235/55R17 in inches

A 235/55R17 tire is 27.2″ tall and 9.3″ wide, and fits a 17″ wheel. In inches it is written 27.2×9.3R17.

Diameter27.18″

Width9.25″

Sidewall5.09″

Drawn to scale. Nominal dimensions calculated from the size code.

Manufacturer data

How tall 235/55R17 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 19 tires in this size. Their published revolutions per mile work out to 26.3–26.4″ under load (below).

Real 235/55R17 tires measure 27.10–27.20″, against 27.18″ from the size code. They run both taller and shorter than the size code.

Height under load26.3–26.4″

Published revs per mile (764–766) mean the tire rolls like a 26.3–26.4″ tire on the vehicle. Use this for speedometer calibration.

Weight spread23.6–31.2 lb

The lightest (General AltiMAX RT45, SL) is 7.6 lb lighter per corner than the heaviest (BFGoodrich Elite-Force T/A, XL).

19 tires in 235/55R17

Sort by the spec you care about.

	Load					Revs/mi	Source
General AltiMAX RT45Touring	SL · 99T	27.20	23.6	11.0	1,709	764	Spec page
General AltiMAX RT45Touring	SL · 99H	27.20	23.6	11.0	1,709	764	Spec page
General AltiMAX365 AWTouring	SL · 99H	27.20	23.6	11.0	1,709	764	Spec page
Michelin Latitude SportPerformance	SL · 99V	27.20	25.0	8.5	1,554	766	Spec page
Michelin X-Ice SnowWinter	XL · 103H	27.17	25.6	10.5	1,929	766	Spec page
General G-MAX JusticePerformance	SL · 99W	27.20	26.1	10.0	1,709	764	Spec page
Michelin CrossClimate2All-season	SL · 99H	27.10	26.1	10.0	1,709	766	Spec page
Michelin Pilot Sport All-Season 4Performance	XL · 103Y	27.10	26.4	10.0	1,929	766	Spec page
General G-MAX AS07Performance	SL · 99W	27.20	26.5	10.0	1,709	764	Spec page
Michelin Defender2All-season	XL · 103H	27.17	26.7	10.5	1,929	766	Spec page
BFGoodrich g-Force Phenom T/APerformance	XL · 103W	27.17	26.9	9.0	1,929	766	Spec page
Toyo Extensa A/S IIAll-season	SL · 99H	27.16	27.0	11.6	1,709	765	Spec page
Toyo Extensa HP IIPerformance	SL · 99V	27.16	27.4	9.4	1,709	765	Spec page
Toyo Celsius IITouring	XL · 103V	27.16	28.4	11.2	1,929	765	Spec page
General AltiMAX Arctic XWinter	XL · 103T	27.20	28.6	12.0	1,929	764	Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformance	XL · 103W	27.17	28.8	9.0	1,929	766	Spec page
BFGoodrich Advantage ControlAll-season	SL · 99H	27.17	29.3	11.5	1,709	766	Spec page
Toyo Observe G3-IceWinter	XL · 103T	27.16	29.8	12.0	1,929	765	Spec page
BFGoodrich Elite-Force T/AAll-season	XL · 103W	27.17	31.2	10.0	1,929	766	Spec page

Is 235/55R17 a 27-inch tire?

≈27″

Yes. The size code works out to 27.18″, and the 19 tires here publish 27.10–27.20″, so people call it a 27.

All 27-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 235/55R17	Difference
215/55R17	26.31	-0.87″	-3.2%
245/50R17	26.65	-0.53″	-2.0%
225/55R17	26.74	-0.43″	-1.6%
235/60R16	27.10	-0.07″	-0.3%
215/60R17	27.16	-0.02″	-0.1%
235/50R18	27.25	+0.07″	+0.3%
205/70R16	27.30	+0.12″	+0.4%
225/60R17	27.63	+0.45″	+1.7%
345/40R17	27.87	+0.69″	+2.5%
215/65R17	28.00	+0.83″	+3.0%

How to read 235/55R17

How to read any tire size

How 235/55R17 99H is printed on the sidewall. It's the most common code among the 19 tires here (5 of them); tires in this size come in other load and speed ratings too.

1235Section width

235 mm across the widest point, or 9.25 inches. Every 235 size

255Aspect ratio

A percentage, not a measurement: the sidewall is 55% as tall as the tire is wide, which is 129.3 mm or 5.09 inches.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 6.5″ to 8.5″.

599Load index

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

6HSpeed rating

Rated for up to 130 mph sustained.

Specification	Inches	Metric
Overall diameter	27.18	690 mm
Section width	9.25	235 mm
Sidewall height	5.09	129.3 mm
Circumference	85.4	2,169 mm
Revolutions per mile (calculated, unloaded)	742.1	461 per km
Revolutions per mile (published by manufacturers)	764–766	475–476 per km
Approved wheel width	6.5–8.5	165–216 mm

Speedometer error after switching to 235/55R17

Your actual speed– mph

Questions about 235/55R17

What is 235/55R17 in inches?

27.18 inches tall, 9.25 inches wide, on a 17-inch wheel. Written in inches, that is roughly 27.2×9.3R17.

How much does a 235/55R17 tire weigh?

Between 23.6 lb and 31.2 lb for the 19 tires listed here. The lightest is the General AltiMAX RT45 (SL); the heaviest is the BFGoodrich Elite-Force T/A (XL).

What wheel width do I need for 235/55R17?

Manufacturers approve 6.5–8.5″ wide wheels for this size.

How many revolutions per mile does a 235/55R17 make?

Published figures run 764–766 revolutions per mile. The calculated figure is 742.1, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 235/55R17 than 215/60R17?

0.02 inches taller on paper (27.18″ vs 27.16″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.