BMX champion Sarah Walker has tested her nerves by riding around the edge of New Zealand's tallest building - Auckland's Sky Tower.

Walker, a silver medallist at the 2012 London Olympics, navigated her bike around the 192m-high SkyWalk circuit five times today to celebrate 10 years since the attraction opened.

Despite being tethered to the building the ride got her blood pumping, the 29-year-old said.

"Getting out onto the ring it felt as if I was about to start a world championship race. Every time around was scary, I think it almost got more scary as my brain realised what I was actually doing," said Walker, who walked the circuit earlier in the year.

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Olympic BMX rider Sarah Walker gets ready to head out for her ride around the edge of the SkyTower to celebrate the 10th birthday of the AJ Hackett Bungy SkyWalk. Photo / Dean Purcell
Olympic BMX rider Sarah Walker gets ready to head out for her ride around the edge of the SkyTower to celebrate the 10th birthday of the AJ Hackett Bungy SkyWalk. Photo / Dean Purcell

AJ Hackett Bungy New Zealand managing director and co-founder Henry van Asch, a former New Zealand mountain bike champion himself, said he couldn't think of a better way to celebrate the SkyWalk experience's 10th birthday.

"At Bungy we're all about challenging people with new experiences, and while most people would find the walk itself a challenge, Sarah has taken it to another level today by riding around it."