The boyfriend and colleagues of Joanna Yeates have joined a charity cycle challenge in her memory.
The 25-year-old landscape architect from Bristol disappeared on December 17 and her body was discovered on Christmas Day.
The cycle challenge has been organised by her former employers, BDP.
Twenty-nine employees from the Bristol office where Miss Yeates worked set off at 7.30am wearing bright red and white shirts with the wording Cycle for Jo.
They were led by Miss Yeates's boyfriend Greg Reardon, who lived with her at the time she was murdered. Mr Reardon reported Miss Yeates missing after returning home to their flat from a weekend away in Sheffield.
Cycle for Jo will raise funds for Missing People, the Red Cross and the RSPCA - charities chosen by Mr Reardon and Miss Yeates's family.
The relay ride has involved more than 200 riders from BDP linking offices in the UK, Ireland, and the Netherlands.
During Tuesday's leg the cyclists were riding from Bristol to Winchester. The first riders set off from London on May 6 and the last team will arrive back in London on Wednesday, which is International Missing Children's Day.
As he prepared to set off on a borrowed bike, Alex Shovelton, 26, said: "Jo was a good friend and this means a lot to us."
Vincent Tabak, a Dutch engineer who lived next door to Miss Yeates, has pleaded guilty to her manslaughter but denies murder and is due to face trial at Bristol Crown Court on October 4.