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255/65R17 in inches

A 255/65R17 tire is 30.1″ tall and 10.0″ wide, and fits a 17″ wheel. In inches it is written 30.1×10.0R17.

Diameter30.05″
Width10.04″
Sidewall6.53″
255/65R17 drawn to scale: 30.05 inch diameter, 6.53 inch sidewall, 17 inch wheel, 10.04 inch tread width17″ wheel6.53″30.05″ overall10.04″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 255/65R17 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 29.2″ under load (below).

Real 255/65R17 tires measure 30.08–30.10″, against 30.05″ from the size code. Every one runs taller than the size code.

Height under load29.2″

Published revs per mile (691) mean the tire rolls like a 29.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread33.2–53.1 lb

The lightest (Michelin X-Ice Snow, SL) is 19.9 lb lighter per corner than the heaviest (BFGoodrich Mud-Terrain T/A KM3, LT D).

13 tires in 255/65R17

Sort by the spec you care about.

LoadRevs/miSource
Michelin X-Ice SnowWinterSL · 110T30.0833.210.52,337691Spec page
Michelin Defender LTX M/S 2All-seasonXL · 114T30.1034.812.52,601691Spec page
BFGoodrich Advantage Control HTHighwaySL · 110T30.0836.012.02,337691Spec page
Toyo Open Country H/T IIHighwaySL · 110T30.0836.211.82,337691Spec page
General Grabber APTAll-terrainSL · 110T30.1036.814.02,337691Spec page
General Grabber H/THighwaySL · 110T30.1036.812.02,337691Spec page
Toyo Observe G3-IceWinterXL · 114T30.0837.013.12,601691Spec page
BFGoodrich Trail-Terrain T/AAll-terrainSL · 110T30.1038.912.52,337691Spec page
BFGoodrich Trail-Terrain T/A+SL · 110T30.1039.712.52,337691Spec page
General Grabber A/TXAll-terrainSL · 110T30.1041.014.02,337691Spec page
Toyo Open Country A/T IIIAll-terrainLT D · 114/110S30.0845.016.32,600691Spec page
BFGoodrich All-Terrain T/A KO3All-terrainLT D · 114S30.1049.715.02,600691Spec page
BFGoodrich Mud-Terrain T/A KM3Mud-terrainLT D · 114Q30.1053.118.02,600691Spec page

Is 255/65R17 a 30-inch tire?

≈30″

Yes. The size code works out to 30.05″, and the 13 tires here publish 30.08–30.10″, so people call it a 30.

All 30-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 255/65R17Difference
265/60R1729.52-0.53″-1.8%
245/65R1729.54-0.51″-1.7%
235/70R1729.95-0.10″-0.3%
275/60R1729.99-0.06″-0.2%
235/65R1830.03-0.02″-0.1%
255/60R1830.05-0.00″-0.0%
255/70R1630.06+0.00″+0.0%
225/75R1730.29+0.24″+0.8%
245/70R1730.50+0.45″+1.5%
265/65R1730.56+0.51″+1.7%

How to read 255/65R17

How to read any tire size

255/65R17 110T as printed on the tire sidewall, with each part numbered255/65R17 110T123456
How 255/65R17 110T is printed on the sidewall. It's the most common code among the 13 tires here (8 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

265Aspect ratio

A percentage, not a measurement: the sidewall is 65% as tall as the tire is wide, which is 165.8 mm or 6.53 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 7.0″ to 9.0″.

5110Load index

Each tire carries up to 2,337 lb (1,060 kg) at its maximum pressure.

6TSpeed rating

Rated for up to 118 mph sustained.

SpecificationInchesMetric
Overall diameter30.05763 mm
Section width10.04255 mm
Sidewall height6.53165.8 mm
Circumference94.42,398 mm
Revolutions per mile (calculated, unloaded)671.1417 per km
Revolutions per mile (published by manufacturers)691429 per km
Approved wheel width7.0–9.0178–229 mm

Speedometer error after switching to 255/65R17

Your actual speed– mph

Questions about 255/65R17

What is 255/65R17 in inches?

30.05 inches tall, 10.04 inches wide, on a 17-inch wheel. Written in inches, that is roughly 30.1×10.0R17.

How much does a 255/65R17 tire weigh?

Between 33.2 lb and 53.1 lb for the 13 tires listed here. The lightest is the Michelin X-Ice Snow (SL); the heaviest is the BFGoodrich Mud-Terrain T/A KM3 (LT D).

What wheel width do I need for 255/65R17?

Manufacturers approve 7.0–9.0″ wide wheels for this size.

How many revolutions per mile does a 255/65R17 make?

Published figures run 691 revolutions per mile. The calculated figure is 671.1, but manufacturers measure the tire under load, where it rolls on a smaller radius.

What is the difference between P255/65R17 and LT255/65R17?

Passenger tires (10 here) are built for passenger loads, with max loads of 2337–2601 lb. Light-truck tires (3 here) come in heavier load ranges with max loads of 2600 lb, and are usually heavier with deeper tread.

How much taller is 255/65R17 than 275/60R17?

0.06 inches taller on paper (30.05″ vs 29.99″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.