tireheight.com

245/45R17 in inches

A 245/45R17 tire is 25.7″ tall and 9.6″ wide, and fits a 17″ wheel. In inches it is written 25.7×9.6R17.

Diameter25.68″
Width9.65″
Sidewall4.34″
245/45R17 drawn to scale: 25.68 inch diameter, 4.34 inch sidewall, 17 inch wheel, 9.65 inch tread width17″ wheel4.34″25.68″ overall9.65″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 245/45R17 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 24.9–25.2″ under load (below).

Real 245/45R17 tires measure 25.60–25.98″, against 25.68″ from the size code. They run both taller and shorter than the size code.

  1. Toyo Proxes R1R25.98″ +0.30″
  2. General AltiMAX RT4525.70″ +0.02″
  3. General G-MAX AS0725.70″ +0.02″
  4. General G-MAX RS25.70″ +0.02″
  5. Michelin Pilot Sport 4 S25.70″ +0.02″
  6. Michelin Pilot Sport 525.70″ +0.02″
  7. Michelin Pilot Sport All-Season 425.70″ +0.02″
  8. Toyo Proxes Sport 225.70″ +0.02″
  9. Toyo Proxes Sport A/S · 225.67–25.70″ +0.02″
  10. BFGoodrich g-Force COMP-2 A/S PLUS25.67″ −0.01″
  11. BFGoodrich g-Force Phenom T/A25.67″ −0.01″
  12. Michelin X-Ice Snow25.67″ −0.01″
  13. Toyo Extensa HP II25.67″ −0.01″
  14. Toyo Observe G3-Ice25.67″ −0.01″
  15. Michelin CrossClimate225.60″ −0.08″
Each bar runs from the size code's 25.68″ (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 load24.9–25.2″

Published revs per mile (799–810) mean the tire rolls like a 24.9–25.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread22.0–30.2 lb

The lightest (General AltiMAX RT45, XL) is 8.2 lb lighter per corner than the heaviest (Toyo Proxes Sport A/S, XL).

16 tires in 245/45R17

Sort by the spec you care about.

LoadRevs/miSource
General AltiMAX RT45TouringXL · 99H25.7022.011.01,709809Spec page
Toyo Proxes Sport 2PerformanceXL · 99(Y)25.7023.19.21,709809Spec page
General G-MAX RSPerformanceXL · 99Y25.7023.510.01,709809Spec page
Michelin Pilot Sport 5PerformanceXL · 99(Y)25.7023.59.01,709810Spec page
Michelin Pilot Sport 4 SPerformanceXL · 99(Y)25.7023.89.51,709810Spec page
Toyo Observe G3-IceWinterXL · 99T25.6724.511.31,709809Spec page
General G-MAX AS07PerformanceXL · 99W25.7024.810.01,709809Spec page
Michelin X-Ice SnowWinterXL · 99H25.6725.010.51,709810Spec page
Michelin CrossClimate2All-seasonXL · 99V25.6025.110.01,709810Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 99Y25.7025.410.01,709810Spec page
Toyo Proxes Sport A/SPerformanceXL · 99W25.7025.610.81,709809Spec page
BFGoodrich g-Force Phenom T/APerformanceXL · 99W25.6725.78.01,709810Spec page
Toyo Extensa HP IIPerformanceXL · 99W25.6725.99.61,709809Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformanceXL · 99W25.6727.69.01,709810Spec page
Toyo Proxes R1RPerformanceSL · 95W25.9828.08.21,521799Spec page
Toyo Proxes Sport A/SPerformanceXL · 99V25.6730.210.31,709809Spec page

Is 245/45R17 a 26-inch tire?

≈26″

Yes. The size code works out to 25.68″, and the 16 tires here publish 25.60–25.98″, so people call it a 26.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 245/45R17Difference
235/45R1725.33-0.35″-1.4%
265/40R1725.35-0.33″-1.3%
215/50R1725.46-0.22″-0.8%
275/40R1725.66-0.02″-0.1%
315/35R1725.680.00″0.0%
225/50R1725.86+0.18″+0.7%
205/55R1725.88+0.20″+0.8%
255/45R1726.04+0.35″+1.4%
195/60R1726.21+0.53″+2.1%
335/35R1726.23+0.55″+2.1%

How to read 245/45R17

How to read any tire size

245/45R17 99W as printed on the tire sidewall, with each part numbered245/45R17 99W123456
How 245/45R17 99W 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

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 110.2 mm or 4.34 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 7.5″ to 9.0″.

599Load index

Each tire carries up to 1,709 lb (775 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 1,709 lb each and the standard-load tires up to 1,521 lb, as published.

SpecificationInchesMetric
Overall diameter25.68652 mm
Section width9.65245 mm
Sidewall height4.34110.2 mm
Circumference80.72,049 mm
Revolutions per mile (calculated, unloaded)785.3488 per km
Revolutions per mile (published by manufacturers)799–810496–503 per km
Approved wheel width7.5–9.0191–229 mm

Speedometer error after switching to 245/45R17

Your actual speed– mph

Questions about 245/45R17

What is 245/45R17 in inches?

25.68 inches tall, 9.65 inches wide, on a 17-inch wheel. Written in inches, that is roughly 25.7×9.6R17.

How much does a 245/45R17 tire weigh?

Between 22.0 lb and 30.2 lb for the 16 tires listed here. The lightest is the General AltiMAX RT45 (XL); the heaviest is the Toyo Proxes Sport A/S (XL).

What wheel width do I need for 245/45R17?

Manufacturers approve 7.5–9.0″ wide wheels for this size.

How many revolutions per mile does a 245/45R17 make?

Published figures run 799–810 revolutions per mile. The calculated figure is 785.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 245/45R17 than 275/40R17?

0.02 inches taller on paper (25.68″ vs 25.66″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.