Hutchinson sector tubeless road tyrethe sector tyre was developed to improve performance when racing the paris roubaix classic this race has many cobbled sections and uneven roads the sector tyre therefore performs to an excellent level on any section of rough road the tyre profile is very rounded with a slick section on top and grooved tread sidewalls the tyre does require sealant to be air tight but this reduces the rolling inertia of the wheel and also reduces the chances of getting a pun