Polo Bikes

Are these the ones Chan had? His wouldn't clamp hard enough on rear and kept slipping. It says their designed to be used with snail cams which are a type of chain tensioner

Chan had Echo TR like mine, and I bought them when he switched back to Paul hubs; the bolts are fine on bare steel but they don't grip fresh powdercoat very well. The Tensile track hubs I bought came with serrated domes under the bolts so if these use the same ones there should be no slip.