A day in the life of a biker is being auctioned off by the Comanchero Motorcycle Club.

The Daily Telegraph reported on Monday that the club advertised the chance to spend eight hours with three or four Comancheros on their Harley Davidsons in Sydney via Internet auction site eBay.

The lucky person will also get the chance to revisit one of Australia's bloodiest biker wars, known as the Milperra Massacre. On Father's Day in 1984, 4 members of the Comancheros and two members of a rival gang were killed at the Viking Tavern.

$1,500 is the reserve price for the auction, with half of the final bid going to cystic fibrosis unit of The Children's Hospital at Westmead.

Club spokesman Charlie Graham says, "We could've done this as a business for ourselves, but one of our members' 10-year-old daughter, Sarah, has cystic fibrosis and we thought, `Why not give half to a charity.'"