No adaptor no compromise no sacrifice our all new wide range 10sp cassette is made for the mtb rider that needs just a little deeper climbing gear but refuses to give up performance smooth shifting is sacred so we focused on the integrity of the shift all while extending the gearing in a fully finished comp level cassette no awkward gearing steps no unpleasant missed shifts simply a proper 10sp wide range cassette this is a full cassette and not an expander adaptor the goal was