British endurance cyclist Mark Beaumont has smashed the Guinness World Record for the fastest circumnavigation of the planet on a bicycle, riding 29,000 kilometres inside 80 days.

He rode for 16 hours a day, visiting Poland, Russia, Mongolia, China, the United States and even making his way through Australia.

The Scottish adventurer began the long ride across the Nullarbor Plain.

“It’s literally about riding to the next horizon,” Beaumont said after completing his marathon ride under the Arc de Triomphe in Paris.

“I’ve barely walked for two-and-a-half months.”

The challenge was part of a lifelong goal to circumnavigate the globe 40 days’ faster than anyone before.

“I’ve worked towards this for the past 20 years. It’s not something that I just rolled out of bed and tried to do,” Beaumont said while he was in Australia.

Officially made it around the world in 78 days,14hrs & 40 mins. Thx to all the supporters and support teams. https://t.co/fp8LxjnSCQ #80days

— Mark Beaumont (@MrMarkBeaumont) September 18, 2017

Beaumont burned more than 9000 calories (37,656 kilojoules) every 24 hours, completing the ride in 78 days, 14 hours and 40 minutes.

He also broke the record for the furthest distance cycled in a single month, having travelled 11,315km from Paris to Perth last month.

But the journey was not without its troubles. He battled poor weather conditions during the trip and suffered a serious crash in Russia on day nine.

“I broke a tooth and smashed my elbow,” he said.

It did not stop him from reaching his goal.

“It’s just the sleep deprivation. It’s after weeks and weeks and weeks, it’s just the long, long hours you spend in your head, you know, really battling,” he said.

“And you just need to decide you’re never going to stop.”

The record was previously held by New Zealander Andrew Nicholson, who in 2015 managed the feat in 123 days.

British adventurer Mark Beaumont celebrates with his two new world records as he arrives in Paris. Photo: EPA