On the day world champion cyclist Melissa Hoskins would have been celebrating her 33rd birthday, her family and friends were honouring her life in a memorial service in Adelaide.

The service, which is also livestreamed by AusCycling online, was attended by loved ones, friends, athletes and members of the public at the Adelaide Town Hall on Saturday afternoon.

The mother-of-two was struck by a car allegedly driven by her husband and renowned cyclist Rohan Dennis outside their Medindie home in Adelaide's inner north on December 30.

In a touching eulogy, Hoskin's father Peter thanked people who had reached out to the family with kind tributes on behalf of his wife Amanda and daughter Jessica.

"Today's memorial is being held on what would have been Mel's 33rd birthday," he said.

"We have constant reminders of Melissa in our lives and we reflect on her absence daily."

"Her cycling journey has taken Amanda, Jessica and I to places we might never had journeyed, adding yet another dimension to our memory collection.

"While we are still grieving, today is about celebrating Melissa, celebrating her love of life, the friendship she valued, the achievements and her triumphs."

Sister Jessica Locke said they had planned a "sisters-only trip" to New South Wales's Hunter Valley for Hoskins's birthday to make up for years of missing out on birthdays, Christmases and weddings.

"I am so sad that we didn't get the chance to catch up on all that time apart," Ms Locke said.

"I still go to message and call you all the time.

"There are so many things that only you know and only you understand.

"I feel so lost not being able to talk to you about them anymore. No-one can ever replace that."

Ms Locke said she had "many beautiful memories" of her sister she would "cherish forever" alongside items such as a Kermit the Frog mug Hoskins bought during the 2012 London Olympics, a sister friendship bracelet and a Spanish cereal bowl.

One of those memories was when her "sister and best friend" tattooed Ms Locke's first name on her right foot alongside an infinity sign.

"I was firstly shocked that she got a tattoo but then immediately felt so proud that she'd picked my name to put there," she said.

Dennis attended the memorial with their two children but did not speak.

Her former teammate Amy Cure described Hoskins as "fearless" and a woman who "opens her arms and expects nothing in return".

"I see a cyclist with strength, power and resilience — the courage not only to lead a team but to lead a nation," Ms Cure said.

"I see a nurturing mother, compassionate, protective and extraordinary who offers the purest of love with a little bit discipline and a large amount of adventure."

"Mel, your spirit will be forever engraved in my heart and your connections will continue to inspire me throughout my own journey of life."

"Happy birthday, my beautiful friend."

Hoskins was laid to rest in a private funeral at her hometown of Fremantle in January.

Her former teammates paid tribute and held a minute silence before the Women's Tour Down Under race in the Adelaide Hills in January.

Hoskins was part of a team that won the 2015 UCI Track Cycling World Championships as well as competing in the 2012 and 2016 Olympics.

She retired in 2017 before getting married the following year to Dennis.

Dennis has been charged with causing death by dangerous driving, driving without due care and endangering life.

He has been bailed to appear in court in March.