After the cycle challenge, Hanlen hopes to do well in the forthcoming nationals and Oceania games before competing in XC mountain biking events in Australia and the US.
Her advice to anyone wanting to start is to just get out and do it - even though she's a busy person, she's adjusted her lifestyle to fit in training as well as work and family time.
This year Karen's children, aged 5 and 7, are entering the 5km Kids Heart Ride event for the first time.
Kay Brake, Contact Lake Taupo Cycle Challenge event director, said: "Karen is another inspiring athlete and it's wonderful that she's returning this year ..."
Contact Lake Taupo Cycle Challenge is New Zealand's largest cycling event. More than 8000 riders from New Zealand and 20 countries across the globe take part each year.
The challenge is best known for its 160km Bike Barn Solo, the one-lap circumnavigation of Lake Taupo.