Where does “rodillera” come from?

rodillera (Spanish) comes from Spanish rodilla, from Old Spanish rodiella, from Late Latin rotella, from Latin Rota, from Proto-Italic rotā, from Proto-Indo-European Hróth₂-eh₂, from Proto-Indo-European Hreth₂- — to run.

rodillera (Spanish): feminine singular of rodillero; knee patch;...