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Mr Mahon was one of about 20 riders met in the Octagon by Dunedin organisations supporting White Ribbon events.
He said the Dunedin stop was just one of many on their week-long tour of the South Island, which aims to highlight New Zealand's poor domestic violence record.
''We've been going around talking to people, schools and different groups, and pushing the fact that men need to stand up and speak out about violence towards women.
''We're good at rugby, we're good at a lot of things, but we're also good at beating up our families, and we need to stop it.''
The South Island tour continues in Oamaru today and will finish in Picton early next week.
A similar tour is being held in the North Island.