Odyssey bluebird chainthe bluebird chain uses a standard kmc 510 hx link and plate configuration and includes a kmc pintle half link thats pre installed at the factory the idea of the pre installed half link is simple if you need the half link then shorten the chain at the other end if you dont then shorten at the half link end the bluebird is the first production chain that odyssey have ever offered for sale and it stands as the precursor to an all new design that they been working on