tireheight.com

245/40R17 in inches

A 245/40R17 tire is 24.7″ tall and 9.6″ wide, and fits a 17″ wheel. In inches it is written 24.7×9.6R17.

Diameter24.72″
Width9.65″
Sidewall3.86″
245/40R17 drawn to scale: 24.72 inch diameter, 3.86 inch sidewall, 17 inch wheel, 9.65 inch tread width17″ wheel3.86″24.72″ overall9.65″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 245/40R17 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 16 tires in this size. Their published revolutions per mile work out to 24.0–24.3″ under load (below).

Real 245/40R17 tires measure 24.70–25.10″, against 24.72″ from the size code. They run both taller and shorter than the size code.

  1. Michelin Pilot Sport All-Season 425.10″ +0.38″
  2. Toyo Proxes R1R24.74″ +0.02″
  3. Toyo Observe G3-Ice24.72″ +0.01″
  4. Toyo Proxes R888R24.72″ +0.01″
  5. Toyo Proxes RR24.72″ +0.01″
  6. Toyo Proxes Sport A/S24.72″ +0.01″
  7. BFGoodrich g-Force COMP-2 A/S PLUS24.72″ +0.00″
  8. BFGoodrich g-Force Phenom T/A24.72″ +0.00″
  9. BFGoodrich g-Force Rival S24.72″ +0.00″
  10. BFGoodrich g-Force Rival+24.72″ +0.00″
  11. General G-MAX AS0724.70″ −0.02″
  12. General G-MAX RS24.70″ −0.02″
  13. Michelin Pilot Sport 4 S24.70″ −0.02″
  14. Toyo Proxes R24.70″ −0.02″
  15. Toyo Proxes Sport 224.70″ −0.02″
  16. Toyo Proxes Sport R24.70″ −0.02″
Each bar runs from the size code's 24.72″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.
Height under load24.0–24.3″

Published revs per mile (830–841) mean the tire rolls like a 24.0–24.3″ tire on the vehicle. Use this for speedometer calibration.

Weight spread22.0–30.2 lb

The lightest (General G-MAX RS, SL) is 8.2 lb lighter per corner than the heaviest (Toyo Proxes Sport A/S, XL).

16 tires in 245/40R17

Sort by the spec you care about.

LoadRevs/miSource
General G-MAX RSPerformanceSL · 91W24.7022.010.01,356840Spec page
Toyo Proxes Sport 2PerformanceXL · 95(Y)24.7022.39.21,521840Spec page
Michelin Pilot Sport 4 SPerformanceXL · 95(Y)24.7022.49.51,521841Spec page
Toyo Proxes RRPerformanceSL24.7222.93.61,356840Spec page
Toyo Proxes RPerformanceSL · 91W24.7023.03.71,356840Spec page
General G-MAX AS07PerformanceSL · 91W24.7023.310.01,356840Spec page
Toyo Proxes R1RPerformanceSL · 91W24.7423.58.21,356840Spec page
Toyo Proxes Sport RPerformanceXL · 95W24.7024.07.21,521840Spec page
Toyo Observe G3-IceWinterXL · 95T24.7225.111.31,521840Spec page
Toyo Proxes R888RPerformanceXL · 95W24.7225.16.31,521840Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 95Y25.1025.410.01,521830Spec page
BFGoodrich g-Force Phenom T/APerformanceXL · 95Y24.7225.99.01,521841Spec page
BFGoodrich g-Force Rival SPerformanceSL · 91V24.7225.97.21,356841Spec page
BFGoodrich g-Force Rival+PerformanceSL · 91V24.7225.97.21,356841Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformanceSL · 91W24.7226.39.01,356841Spec page
Toyo Proxes Sport A/SPerformanceXL · 95W24.7230.29.81,521840Spec page

Is 245/40R17 a 25-inch tire?

≈25″

Yes. The size code works out to 24.72″, and the 16 tires here publish 24.70–25.10″, so people call it a 25.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 245/40R17Difference
205/45R1724.26-0.45″-1.8%
235/40R1724.40-0.31″-1.3%
215/45R1724.62-0.10″-0.4%
285/30R1824.73+0.02″+0.1%
225/45R1724.97+0.26″+1.0%
255/40R1725.03+0.31″+1.3%
205/50R1725.07+0.35″+1.4%
235/45R1725.33+0.61″+2.5%
265/40R1725.35+0.63″+2.5%
215/50R1725.46+0.75″+3.0%

How to read 245/40R17

How to read any tire size

245/40R17 91W as printed on the tire sidewall, with each part numbered245/40R17 91W123456
How 245/40R17 91W is printed on the sidewall. It's the most common code among the 16 tires here (5 of them); tires in this size come in other load and speed ratings too.
1245Section width

245 mm across the widest point, or 9.65 inches. Every 245 size

240Aspect ratio

A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 98.0 mm or 3.86 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 8.0″ to 9.5″.

591Load index

Each tire carries up to 1,356 lb (615 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

SpecificationInchesMetric
Overall diameter24.72628 mm
Section width9.65245 mm
Sidewall height3.8698.0 mm
Circumference77.61,972 mm
Revolutions per mile (calculated, unloaded)816.0507 per km
Revolutions per mile (published by manufacturers)830–841516–523 per km
Approved wheel width8.0–9.5203–241 mm

Speedometer error after switching to 245/40R17

Your actual speed– mph

Questions about 245/40R17

What is 245/40R17 in inches?

24.72 inches tall, 9.65 inches wide, on a 17-inch wheel. Written in inches, that is roughly 24.7×9.6R17.

How much does a 245/40R17 tire weigh?

Between 22.0 lb and 30.2 lb for the 16 tires listed here. The lightest is the General G-MAX RS (SL); the heaviest is the Toyo Proxes Sport A/S (XL).

What wheel width do I need for 245/40R17?

Manufacturers approve 8.0–9.5″ wide wheels for this size.

How many revolutions per mile does a 245/40R17 make?

Published figures run 830–841 revolutions per mile. The calculated figure is 816.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 245/40R17 than 215/45R17?

0.10 inches taller on paper (24.72″ vs 24.62″), which raises the axle about 0.05″. Your speedometer will read about 0.4% slow.