305/45R22 in inches

A 305/45R22 tire is 32.8″ tall and 12.0″ wide, and fits a 22″ wheel. In inches it is written 32.8×12.0R22.

Diameter32.81″

Width12.01″

Sidewall5.40″

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

Manufacturer data

How tall 305/45R22 tires really are

Heights published by BFGoodrich, General, Michelin, Mickey Thompson and Toyo for all 9 tires in this size. Their published revolutions per mile work out to 31.8–31.9″ under load (below).

Real 305/45R22 tires measure 32.80–33.00″, against 32.81″ from the size code. They run both taller and shorter than the size code.

Mickey Thompson Baja Boss A/T33.00″ +0.19″
BFGoodrich All-Terrain T/A KO332.80″ −0.01″
General G-MAX AS0732.80″ −0.01″
General Grabber A/TX32.80″ −0.01″
Michelin Defender LTX M/S 232.80″ −0.01″
Michelin Pilot Sport S 532.80″ −0.01″
Toyo Open Country R/T Trail32.80″ −0.01″
Toyo Open Country A/T III32.80″ −0.01″
Toyo Proxes ST III32.80″ −0.01″

Each bar runs from the size code's 32.81″ (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 load31.8–31.9″

Published revs per mile (633–634) mean the tire rolls like a 31.8–31.9″ tire on the vehicle. Use this for speedometer calibration.

Weight spread35.6–60.4 lb

The lightest (Michelin Pilot Sport S 5, XL) is 24.8 lb lighter per corner than the heaviest (BFGoodrich All-Terrain T/A KO3, LT E).

9 tires in 305/45R22

Sort by the spec you care about.

	Load					Revs/mi	Source
Michelin Pilot Sport S 5Performance	XL · 118V	32.80	35.6	8.0	2,910	634	Spec page
General G-MAX AS07Performance	XL · 118V	32.80	41.1	11.0	2,910	633	Spec page
Michelin Defender LTX M/S 2All-season	XL · 118H	32.80	41.1	11.0	2,910	634	Spec page
Toyo Proxes ST IIIPerformance	XL · 118V	32.80	45.6	10.1	2,910	633	Spec page
General Grabber A/TXAll-terrain	XL · 118T	32.80	46.5	14.0	2,910	633	Spec page
Toyo Open Country R/T TrailRugged-terrain	XL · 118T	32.80	46.9	13.9	2,910	633	Spec page
Toyo Open Country A/T IIIAll-terrain	XL · 118S	32.80	47.6	13.9	2,910	633	Spec page
Mickey Thompson Baja Boss A/TAll-terrain	XL · 118T	33.00	52.0	16.0	2,910	–	Spec page
BFGoodrich All-Terrain T/A KO3All-terrain	LT E · 115S	32.80	60.4	15.0	2,680	634	Spec page

Is 305/45R22 a 33-inch tire?

≈33″

Yes. The size code works out to 32.81″, and the 9 tires here publish 32.80–33.00″, so people call it a 33.

All 33-inch tire sizes, on every wheel size.

A true 33×12.50R22 is 0.19″ taller on paper and 0.5″ wider.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

Size	Diameter ″	vs 305/45R22	Difference
285/45R22	32.10	-0.71″	-2.2%
325/40R22	32.24	-0.57″	-1.7%
265/50R22	32.43	-0.37″	-1.1%
305/40R23	32.61	-0.20″	-0.6%
275/50R22	32.83	+0.02″	+0.1%
275/55R21	32.91	+0.10″	+0.3%
33×12.50R22	33.00	+0.19″	+0.6%
355/40R22	33.18	+0.37″	+1.1%
285/50R22	33.22	+0.41″	+1.3%
295/50R22	33.61	+0.81″	+2.5%

How to read 305/45R22

How to read any tire size

How 305/45R22 118V is printed on the sidewall. It's the most common code among the 9 tires here (3 of them); tires in this size come in other load and speed ratings too.

1305Section width

305 mm across the widest point, or 12.01 inches. Every 305 size

245Aspect ratio

A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 137.3 mm or 5.40 inches.

3RConstruction

Radial construction.

422Wheel diameter

Mounts on a 22-inch wheel. Approved wheel widths run 9.5″ to 11.5″.

5118Load index

Each tire carries up to 2,910 lb (1,320 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

XLExtra load

Printed after the size.

Specification	Inches	Metric
Overall diameter	32.81	833 mm
Section width	12.01	305 mm
Sidewall height	5.40	137.3 mm
Circumference	103.1	2,618 mm
Revolutions per mile (calculated, unloaded)	614.7	382 per km
Revolutions per mile (published by manufacturers)	633–634	393–394 per km
Approved wheel width	9.5–11.5	241–292 mm

Speedometer error after switching to 305/45R22

Your actual speed– mph

Questions about 305/45R22

What is 305/45R22 in inches?

32.81 inches tall, 12.01 inches wide, on a 22-inch wheel. Written in inches, that is roughly 32.8×12.0R22.

How much does a 305/45R22 tire weigh?

Between 35.6 lb and 60.4 lb for the 9 tires listed here. The lightest is the Michelin Pilot Sport S 5 (XL); the heaviest is the BFGoodrich All-Terrain T/A KO3 (LT E).

What wheel width do I need for 305/45R22?

Manufacturers approve 9.5–11.5″ wide wheels for this size.

How many revolutions per mile does a 305/45R22 make?

Published figures run 633–634 revolutions per mile. The calculated figure is 614.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.

What is the difference between P305/45R22 and LT305/45R22?

Passenger tires (8 here) are built for passenger loads, with max loads of 2910 lb. Light-truck tires (1 here) come in heavier load ranges with max loads of 2680 lb, and are usually heavier with deeper tread.

How much taller is 305/45R22 than 265/50R22?

0.37 inches taller on paper (32.81″ vs 32.43″), which raises the axle about 0.19″. Your speedometer will read about 1.2% slow.