265/45R20 in inches

A 265/45R20 tire is 29.4″ tall and 10.4″ wide, and fits a 20″ wheel. In inches it is written 29.4×10.4R20.

Diameter29.39″

Width10.43″

Sidewall4.69″

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

Manufacturer data

How tall 265/45R20 tires really are

Heights published by General, Michelin and Toyo for all 16 tires in this size. Their published revolutions per mile work out to 28.4–28.5″ under load (below).

Real 265/45R20 tires measure 29.30–29.40″, against 29.39″ from the size code. They run both taller and shorter than the size code.

Height under load28.4–28.5″

Published revs per mile (707–709) mean the tire rolls like a 28.4–28.5″ tire on the vehicle. Use this for speedometer calibration.

Weight spread29.9–37.0 lb

The lightest (Michelin Pilot Sport EV, XL) is 7.1 lb lighter per corner than the heaviest (Michelin Pilot Sport All-Season 4, XL).

16 tires in 265/45R20

Sort by the spec you care about.

	Load					Revs/mi	Source
Michelin Pilot Sport EVPerformance	XL · 108Y	29.40	29.9	8.0	2,205	708	Spec page
Michelin Latitude Sport 3Performance	SL · 104Y	29.40	30.1	8.5	1,984	708	Spec page
General G-MAX AS07Performance	XL · 108V	29.40	30.3	11.0	2,205	707	Spec page
Michelin Latitude Tour HPAll-season	SL · 104V	29.30	30.6	9.5	1,804	708	Spec page
Michelin CrossClimate2All-season	XL · 108V	29.30	31.1	10.0	2,205	708	Spec page
Michelin Pilot Sport All-Season 4Performance	XL · 108Y	29.30	31.6	10.0	2,205	709	Spec page
Michelin Primacy Tour A/STouring	XL · 108W	29.40	31.8	9.0	2,205	708	Spec page
Michelin Pilot Sport 4 SUVPerformance	XL · 108Y	29.40	32.0	9.5	2,205	708	Spec page
Toyo Proxes Sport 2Performance	XL · 108Y	29.40	32.4	9.2	2,205	707	Spec page
Michelin X-Ice SnowWinter	XL · 108T	29.37	32.6	10.5	2,205	708	Spec page
Michelin X-Ice Snow+Winter	XL · 108H	29.37	33.0	10.5	2,205	708	Spec page
Toyo Celsius SportPerformance	XL · 108Y	29.37	33.2	9.7	2,205	707	Spec page
Michelin Pilot Alpin 5Winter	XL · 108V	29.37	33.3	10.5	2,205	708	Spec page
Michelin Pilot Alpin 5Winter	SL · 104V	29.37	33.3	10.5	1,984	708	Spec page
Toyo Proxes ST IIIPerformance	XL · 108V	29.37	34.0	10.1	2,205	707	Spec page
Michelin Pilot Sport All-Season 4Performance	XL · 108V	29.40	37.0	9.5	2,205	708	Spec page

Is 265/45R20 a 29-inch tire?

≈29″

Close. The size code works out to 29.39″, and the 16 tires here publish 29.30–29.40″, so people call it a 29.

All 29-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 265/45R20	Difference
245/45R20	28.68	-0.71″	-2.4%
315/35R20	28.68	-0.71″	-2.4%
285/40R20	28.98	-0.41″	-1.4%
255/45R20	29.04	-0.35″	-1.2%
235/50R20	29.25	-0.14″	-0.5%
295/40R20	29.29	-0.10″	-0.3%
305/40R20	29.61	+0.22″	+0.7%
245/50R20	29.65	+0.26″	+0.9%
275/45R20	29.74	+0.35″	+1.2%
255/50R20	30.04	+0.65″	+2.2%

How to read 265/45R20

How to read any tire size

How 265/45R20 108V 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.

1265Section width

265 mm across the widest point, or 10.43 inches. Every 265 size

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 119.3 mm or 4.69 inches.

3RConstruction

Radial construction.

420Wheel diameter

Mounts on a 20-inch wheel. Approved wheel widths run 8.5″ to 10.0″.

5108Load index

Each tire carries up to 2,205 lb (1,000 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 2,205 lb each and the standard-load tires up to 1,984 lb, as published.

Specification	Inches	Metric
Overall diameter	29.39	747 mm
Section width	10.43	265 mm
Sidewall height	4.69	119.3 mm
Circumference	92.3	2,345 mm
Revolutions per mile (calculated, unloaded)	686.2	426 per km
Revolutions per mile (published by manufacturers)	707–709	439–441 per km
Approved wheel width	8.5–10.0	216–254 mm

Speedometer error after switching to 265/45R20

Your actual speed– mph

Questions about 265/45R20

What is 265/45R20 in inches?

29.39 inches tall, 10.43 inches wide, on a 20-inch wheel. Written in inches, that is roughly 29.4×10.4R20.

How much does a 265/45R20 tire weigh?

Between 29.9 lb and 37.0 lb for the 16 tires listed here. The lightest is the Michelin Pilot Sport EV (XL); the heaviest is the Michelin Pilot Sport All-Season 4 (XL).

What wheel width do I need for 265/45R20?

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

How many revolutions per mile does a 265/45R20 make?

Published figures run 707–709 revolutions per mile. The calculated figure is 686.2, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 265/45R20 than 295/40R20?

0.10 inches taller on paper (29.39″ vs 29.29″), which raises the axle about 0.05″. Your speedometer will read about 0.3% slow.