Larry King, from Sutton Farm in Shrewsbury, is riding the A to Z of Shropshire places – a total of 205km, in less than 24 hours, all to raise money for Shrewsbury Food Hub.
Starting in Atcham, he and pal Rick Robson will cycle to Berrington, Condover and Dorrington, before making their way through the rest of the alphabet before they've visited 26 towns and villages.
Some creativity has been used to deal with the fact there are no towns beginning with X and Z - so Larry is going to towns which features the letters, Ruyton-XI-Towns and Fitz.
Larry, who works as a marketing manager, said: "The idea is that we'll do this all in a day. We'll start at around 6am, and then get back some time in the evening.
"This is the furthest I've ridden in my life. I've done a couple of 100-mile rides before and did a six-day ride which was pretty tough. But this will be the furthest in one day."
Northampton-born Larry, who lived in Perth and Melbourne for many years and has the Aussie twang to show for it, returned to the UK and has been living in Shropshire for about 20 years.
He added: "Shropshire is a great location to be out doing an adventure like this."
His ride is part of the Shrewsbury Food Hub's FoodHub5 initiative, in which several of the charity's supporters are taking on fitness challenges to raise money this month.
To support Larry, visit justgiving.com/fundraising/Larry-King1.