tireheight.com

255/40R17 in inches

A 255/40R17 tire is 25.0″ tall and 10.0″ wide, and fits a 17″ wheel. In inches it is written 25.0×10.0R17.

Diameter25.03″
Width10.04″
Sidewall4.02″
255/40R17 drawn to scale: 25.03 inch diameter, 4.02 inch sidewall, 17 inch wheel, 10.04 inch tread width17″ wheel4.02″25.03″ overall10.04″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 255/40R17 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 13 tires in this size. Their published revolutions per mile work out to 24.3–24.4″ under load (below).

Real 255/40R17 tires measure 25.00–25.16″, against 25.03″ from the size code. They run both taller and shorter than the size code.

  1. Toyo Proxes R1R25.16″ +0.13″
  2. BFGoodrich g-Force COMP-2 A/S PLUS25.04″ +0.01″
  3. BFGoodrich g-Force Rival+25.04″ +0.01″
  4. Toyo Proxes R25.04″ +0.01″
  5. Toyo Proxes R888R25.04″ +0.01″
  6. Toyo Proxes RR25.04″ +0.01″
  7. Toyo Proxes Sport A/S25.04″ +0.01″
  8. BFGoodrich g-Force Rival S25.00″ −0.03″
  9. General G-MAX RS25.00″ −0.03″
  10. Michelin Pilot Sport 425.00″ −0.03″
  11. Michelin Pilot Sport All-Season 425.00″ −0.03″
  12. Toyo Proxes RA125.00″ −0.03″
  13. Toyo Proxes Sport R25.00″ −0.03″
Each bar runs from the size code's 25.03″ (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 load24.3–24.4″

Published revs per mile (825–831) mean the tire rolls like a 24.3–24.4″ tire on the vehicle. Use this for speedometer calibration.

Weight spread23.6–26.9 lb

The lightest (General G-MAX RS, SL) is 3.3 lb lighter per corner than the heaviest (BFGoodrich g-Force COMP-2 A/S PLUS, SL).

13 tires in 255/40R17

Sort by the spec you care about.

LoadRevs/miSource
General G-MAX RSPerformanceSL · 94W25.0023.610.01,477830Spec page
Michelin Pilot Sport 4PerformanceXL · 98(Y)25.0023.69.51,653831Spec page
Toyo Proxes RPerformanceSL · 94W25.0423.73.61,477830Spec page
Toyo Proxes RRPerformanceSL25.0423.83.61,477830Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 98Y25.0025.410.01,653831Spec page
Toyo Proxes Sport RPerformanceXL · 98W25.0025.47.21,653830Spec page
Toyo Proxes R888RPerformanceXL · 98W25.0425.86.31,653830Spec page
Toyo Proxes RA1PerformanceSL25.0026.08.01,477828Spec page
Toyo Proxes Sport A/SPerformanceXL · 98W25.0426.39.91,653830Spec page
Toyo Proxes R1RPerformanceSL · 94W25.1626.48.21,477825Spec page
BFGoodrich g-Force Rival SPerformanceSL · 94V25.0026.87.21,477831Spec page
BFGoodrich g-Force Rival+PerformanceSL · 94V25.0426.87.21,477831Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformanceSL · 94W25.0426.99.01,477831Spec page

Is 255/40R17 a 25-inch tire?

≈25″

Yes. The size code works out to 25.03″, and the 13 tires here publish 25.00–25.16″, so people call it a 25.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 255/40R17Difference
235/40R1724.40-0.63″-2.5%
215/45R1724.62-0.41″-1.7%
245/40R1724.72-0.31″-1.3%
225/45R1724.97-0.06″-0.2%
205/50R1725.07+0.04″+0.2%
235/45R1725.33+0.30″+1.2%
265/40R1725.35+0.31″+1.3%
215/50R1725.46+0.43″+1.7%
275/40R1725.66+0.63″+2.5%
245/45R1725.68+0.65″+2.6%

How to read 255/40R17

How to read any tire size

255/40R17 94W as printed on the tire sidewall, with each part numbered255/40R17 94W123456
How 255/40R17 94W is printed on the sidewall. It's the most common code among the 13 tires here (4 of them); tires in this size come in other load and speed ratings too.
1255Section width

255 mm across the widest point, or 10.04 inches. Every 255 size

240Aspect ratio

A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 102.0 mm or 4.02 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 8.5″ to 10.0″.

594Load index

Each tire carries up to 1,477 lb (670 kg) at its maximum pressure.

6WSpeed rating

Rated for up to 168 mph sustained.

SpecificationInchesMetric
Overall diameter25.03636 mm
Section width10.04255 mm
Sidewall height4.02102.0 mm
Circumference78.61,997 mm
Revolutions per mile (calculated, unloaded)805.7501 per km
Revolutions per mile (published by manufacturers)825–831513–516 per km
Approved wheel width8.5–10.0216–254 mm

Speedometer error after switching to 255/40R17

Your actual speed– mph

Questions about 255/40R17

What is 255/40R17 in inches?

25.03 inches tall, 10.04 inches wide, on a 17-inch wheel. Written in inches, that is roughly 25.0×10.0R17.

How much does a 255/40R17 tire weigh?

Between 23.6 lb and 26.9 lb for the 13 tires listed here. The lightest is the General G-MAX RS (SL); the heaviest is the BFGoodrich g-Force COMP-2 A/S PLUS (SL).

What wheel width do I need for 255/40R17?

Manufacturers approve 8.5–10.0″ wide wheels for this size.

How many revolutions per mile does a 255/40R17 make?

Published figures run 825–831 revolutions per mile. The calculated figure is 805.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 255/40R17 than 225/45R17?

0.06 inches taller on paper (25.03″ vs 24.97″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.