Talking Flynn with red/yellow wheels?

Like GreatGordonFan said, they were taken from old Plarail items. Neither of these wheelsets are the originals with the "rim and tyre" texture. My only assumption as to why the owner/s would take them off would be they wanted the unique detail for some sort of custom, or (less likely) to fix something that had black wheels but they didn't have other sets laying around.

Oddly, the trailer for the red wheeled one still has spokes and Fisher Price holes, so they couldn't think the originals were inferior to TOMY (the first reason I thought of).