The Rohloff dropouts are adjustable to tighten chain, look at the pdf drawings they have on thier website. I do not know why you would need an ebb when you can just loosen 4 allen head bolts and slide the dropouts back. The dropouts are massive by the way,( and heavy) and they make one that you can hang a chain tensioner on if you decide to have a front deraileur and two chain rings up front.