It does actually, because the hooks on Lone Peaks have a slide down lock that closes the hook solidly around the rack. I have both 8 and 10mm and the 10mm can go on an older 8mm tubed rack without issue and the clasp will close, but it will be a little loose and have a tiny wobble. The 8mm hooks won't close down around a 10mm tubed rack obviously (many of the newer types). You can ride with them on that way, they will hang on to the larger tubed rack just fine especially since the backs have a bottom pulled stability cord to hook the bottom of the packs to the frame, but you just lose some of the benefit of the pack/hook design for stability.