19" Disc
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19" Disc. The disc and hub do the cutting and carry the load at the front of the opener, so worn parts here show up fast in seed placement and boot wear.
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How to check for wear
Ground conditions, sowing speed and acres all drive how fast a disc wears, but the number to watch is diameter. Most operators replace around 17 inch — push on much past that and you risk poor seed placement and, worse, chewing out your boots to save a disc. Below 16 inch is a hard stop if you don't want to be buying boots too. Remember a smaller disc has to spin more times to cover the same ground, so wear accelerates as it shrinks. And always run bevel to the furrow, or it won't cut.