If I remember correctly, they were designed to steer tighter to the left then to the right, being that you would cut your lawn mostly with left turns, and that you would be able to cut tightly around trees, as the mower discharges to the right.
Hope this makes sense, it sounds good in my head but may not to others.
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128 X 2, 129, 149, 1250, 1450 x 2
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