Overall leader Roulston withdraws from Tour of Southland

Hayden Roulston (Calder Stewart) remains in the leader's yellow jersey.

Hayden Roulston (Calder Stewart) remains in the leader's yellow jersey. (Image credit: Pete Bruggeman)

Hayden Roulston (Calder Stewart) has been forced to abandon the Powernet Tour of Southland today, with the New Zealander reportedly suffering from kidney stones.