Bottom bracket standards have gotten a bit out of hand in the last few years requiring frame designers to use one system over another. Instead of succumbing to one brand's standard Niner saw this as an opportunity and developed the CYA Insert. Now you can press fit an adapter for BB30 BB92 PF30 or standard English threaded bottom brackets into your CYA equipped frame. Say adios sayonara or Audi 5000 to conformity and hello to options.