Challenge chicane 33 cross tubular the 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 the challenge chicane 33 cross tubular are designed as a dry grassy dusty or icy conditions use tyre sizewidth 700x33mm casing superpoly polyester casings is a less expensive and more durable option but still offer the qualities of top end tubulars pu