I am about to go to 15/45 on my 07. I know the stock gearing is 16/43. Is the stock chain pinch 530/525/520? And more importantly, if you have your gearing set up like this how many links did you have to cut off the chain? I would just order one of those Driven or Vortex power up kits with the pre-cut chain but I want to get a different custom rear sprocket.