Tire sizes
What size is a 34-inch tire?
These common sizes all measure between 33.5 and 34.5 inches tall, so they get called 34s. Pick one for its exact dimensions.
| Size | Height | Width | Wheel |
|---|---|---|---|
| 305/70R17 | 33.8 in | 12.0 in | 17 in |
| 285/75R17 | 33.8 in | 11.2 in | 17 in |
| 315/70R17 | 34.4 in | 12.4 in | 17 in |
| 305/65R18 | 33.6 in | 12.0 in | 18 in |
| 285/70R18 | 33.7 in | 11.2 in | 18 in |
| 295/70R18 | 34.3 in | 11.6 in | 18 in |
| 315/55R20 | 33.6 in | 12.4 in | 20 in |
| 295/60R20 | 33.9 in | 11.6 in | 20 in |
| 275/65R20 | 34.1 in | 10.8 in | 20 in |
| 305/60R20 | 34.4 in | 12.0 in | 20 in |
Questions
What size is a 34-inch tire in metric?
Metric sizes that measure between 33.5 and 34.5 inches tall include 305/70R17, 285/75R17, 315/70R17, 305/65R18, 285/70R18, 295/70R18, 315/55R20, 295/60R20, 275/65R20, 305/60R20.
Is a 34-inch tire exactly 34 inches tall?
Not always. '34s' is a class: metric sizes from about 33.5 to 34.5 inches get called 34s, and inch-sized tires often measure a little under their label once mounted.
What gear ratio do I need for 34-inch tires?
From a 31.5-inch stock tire, 3.73 gears need about 4.03 and 4.10 gears about 4.43 to drive the same on 34s, so 4.10 and 4.30 are the nearest common sets. Use the calculator with your exact sizes.
Nominal dimensions. Fitment depends on your vehicle, lift and wheels. Updated 2026-11-14.