While there still seems to be some confusion as to which street is steeper, with Welsh Athletics and the UK running calendar describing it as a chance to run up the 'World's Steepest Street', the organisers say it is all a bit of fun.
"The battle from the previous holders in New Zealand to take the title back has captured imaginations worldwide and people have flocked to Harlech to walk, cycle or even roll down the street," they said.
Ffordd Pen Llech was briefly recognised by Guinness World Records as the world's steepest in 2019. The two towns have been linked by a friendly rivalry ever since.
In November 2019 Dunedin surveyor Toby Stoff convinced Guinness' to overturn the decision, after travelling to Wales to measure the street himself.
"I hope everybody got a chuckle out of it but we've proven we're the steepest by a long way," he said. "You don't need a theodolite to work that out."
A spokesperson for Dunedin NZ said that this time they might have been pipped to the post. Since the demise of the Jaffa Race and the Baldwin Street Gut Buster, events were thin on the ground in Dunedin. Harlech can claim the Steepest Street Race, if not the steepest street.
The charity race sets off on 27 March with proceeds going towards local causes including Harlech Triathlon Club and Snowdonia Mountain Rescue.