you don't need to for radials, but I don't think you can mount up the disc kits without rollers - if you don't have to change them, there's really no compelling reason not to use the original style
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
