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Rollerbrake ®
From WikiPedalia
A Shimano trademark for a variant form of hand-operated drum brake. It uses a ring of rollers pushed outward by a cam to engage the brake shoe with the drum. The cam is operated by a cable from a hand lever.
These brakes are prone to fading due to overheating if used in mountainous terrain.
I particularly advise against using a front Rollerbrake, because the front hubs made for these brakes incorporate the infamous and wrong-headed "Power Modulator " mechanism which reduces the effectiveness of the brake.
Also see the article about Rollerbrakes on this site.
