I've got a street legal 98 WR400 and replacing the chain/sprockets as they are pretty worn. I ordered the sprocket and o-ring set (it had a roller chain on it) and realized the rear sprocket I odered is too big for the hub. The hole in the center of the new sprocket is about 6" and the old sprocket hole is about 5.35". That kind of hub do I have? Both have a 6-hole pattern, but the hub/wheel must be from some other yamaha. Are WR hubs and YZ hubs different? Less important-The rear sprocket was marked "C49" but its actually a 46. 14/49 is stock YZ gearing so I naturally ordered a YZ package as I'm trying to keep the bike geared as much like a YZ as I can. Yes the bike is street legal but I'd like to keep it as mud/trail/dune worthy as possible. Sorry in advance, I've only had the bike 6 months so I don't know all the history.