The previous record holder for world's steepest street was Baldwin Street in Dunedin, New Zealand.
Harlech resident Gwyn Headley, who led the campaign for Ffordd Pen Llech to be recognized, said he felt "utter relief" to have finally won out.
A north Wales town has swooped in and taken the title for the steepest street from New Zealand.
When he looked into it further, he realised the street's measurements were steeper than its New Zealand counterpart.
The global authority on all things extreme and record-breaky today announced Ffordd Pen Llech in Harlech, Wales as the new title-holder for world's steepest street.
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Another local resident, Sarah Badham, who runs the town's Facebook page, said she realized Gwyn "was onto something" when he posted in the group suggesting the street may be the world's steepest. "I feel sorry for the New Zealanders - but steeper is steeper".
She hoped the crowds would get smaller, but expected many would continue to visit "because it is a tourist attraction".
"I think it could be potentially transformative for Harlech because we rely so heavily on tourism here".
"For the purposes of this record, a "street" or "road" is defined as a thoroughfare which is used by the public who have right of access to drive vehicles along it to get from one destination to another", he told The Telegraph. "Guinness World Records were ultra-specific in the criteria they demanded for Ffordd Pen Llech to qualify as the steepest street in the world, and although we were confident in meeting or exceeding nine of them, I was anxious about the 10th". The 68-year old has become somewhat of a tourist spectacle himself in recent years thanks to his habit of running and skipping up and down the street as many as 30 times a day.
Craig Glenday, Guinness World Records Editor in Chief, said the residents' "will-power" had paid off.
'I hope Harlech enjoys the celebrations and that the new title brings lots of people to the lovely town, to experience the world's steepest street for themselves'. "I'm not going to get over this, this follows the cricket for me so we're still very angry".
The council would consider what changes were needed, but "it may be as simple as altering the wording from the world's steepest street to the southern hemisphere's steepest street", he said.