and speed ratings too.
1265Section width

265 mm across the widest point, or 10.43 inches. Every 265 size

240Aspect ratio

A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 106.0 mm or 4.17 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 9.0″ to 10.5″.

5100Load index

Each tire carries up to 1,764 lb (800 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size.

SpecificationInchesMetric
Overall diameter25.35644 mm
Section width10.43265 mm
Sidewall height4.17106.0 mm
Circumference79.62,023 mm
Revolutions per mile (calculated, unloaded)795.7494 per km
Revolutions per mile (published by manufacturers)821510 per km
Approved wheel width9.0–10.5229–267 mm

Speedometer error after switching to 265/40R17

Your actual speed– mph

Questions about 265/40R17

What is 265/40R17 in inches?

25.35 inches tall, 10.43 inches wide, on a 17-inch wheel. Written in inches, that is roughly 25.3×10.4R17.

What wheel width do I need for 265/40R17?

Manufacturers approve 9.0–10.5″ wide wheels for this size.

How many revolutions per mile does a 265/40R17 make?

Published figures run 821 revolutions per mile. The calculated figure is 795.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 265/40R17 than 235/45R17?

0.02 inches taller on paper (25.35″ vs 25.33″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.