DID is an OEM of many Japanese and European brands. Leading racing teams in the Road and off-road sports rely on the technology of DID. DID 428HD: As a successor to the tried and tested 428H, the 428HD used a new technology for manufacturing the rollers. Up to now, the rolls of sheet metal strips have been wound, resulting in a seam and thus a weak point. Using the new technology, the rolls are made of round material and a sewing area is thus avoided. Compared to the standard chain 428D, the 428HD is reinforced by thicker tabs and therefore has a significantly higher tensile strength. - 20-50% higher wear resistance compared to the DID 428HD - strengthened construction