The family of a County Down man who died on a charity cycle in Wales have said they are "so proud" of everything he achieved.
Gareth Crockett, 27, from Moira died in a road accident in Anglesey on Wednesday.
He was on a sponsored bike ride to raise money for Leukaemia Research in memory of a friend.
Jonathan Crockett said cycling was his brother's "passion".
"Gareth's a very dedicated person. He strived to do a challenge that would capture people's imagination," he said.
Mr Crockett was trying to raise £10,000 by riding more than 450 miles (724 km) and running four marathons in eight days.
The sponsored ride began in Belfast and was due to end with this weekend's London Marathon.
He was with a group of five trying to complete the challenge in memory of their friend John Erwin, who passed away in May 2010.
"He was a close family friend. He lived next door to us," Jonathan Crokett added.
"He got diagnosed with leukaemia and passed within a month. So it was tragic.
"Gareth just wanted to do something that would have made John proud and he definitely achieved that.
"We would like to thank everyone for their continued donations. It is a massive comfort to the family.
"He (Gareth) was a man of few words but what he said was very intelligent and had a great dry wit. He was just a fun loving guy with a great sense of humour.
"We are so proud of him."
Mr Crockett died following a crash with a silver Vauxhall Corsa between Gwalchmai and Llangefni on 13 April.
The 77-year-old car driver was arrested and bailed, pending further inquiries.
North West Wales coroner Dewi Pritchard-Jones opened an inquest into Mr Crockett's death, in Caernarfon, which was then adjourned.
Gareth had attended Wallace High School in Lisburn and later studied at Oxford and Bristol Universities.
From there he went to work as a management consultant at Towers Watson Management Consultancy, in London.
His sister Emma described him as a keen athlete, who loved to cycle and run.
"Gareth was very well travelled in his 27 years," she said.
"He had travelled around Australia on a gap year and cycled throughout Europe.
"He took his bike everywhere he went on holidays; in fact he cycled up the east coast of America and back down the west coast."