Ms Bullen will tackle 4961 kilometres for Elke, also known as Flea, who lost her life to Cystic Fibrosis in 2007. 

Along the way Ms Bullen will create awareness of the recessive genetic condition and raise money for Cystic Fibrosis Australia. 

Ms Bullen said it had always been her sister's wish to travel to Broome. 

"(Flea) had always wanted to go to Broome when she got her licence and turned 18," she said.  

"Unfortunately she passed away when she was 16 so she never got to do it. (The ride) is a tribute to her as well as raising money for Cystic Fibrosis."

Ms Bullen said Flea was diagnosed with the condition at eight weeks of age. 

At 12, Flea required oxygen constantly and could not leave the house without the assistance of her wheelchair. 

She was put on a transplant list in 2004 and recieved the first children's heart double lung transplant at The Alfred hospital. 

The transplant was successful and it wasn't until three-and-a-half years later that Flea became sick again. 

"It was very, very tough," she said. 

"It's hard to go from a life of hospitals to a life of normal where you all think it's going to be fine, then back to (hospitals) again - it's really tough."

Ms Bullen, the manager of Snap Fitness Sunbury, said she would begin her ride on April 9 - Flea's birthday - and planed to arrive in Broome on May 23. 

She said her parents and fiance Andy would form her support team along the way. 

Ms Bullen said she wanted to help find a cure for Cystic Fibrosis and prevent other families from going through the same pain as her family. 

"I know how hard and excruciating it is for a family to lose someone to (Cystic Fibrosis)," she said. 

"I hate to think of other people going through that.

"If that could prevent it from happening to others, then it is a good thing."  

Ms Bullen said she would like to thank her sponsors - Snap Fitness Sunbury, The Angry Butcher Bike Shop Sunbury, Pure and Lean Nutrition System Sunbury, Flush Fitness Sunbury and Slipstream Signs Sunbury. 

To donate to the Ride for Flea visit www.facebook.com/RideForFlea or www.everydayhero.com.au/ride_for_flea