245/50R20 in inches

A 245/50R20 tire is 29.6″ tall and 9.6″ wide, and fits a 20″ wheel. In inches it is written 29.6×9.6R20.

Diameter29.65″

Width9.65″

Sidewall4.82″

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

Manufacturer data

How tall 245/50R20 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 22 tires in this size. Their published revolutions per mile work out to 28.8″ under load (below).

Real 245/50R20 tires measure 29.60–29.70″, against 29.65″ from the size code. Most run taller than the size code (17 of 22).

Height under load28.8″

Published revs per mile (700–701) mean the tire rolls like a 28.8″ tire on the vehicle. Use this for speedometer calibration.

Weight spread26.6–39.6 lb

The lightest (General AltiMAX365 AW, XL) is 13.0 lb lighter per corner than the heaviest (BFGoodrich Trail-Terrain T/A+, SL).

22 tires in 245/50R20

Sort by the spec you care about.

	Load					Revs/mi	Source
General AltiMAX365 AWTouring	XL · 105V	29.60	26.6	11.0	2,039	701	Spec page
General AltiMAX RT45Touring	XL · 105V	29.60	28.6	11.0	2,039	701	Spec page
Michelin Pilot Sport 4 SUVPerformance	SL · 102V	29.70	29.4	9.5	1,874	701	Spec page
General AltiMAX RT45Touring	XL · 105H	29.60	29.7	11.0	2,039	701	Spec page
General AltiMAX Arctic XWinter	XL · 105T	29.60	30.0	–	2,039	701	Spec page
Michelin Primacy LTXAll-season	SL · 102V	29.70	30.4	9.0	1,874	701	Spec page
General Grabber HTS60Touring	SL · 102H	29.60	30.9	12.0	1,874	701	Spec page
Michelin CrossClimate2All-season	XL · 105V	29.70	30.9	10.0	2,039	701	Spec page
Michelin Defender2All-season	XL · 105H	29.69	31.2	10.5	2,039	701	Spec page
Michelin Primacy Tour A/STouring	SL · 102V	29.70	31.3	8.5	1,874	701	Spec page
Michelin Primacy Tour A/STouring	SL · 102V	29.70	31.4	9.0	1,874	701	Spec page
BFGoodrich Advantage ControlAll-season	SL · 102H	29.69	31.5	11.5	1,874	701	Spec page
Toyo Proxes ST IIIPerformance	SL · 102V	29.68	32.3	10.1	1,874	700	Spec page
Michelin X-Ice SnowWinter	XL · 105T	29.69	32.6	10.5	2,039	701	Spec page
Michelin X-Ice Snow+Winter	XL · 105H	29.69	32.7	10.5	2,039	701	Spec page
Toyo Proxes G-Tour	XL · 105V	29.70	33.1	11.8	2,039	700	Spec page
Toyo Celsius IITouring	XL · 105V	29.68	33.1	11.3	2,039	700	Spec page
BFGoodrich Advantage ControlAll-season	SL · 102V	29.69	33.9	10.5	1,874	701	Spec page
Toyo Open Country A/T IIIAll-terrain	XL · 105H	29.68	35.3	13.1	2,039	700	Spec page
Toyo OPEN COUNTRY Q/TAll-season	SL · 102V	29.68	37.0	12.1	1,874	700	Spec page
BFGoodrich Trail-Terrain T/AAll-terrain	SL · 102H	29.70	38.9	12.5	1,874	701	Spec page
BFGoodrich Trail-Terrain T/A+	SL · 102H	29.70	39.6	12.5	1,874	701	Spec page

Is 245/50R20 a 30-inch tire?

≈30″

Yes. The size code works out to 29.65″, and the 22 tires here publish 29.60–29.70″, 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.

Size	Diameter ″	vs 245/50R20	Difference
285/40R20	28.98	-0.67″	-2.3%
255/45R20	29.04	-0.61″	-2.1%
235/50R20	29.25	-0.39″	-1.3%
295/40R20	29.29	-0.35″	-1.2%
265/45R20	29.39	-0.26″	-0.9%
305/40R20	29.61	-0.04″	-0.1%
275/45R20	29.74	+0.10″	+0.3%
255/50R20	30.04	+0.39″	+1.3%
285/45R20	30.10	+0.45″	+1.5%
235/55R20	30.18	+0.53″	+1.8%

How to read 245/50R20

How to read any tire size

How 245/50R20 102V is printed on the sidewall. It's the most common code among the 22 tires here (6 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

250Aspect ratio

A percentage, not a measurement: the sidewall is 50% as tall as the tire is wide, which is 122.5 mm or 4.82 inches.

3RConstruction

Radial construction.

420Wheel diameter

Mounts on a 20-inch wheel. Approved wheel widths run 7.0″ to 8.5″.

5102Load index

Each tire carries up to 1,874 lb (850 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

Specification	Inches	Metric
Overall diameter	29.65	753 mm
Section width	9.65	245 mm
Sidewall height	4.82	122.5 mm
Circumference	93.1	2,366 mm
Revolutions per mile (calculated, unloaded)	680.3	423 per km
Revolutions per mile (published by manufacturers)	700–701	435–436 per km
Approved wheel width	7.0–8.5	178–216 mm

Speedometer error after switching to 245/50R20

Your actual speed– mph

Questions about 245/50R20

What is 245/50R20 in inches?

29.65 inches tall, 9.65 inches wide, on a 20-inch wheel. Written in inches, that is roughly 29.6×9.6R20.

How much does a 245/50R20 tire weigh?

Between 26.6 lb and 39.6 lb for the 22 tires listed here. The lightest is the General AltiMAX365 AW (XL); the heaviest is the BFGoodrich Trail-Terrain T/A+ (SL).

What wheel width do I need for 245/50R20?

Manufacturers approve 7.0–8.5″ wide wheels for this size.

How many revolutions per mile does a 245/50R20 make?

Published figures run 700–701 revolutions per mile. The calculated figure is 680.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 245/50R20 than 305/40R20?

0.04 inches taller on paper (29.65″ vs 29.61″), which raises the axle about 0.02″. Your speedometer will read about 0.1% slow.