My stock chain is stretched to the limit so I'm in the market for a new one. Im also thinking I should update my sprockets while I'm there. I mostly do trails and mx riding. I've read that the DID ert2 gold chain is a good chain. I also found on rmatv the primary drive package which is chain, spockets sold together for a good price. Would there be any downfalls to the primary drive chain? Also what are the stock sprockets 14, 39?