While there's been a lot of focus on the large end of cassettes lately, OneUp's MiniDriver is an upgrade that has the potential to make an even bigger difference to your available gear range. The driver replaces the standard Shimano body, and its shortened length makes room for the smaller 10-tooth ring. The small 10/12-tooth cluster is cleverly mounted with a deep lockring and spline interface on the backside. The system will be available for hubs with DT Swiss internals only, for now, and begins shipping in May.
Combining the MiniDriver with OneUp's 50-tooth Shark system creates the largest 1x11 cassette available.
Is that a feather?
2016 Sea Otter Classic Pit Bits