FOR some people, being at the top of Teesside's Transporter Bridge would be enough to turn the stomach - even if you were standing still.

But adrenaline junkie Kris Holm yesterday rode along the bridge on a unicycle.

He described the 225ft-high landmark as an "urban obstacle".

"It was really good fun because it is such a spectacular bridge with great views," said Mr Holm, 29, of Vancouver, Canada.

"I have done things like this before, and you get used to it. Actually, I enjoy riding while having so much air beneath me."

Mr Holm is known to adventure sports fans everywhere and is renowned as being the best mountain unicyclist in the world.

"It is a lot more technical than regular biking, and you have to go a lot slower," he added.

"But people see it as a pretty cool thing to do because extreme sports are so hot at the moment."

He spends most of his time touring the world looking for more death-defying challenges to undertake.

Fans of Mr Holm's exploits can buy the footage on videos and DVDs.

Despite the dangerous positions he has been in, the worst injury he has sustained is a sprained ankle and a few bruises.

Mr Holm did the Transport Bridge stunt while visiting his friend, Roger Davies, who is the country's biggest supplier of the one-wheeled bikes and works from offices in Billingham, Teesside.