The Radio 2 presenter and Ammanford native will leave Glasgow on November 9 for a five-day ride through all four UK nations, finishing in Cardiff on November 13 for this year’s BBC Children in Need appeal.
He recently trained on Barry Island with sports scientist Professor Greg Whyte OBE, who will support him throughout the challenge.
Mr Evans said: “When I said yes to this challenge, I knew it would push me well outside my comfort zone.
“It’s going to be tough, demanding and probably a little daunting at times, but I’m ready to give it absolutely everything I’ve got.”
BBC star Owain Wyn Evans is feeling “really good” after a training ride in Barry Island, just days before a 400-mile cycling challenge for charity (Image: Instagram)
The broadcaster, who attended Ammanford Comprehensive School, admits cycling is not his usual sport.
He has called himself “not a cyclist in any way, shape or form” and admitted to having “a couple of wobbles” during training.
Speaking to fellow Radio 2 presenter Sara Cox, he said: “I’ve got to be honest, I’ve had a couple of wobbles.
“Over the weekend I was like, I’m so not ready.”
Despite his doubts, Evans felt “really good” after the Barry Island ride.
The ride starts in Glasgow and will take him through Scotland, Northern Ireland and England before he reaches Wales.
It is the longest distance ever attempted in a Radio 2 fundraising challenge.
Professor Whyte, who has guided many celebrities through endurance events, will support Evans throughout the ride.
It is not Evans’s first major Children in Need fundraiser.
In 2021, he completed a 24-hour drumathon that raised more than £3.8 million.
This year, he has swapped drumsticks for handlebars for a very different endurance test.
During the training ride, Evans and Professor Whyte stopped at Marco’s Cafe on Barry Island.
Evans said he felt “really good” afterwards, easing fears raised by his earlier doubts.
BBC Radio 2 shared footage of the ride on Instagram and joked: “Fancy popping in for a cuppa with Gavin and Stacey?”
The ride will test Evans physically and mentally, but he is determined to give it everything he has.
Evans is due to cross the finish line in Cardiff on November 13, the day of the BBC Children in Need appeal.
Actor and singer Luke Evans, who is also from Wales, sent him a message of encouragement and chose Foo Fighters’ “Everlong” as an anthem to motivate his training.