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14.9R24 tire size
Tractor drive tire.
What 14.9R24 means
14.9-inch nominal section width, R radial, for a 24-inch rim. The bias-ply version is written 14.9-24. This is the older inch system; the metric equivalent is listed below.
Equivalent sizes
Same height and width, same 24" rim: 380/85R24.
- 340 mm (13.6")
- 340/85R24, 13.6R24
- 420 mm (16.9")
- 420/70R24
- 480 mm (18.4")
- 480/65R24
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
- 54.8 gal (207 L) = 457 lb (207 kg)
- CaCl₂ 3½ lb/gal, per tire
- 556 lb (252 kg) total
- CaCl₂ 5 lb/gal, per tire
- 591 lb (268 kg) total
Firestone hydroinflation tables, 13.0" 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.