I need the Triumph part number for the correct 18t front sprocket for my 99 Legend. My dealer can find them for Americas and Bonnies, and perhaps they are the same? Can't find anything except the 17t on Bike bandit, and of course, there are no Triumph numbers listed there. Also, I have a new chain guide rubbing block coming, but my bike only has 4000 on it. While I would like to go up one tooth on front, would I be better waiting until the chain needs replacing too? I am concerned that a new sprocket with the factory chain at 4000 might have issues? Also, in the factory manual, they talk about replacing the chain in one piece by removing the subframe. Everything I have read uses a riveting tool to put on the new chain with the attachable link. I am assuming the subframe removal route must be long and tedious, at least enough so to outweigh the advantage of having a solid chain with no riveted links? If so, can anyone recommend a good chain tool? All the reviews I've seen don't exactly rave about what is available.