Too short a lead will increase steering effort, but too much lead can reduce load capacity and may cause wobble. Rollability - Rollability is the ease with which a wheel or caster can be rolled. Rollability is affected by wheel size, type of tread and bearings. The larger the wheel, the easier it will roll. A hard, narrow crowned tread rolls easier than a flat soft tread on a smooth floor, but may be hard on floors.
Soft treads protect floors and pass over floor obstrucions more easily.
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