The pair started planning their bike ride last year, and at the time had planned for Annison’s wife, Diane, and Martin’s wife, Catherine to meet them in Spain at the end of their trip.
However, when Diane passed away in December from a rare aggressive sarcoma cancer of the uterus, the two friends both retired early and pursued the trip in her memory.
Martin, whose mum died from a heart attack last year, said: “We came up with the phrase The Beery Bikers… we’re really trying to turn something that’s not so positive, into a bit of fun.”
They set off on 27 August from The Crown Inn in West Haddon and since then the cyclists have raised £7,500 so far, with a goal of £10,000.
Martin, 58, said: “The support we’ve got from strangers and meeting people along the way has been fantastic.”
Biking up to seven hours a day, the terrain proved to be “quite a challenge” according to his sidekick.
During their adventures, which saw them overcoming nearly 17,000 ft (5,182m) of hills and mountains on the way, they each burned more than 55,000 calories.