Bad news...I got the Blackburn kit, there's not enugh room between the inside of the dropout and the smallest cog for the nut/bolt to fit. And no, I can't just get a shorter bolt...the nut or the head of the bolt would have to be about as thin as a dime in order for it to work. Shucks. If i went with the clamps...how much weight can you expect to carry w/o danger?