An elite international mountain biker has set the fastest officially recorded time for riding the 1,000-kilometre Munda Biddi trail end-to-end, and says he has already thought about trying to beat his own mark.

Perth's Declan von Dietze completed the ride from Albany to Mundaring in four days, six hours and 39 minutes, nearly a full day faster than the previous unofficial record.

Von Dietze, 22, set out to break the record to inspire people to take up mountain biking.

"We've got the world's longest [off-road] mountain bike trail here," he said.

"Why not come out in our own backyard and have a go at competing against the best kind of conditions and seeing just how hard you can push yourself?

"On top of that, it's really cool to be able to actually come out here and showcase this to the rest of the world."

Declan von Dietze crossed the finish line in Mundaring on Thursday afternoon. ( ABC News: Tom Wildie )

Von Dietze completed the ride unassisted, sleeping on the ground about three hours a night and riding up to 20 hours a day.

He was accompanied by a film crew, but they were not allowed to help him in any way.

"It was very tough, a very long four days, it's definitely some of the hardest riding I've had to do," he said.

"It's good to finally be done. The hardest thing is just the sleep deprivation."

An exhausted von Dietze was met at the finish line by his mum Kay. ( ABC News: Tom Wildie )

Munda Biddi Trail Foundation chairman Peter Verluis said the ride was no mean feat.

"Riding on a trail is sort of two to two-and-a-half times more strenuous in terms of energy burnt than on a road. It's tough, tough riding," he said.

"The terrain is tough. There are parts of the terrain which are almost path-like, from Albany through to Denmark is smooth, fairly level, good clay soil.

What is the Munda Biddi Trail? Munda Biddi means "trail through the forest" in the Noongar Aboriginal language

Munda Biddi means "trail through the forest" in the Noongar Aboriginal language The trail was completed in sections, with the first part between Mundaring and Collie opening in 2004

The trail was completed in sections, with the first part between Mundaring and Collie opening in 2004 Part two was finished in December 2008, taking the trail to the halfway mark

Part two was finished in December 2008, taking the trail to the halfway mark The first cyclists set out from Albany on April 7 2013, with the trail officially opened in Mundaring later that month

The first cyclists set out from Albany on April 7 2013, with the trail officially opened in Mundaring later that month Now, around 21,000 people use the trail each year

"But other parts are just sandy and then up in this top end [at Mundaring] it's the pea-gravel. It's very fine, slippery, loose gravel.

"It's got a bit of everything."

Mr Verluis said he hoped the ride would encourage more people join the Trail Foundation and get on their bike.

"Certainly this cause of Declan's has caused huge exposure ... I wouldn't be surprised if we have doubled our numbers," he said.

"What we really need though is more people using the trail. That's what we want and that's what this is all about."

Von Dietze said he was looking forward to a hot shower and a good night's sleep, but did not rule out trying to better his effort.

"I was trying to work out how I could do it in under four days. I think it is definitely a possibility," he said.