The wings are hindered W/O the mechanism of a bearing, hence creating a force of friction between the wings and the track, in resulting less damage absorption. Furthermore, it is easy for a low attacker’s wheel to be caught between the wheel and ED145 (especially Flame), causing a lot of recoil.
Its successor, TR145 does not have that problem. When used with AS/WD/EWD/ES/HF\S it can minimize recoil from almost any floor-scrape. This is the only feature that its successor has and ED145 doesn’t have.