Rotor's years of experience in drive technology are reflected in the super lightweight and precisely shifting UNO cassette. The open design consists of a high-strength steel alloy (eight small sprockets) combined with heat-treated 7075 aluminum (three largest sprockets). This gives the UNO cassette an extremely stiff structure while keeping the weight to a minimum. The surface coating reduces friction to a minimum, thereby increasing the lifespan of the cassette. Thanks to the freehub technology, the UNO cassette can be combined with the UNO group as well as with 11-speed groups from Shimano, SRAM, and compatible systems. New additions include 11-30 and 11-32 for a wider range. Despite the short gear ratios for steep climbs, these variants still offer smaller jumps in flat terrain compared to other options.