Abstract: A concrete mixer comprising a main frame, a large bearing ring carried by the main frame, the ring supporting an outer barrel carrier for rotation, an inner rotary barrel of elastomeric material supported for rotation by said barrel carrier, the barrel carrier having a number of spaced fingers extending away from the ring, there being a flexible strap extending from each finger to the outer surface of the barrel, so supporting the barrel that its wall can be deflected from the outside to dislodge concrete which might adhere to the inner surface, and an elastomeric rotor supported for rotation within the inner rotary barrel.