The sidewalls of freeride and downhill tyres are subjected to extraordinarily high loads. A rubber profile between the carcass layers ensures stability. The Apex sits on the tyre bead and reinforces the sidewalls of the tyre. The tyre is thus protected from impact with the rim during rough rides over rocky ground. The tyre stays more upright when cornering. It does not bend over the sides of the rim when subjected to transverse loads, and always stays true to the course.