How does the wheels stay on the track?

A distributor from Mena Arkansas says:
May 1, 2022
Does the Concave and the Convex door roller system have a spring loaded wheel to keep it mashed to the bottom track???
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Tom from SWISCO responded:
May 4, 2022

I'm not sure what roller it is you're referring to, unfortunately, but there are few bottom rollers I can think of that have any kind of spring load action like you describe. In most cases, the rollers are kept in the track just from the weight of the door, as well as the contour of the wheel in relation to the track rail.
48" Sliding Mirror Door Bottom Track
48" Sliding Mirror Door Bottom Track
23-240
$20.45
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