California
Super Star Member
- Joined
- Jan 22, 2004
- Messages
- 14,615
- Location
- An hour north of San Francisco
- Tractor
- Yanmar YM240 Yanmar YM186D
Source: GoodyearAg.com, 2003.
That site no longer exists. This Google search should find related info: tractor tire ballast chart.
In this chart 75% is described as filled just above the rim with the valve stem at the top, and 40% fill (half the weight of a 75% fill) is with the valve stem at 4:00 o'clock.