Aqua flow tread aqua flow derives from car tyre technology introducing carefully shaped channels or sipes across the tyres tread to drain water away and let the tyre grip the surface more effectively lightweight nylon casing nylon is a robust and durable artificial fibre used by most manufacturers for utility tyre casings traditionally it lacked the flexibility of the polycotton casings preferred by 233lite riders but was lighter in weight than polycotton threads now vittoria has s