Heidenau 400-H19 K28 71P TT Universal Sidecar TyresHeidenau 400 H19 K28 TT 71P Universal Sidecar Tyres The K28 is our newly developed sidecar tire. Drive and steering forces are distributed over a large area of contact thanks to the angular contour of the tire. This and the stable longitudinal profile in the center of the tire reduces wear and increases mileage. High wet grip is achieved through the use of new additives to the mixture, and the special tread design. Rubber and construction Great tread