A 205/75R14 tire is about 205 mm wide, roughly 26.1 inches tall, and built for a 14-inch rim — but the load range comes from a separate code on the sidewall.
Three numbers and a letter decide whether a tire fits your vehicle, and the fourth code that decides whether it’s safe is often the one people miss. A 205/75R14 is a common compact-spare and small-trailer size, and reading it wrong can mean a tire that rubs the fender or one rated for less weight than the axle actually carries.
What Each Part of 205/75R14 Means
The 205/75R14 size string breaks into four pieces: nominal width, aspect ratio, construction, and rim diameter. Every number refers to a different measurement.
- 205 — nominal section width of about 205 millimeters, sidewall to sidewall, when mounted and inflated. Measured width varies a bit by tire model and rim.
- 75 — aspect ratio. Sidewall height equals roughly 75% of 205 mm, which works out to about 153.75 mm (6.05 in). It is a calculated figure, not a guaranteed measured height.
- R — radial construction.
- 14 — the wheel diameter in inches. It means a 14-inch rim, not a 14-inch overall tire.
That “14” trips up plenty of shoppers who read it as the tire’s total height. A 205/75R14 stands about 26 inches tall. The rim is what’s 14 inches.
How Tall and Wide Is a 205/75R14 Tire?
A 205/75R14 measures roughly 26.1 inches in unloaded diameter and about 7.8 inches in section width. The math: twice the sidewall height (2 × 6.05 in) plus the 14-inch rim equals about 26.11 inches. Product data for comparable tires lists 26.0–26.1 inches, so the calculation tracks real-world listings.
Circumference lands near 82 inches, with a theoretical 773 revolutions per mile. Real numbers shift with load, inflation, and tread wear — always confirm the individual tire’s published data.
| Sidewall Code | What It Tells You |
|---|---|
| 205 | Nominal width, about 205 mm |
| 75 | Aspect ratio: sidewall is 75% of width (about 6.05 in) |
| R | Radial construction |
| 14 | Fits a 14-inch rim |
| P or ST | P = passenger; ST = special trailer only |
| 95T or 100M | Load index + speed symbol |
| SL / C / D | Load range (separate from the size) |
Where Load Range and Service Description Fit In
Load range is not encoded in “205/75R14.” It appears elsewhere on the sidewall as SL, C, or D, and the full designation carries a service description like 95T. Two 205/75R14 tires can carry very different weight ratings.
In a 95T, 95 is the load index and T is the speed symbol. Trailer tires take an ST prefix — ST205/75R14 — where Load Range C lists about 1,760 lb at 50 psi and Load Range D about 2,040 lb at 65 psi. Ply rating is the older strength label: Load Range C is often marked 6 Ply, D as 8 Ply.
If you’re weighing models, this roundup of tested 205/75R14 tires compares real options.
What to Check Before You Buy
NHTSA says to start with the vehicle’s Tire and Loading Information label, usually on the driver-side door edge or post, plus the owner’s manual. That label gives the correct size and load limits — not the sidewall of a tire you’re replacing.
Replace tires with the original equipment size or one the manufacturer specifically recommends. The agency’s tire safety guidance spells out the label location and replacement advice.
- Match size, load index or range, and speed rating — not just the 205/75R14 string.
- Confirm rim width (a typical range runs 5–7 inches) and fender clearance.
- Read the vehicle’s recommended pressure, not the tire’s maximum.
- Never put ST trailer tires on a car, SUV, or light truck. ST tires are for trailers only.
The prefix matters as much as the numbers. P, no prefix, and ST all change how the tire is built and what it can legally carry.
FAQs
Is 205/75R14 the same as 26 inches?
Close. A 205/75R14 computes to about 26.1 inches in diameter, and listings show 26.0–26.1 inches. The size is nominal, so brand and tread design move the real measured height slightly. Never assume two 205/75R14 tires are identical in diameter.
Can I use an ST205/75R14 on my car?
No. ST stands for Special Trailer, and those tires are engineered only for trailer service. NHTSA’s guidance is to replace tires with the original equipment size or one the vehicle maker recommends. Putting trailer tires on a passenger vehicle is a mismatch you should avoid.
Does the 75 mean the sidewall is 75 mm tall?
No. The 75 is an aspect ratio — sidewall height as a percentage of the 205 mm width. That’s 75% of 205, or about 153.75 mm (6.05 inches). Reading 75 as a millimeter measurement is one of the most common size-decoding mistakes.
References & Sources
- National Highway Traffic Safety Administration. “Tires.” Source for the Tire and Loading Information label location and same-size replacement guidance.