225/75R16 Tire Size in Inches

Diameter, width, sidewall and the closest equivalent sizes, computed from the size code.

225/75R16
29.3" tall × 8.9" wide
On a 16-inch wheel · roughly 29.3x8.9R16 in flotation sizing
MeasurementInchesMillimetres
Overall diameter29.29744
Section width8.86225
Sidewall height6.64168.8
Wheel diameter16406
Circumference92.02337
Revolutions per mile689 (428 per km)

What 225/75R16 means

225 is the section width in millimetres (8.9 in). 75 is the aspect ratio: the sidewall is 75% as tall as the tire is wide, which works out to 168.8 mm or 6.6 in. R16 is a radial tire for a 16-inch wheel.

Overall diameter is the wheel plus two sidewalls: 16 + 2 × 6.64 = 29.3 inches. These are the nominal dimensions every maker builds to; a real 225/75R16 can measure a few tenths of an inch differently by model and inflation.

Closest equivalent sizes

Common sizes within the usual 3% of 225/75R16's overall diameter. Confirm load index, speed rating and rim width before swapping.

SizeDiameterWidthChangeSpeedometer at 60
265/35R22 new wheels 29.3 in 10.4 in +0.1% really 60.0 mph
265/40R21 new wheels 29.3 in 10.4 in +0.2% really 60.1 mph
265/45R20 new wheels 29.4 in 10.4 in +0.3% really 60.2 mph
235/55R19 new wheels 29.2 in 9.3 in -0.4% really 59.8 mph
265/50R19 new wheels 29.4 in 10.4 in +0.5% really 60.3 mph
295/35R21 new wheels 29.1 in 11.6 in -0.5% really 59.7 mph

Speedometer if you switch to 265/35R22

Your speedometer stays calibrated for 225/75R16. With a taller tire you travel faster than it shows.

Speedometer readsTrue speed
30 mph30.0 mph
45 mph45.0 mph
55 mph55.0 mph
65 mph65.0 mph
75 mph75.0 mph
Compare 225/75R16 with any size →

Shop 225/75R16 tires

Check the load index and speed rating on your door-jamb placard before you buy, especially for LT tires used for towing.

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Frequently Asked Questions

A 225/75R16 tire is 29.3 inches (744 mm) tall overall. That is the 16-inch wheel plus two sidewalls of 6.6 inches each (75% of the 225 mm section width). Expect a real tire to measure within a few tenths of an inch of this, depending on the model and inflation.

The section width is 225 mm, or 8.9 inches, measured sidewall to sidewall on the recommended rim width. The tread itself is narrower than that. In flotation sizing, 225/75R16 is roughly a 29.3x8.9R16.

265/35R22 is the closest common size, at +0.1% overall diameter (29.3 in against 29.3 in). Most makers treat about 3% as the limit for a swap without speedometer or clearance problems, but always confirm load index, speed rating and wheel width before changing size.

About 689 revolutions per mile (428 per kilometre), from its 29.3-inch rolling diameter. Real-world figures run slightly higher because a loaded tire squats. This number is what your speedometer and odometer are calibrated against.

Last updated: October 2, 2026

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Other 16-inch sizes

195/55R16 195/60R16 195/65R16 205/50R16 205/55R16 205/60R16 205/65R16 215/55R16 215/60R16 215/65R16 215/70R16 215/85R16 225/50R16 225/55R16 225/60R16 225/65R16 225/70R16 235/60R16 235/65R16 235/70R16 235/75R16 235/85R16 245/70R16 245/75R16 255/65R16 255/70R16 265/70R16 265/75R16 285/75R16 205/45R16 255/85R16 275/70R16 305/70R16 315/75R16