[rifter]

I'm glad your working on brakes. I'm REALLY concerned about how you mounted and the design of the swing arm. The CBR600 has plenty of power, your axle diameter is what looks like 1 inch, the spacing of your bearings is good but you will need more bearing support beside your sprocket and disc when you mount them or you can scratch that axle because it will bend even if it's 4130 chromoly. I'm not trying to bust your build just trying to point out what you will need to do, I can give advice because I've built this before. You have welded your mild steel swing arm to high carbon steel, this will break sooner or later depending on when the stress gets to be too much. If you want my input I will gladly help, if you don't I'll have a moderator remove my post.