185/65R14 Tire Size in Inches

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

185/65R14
23.5" tall × 7.3" wide
On a 14-inch wheel · roughly 23.5x7.3R14 in flotation sizing
MeasurementInchesMillimetres
Overall diameter23.47596
Section width7.28185
Sidewall height4.73120.2
Wheel diameter14356
Circumference73.71873
Revolutions per mile859 (534 per km)

What 185/65R14 means

185 is the section width in millimetres (7.3 in). 65 is the aspect ratio: the sidewall is 65% as tall as the tire is wide, which works out to 120.2 mm or 4.7 in. R14 is a radial tire for a 14-inch wheel.

Overall diameter is the wheel plus two sidewalls: 14 + 2 × 4.73 = 23.5 inches. These are the nominal dimensions every maker builds to; a real 185/65R14 can measure a few tenths of an inch differently by model and inflation.

Closest equivalent sizes

Common sizes within the usual 3% of 185/65R14's overall diameter. Confirm load index, speed rating and rim width before swapping.

SizeDiameterWidthChangeSpeedometer at 60
205/40R17 new wheels 23.5 in 8.1 in -0.1% really 60.0 mph
195/55R15 new wheels 23.4 in 7.7 in -0.1% really 59.9 mph
205/45R16 new wheels 23.3 in 8.1 in -0.9% really 59.5 mph
195/60R14 23.2 in 7.7 in -1.1% really 59.3 mph
185/60R15 new wheels 23.7 in 7.3 in +1.2% really 60.7 mph
185/55R15 new wheels 23.0 in 7.3 in -1.9% really 58.8 mph

Speedometer if you switch to 195/60R14

Your speedometer stays calibrated for 185/65R14. With a shorter tire you travel slower than it shows.

Speedometer readsTrue speed
30 mph29.7 mph
45 mph44.5 mph
55 mph54.4 mph
65 mph64.3 mph
75 mph74.2 mph
Compare 185/65R14 with any size →

Shop 185/65R14 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 185/65R14 tire is 23.5 inches (596 mm) tall overall. That is the 14-inch wheel plus two sidewalls of 4.7 inches each (65% of the 185 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 185 mm, or 7.3 inches, measured sidewall to sidewall on the recommended rim width. The tread itself is narrower than that. In flotation sizing, 185/65R14 is roughly a 23.5x7.3R14.

205/40R17 is the closest common size, at -0.1% overall diameter (23.5 in against 23.5 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 859 revolutions per mile (534 per kilometre), from its 23.5-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 14-inch sizes

175/65R14 185/60R14 185/70R14 195/60R14 195/70R14 195/75R14 205/70R14 205/75R14 215/75R14