As reviewed by Tri220
"These tubs are an out-and-out race set-up with the Ultra Carbon rear as near to a disc (without actually being a disc) as you can get. Paired up on the front with the 81mm Ultra 800, this set is all about straight-line speed. They roll jaw droppingly fast on the flat, urging you to push harder, and the rear wheel gives a satisfying "whomp" as it cuts through the air".
