Marcus If I were you, I'd replace the sprocket bolts with new nuts and bolts, and loctite them. I have replaced several rear sprockets and the re-used bolts never stay tight. They can loosen and ruin your hub before you know it. As far as tubes go, I find an old tube, split the old tube on the rim-facing side of the tube all the way around, then put the new tube inside the old one. A little baby powder will let the inside tube slip inside the outer tube and reduce pinch flats.