A worn track will destroy brand-new rollers
The bottom track is the road your sliding door drives on, and after years of seized rollers dragging across it, that road gets gouged, pitted, and worn paper-thin. Fitting new rollers onto a damaged track is like putting new tires on a car and driving it down a cratered street — the sharp edges of the worn groove carve into the fresh wheels and the grinding comes back within months. That's why every Apollo repair starts with an honest track inspection: if the rail is damaged, we fix the road before we replace the wheels, and the repair actually lasts.

