N-Tec construction (New Technology) is DunlopâEU™s very best construction road racing tyre.The KR449 rear tyre features a nylon carcass overlaid with two nylon breaker belts and a continuously wound, aramid-fiber tread belt for cooler-running, excellent straight-line stability and virtually no circumferential tyre growth. DunlopâEU™s N-Tec steel bead and its high-modulus bead apex combine to offer improved feel for the rider as the tyre nears its cornering limit, producing the âEUoepredictabilityâEU that has become a signature characteristic of Dunlop road racing tyres.Racing Track Day TyresMade in USA.Triple tread; super grip on the sides, cool running center.Zero growth; no need for major ride height changes.Low pressure; for maximum contact patch.KR451 is bi-directional using Jointless Tread application