TireRig › Tire sizes › Farm
12.4R24 tire size
Tractor drive tire.
What 12.4R24 means
12.4-inch nominal section width, R radial, for a 24-inch rim. The bias-ply version is written 12.4-24. This is the older inch system; the metric equivalent is listed below.
Equivalent sizes
Same height and width, same 24" rim: 320/85R24.
- 380 mm (14.9")
- 380/70R24
Same height, other width — keeps front axle lead/lag about the same; needs the right rim width.
Liquid ballast at 75% fill
- Water, per tire
- 34.4 gal (130 L) = 287 lb (130 kg)
- CaCl₂ 3½ lb/gal, per tire
- 349 lb (158 kg) total
- CaCl₂ 5 lb/gal, per tire
- 371 lb (168 kg) total
Firestone hydroinflation tables, 11.0" rim. Other rims and tire counts →
Sources: Continental Agricultural Tires Technical Databook, Firestone Ag RCI chart, Firestone hydroinflation tables. Checked October 2026. How we source data.