SYDNEY, September 15- Jamaican sprint superstar Usain Bolt hopes to lower his 100 metres world record from 9.58 to 9.4 seconds, a mark he believes would never be beaten, a report said on Wednesday.However Bolt, in Sydney for 10-year anniversary celebrations of the 2000 Olympics, said bettering the time he set last year in Berlin was not an "obsession".
"That’s where the record is gonna stay," he told Sydney’s Daily Telegraph, referring to 9.4sec. "But it’s not an obsession. I already have the world record."
Bolt, a double world record-holder in the 100m and 200m and the Olympic and world champion in both events, also said he hoped to seal his legacy at London 2012.
"London is a very big stage for me because there are so many Jamaicans in London," he said. "It will change my career there. I’ll keep doing, but I’ll do something different."
Bolt is reportedly considering tackling the 400m and challenging American legend Michael Johnson’s 1999 record of 43.18sec.