Since so many of you tell us you don’t re-position your Reformers frequently, we’ve made the Allegro 2 wheels optional. For those who need portability, wheels are a convenient, economical add-on. For those who want to store an Allegro 2 vertically, wheels are required.An undercarriage cover is included with the wheel kit for the Allegro 2. Attractively protect the mechanisms on the underside of the carriage from dust, dirt, and hair, with this cotton twill cover. Fits underneath the carriage frame and secures with velcro strips.