305 Tire Size in Inches
A 305 tire is 12.01 inches wide (305 mm ÷ 25.4). Its overall height depends on the aspect ratio and wheel size — the chart below works out every common combination.
Calculated from the size designation · Updated 2026-11-05 · By CarWhere Research
305 tire overall height (inches)
| Aspect | R15 | R16 | R17 | R18 | R19 | R20 | R21 | R22 |
|---|---|---|---|---|---|---|---|---|
| 305/35 | 23.4 | 24.4 | 25.4 | 26.4 | 27.4 | 28.4 | 29.4 | 30.4 |
| 305/40 | 24.6 | 25.6 | 26.6 | 27.6 | 28.6 | 29.6 | 30.6 | 31.6 |
| 305/45 | 25.8 | 26.8 | 27.8 | 28.8 | 29.8 | 30.8 | 31.8 | 32.8 |
| 305/50 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 |
| 305/55 | 28.2 | 29.2 | 30.2 | 31.2 | 32.2 | 33.2 | 34.2 | 35.2 |
| 305/60 | 29.4 | 30.4 | 31.4 | 32.4 | 33.4 | 34.4 | 35.4 | 36.4 |
| 305/65 | 30.6 | 31.6 | 32.6 | 33.6 | 34.6 | 35.6 | 36.6 | 37.6 |
| 305/70 | 31.8 | 32.8 | 33.8 | 34.8 | 35.8 | 36.8 | 37.8 | 38.8 |
| 305/75 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 |
Calculated nominal dimensions. Actual measured size varies by tire model and rim width. Linked values are factory sizes on vehicles in our data.
Other widths
Check the exact vehicle, not just the model
Trim, package and production changes all move these numbers. Decode the 17-character VIN with the free VIN decoder to confirm the engine and trim, or see the federal engine and MPG specs. Shopping? Browse live inventory and what buyers actually paid.
Frequently asked questions
How wide is a 305 tire in inches?
305 mm ÷ 25.4 = 12.01 inches of section width. The tread itself is somewhat narrower than the section width.
How tall is a 305 tire?
It depends on the aspect ratio and wheel size. For example 305/70R17 is about 33.8 in tall and 305/55R20 about 33.2 in — see the chart.