Challenge open chicane xs 33 cross tyre the new chicane is effectively a hybrid of two existing treads pairing the aggressive side knobs of challenges mud specific limus with the fast rolling diamond pattern centre tread of the grifo xs using challenges open tubular construction with a tread designed for dry grassy dusty or icy conditions sizewidth 700x33mm challenges aramid bead casing superpoly casing offers a less expensive yet more durable option puncture protection