The new Wylde Mountain Bike trail will allow riders to "choose their own adventure" when it is completed at the end of 2021.
The new design, which will be released at public showcase on February 22, will provide six key junctions where riders can select the length and type of trail they wish to experience, according to their skill, fitness and available time.
The proposed M12 Motorway has provided an opportunity for the Western Sydney Parklands to update the current trail which attracts up to 33,000 visitors each year.
Currently there are four different trail sections at Wylde. The kids and three-kilometre loops are aimed at for beginners and inexperienced riders. The six and 12-kilometre loops are for riders with higher level of skill and fitness.
Western Sydney Parklands Trust executive director Suellen Fitzgerald said Wylde is a "great asset" to the community, offering a range of exciting experiences that can challenge beginners to advanced riders.
"It allows visitors to get outdoors in Sydney's biggest backyard and spend time exercising in nature," Ms Fitzgerald said.
"We are confident the new design will see the continuation of the winning formula that has led to it being such a huge success.
"We've engaged leading designers Group GSA & DIRTZtrack to ensure the new facility meets international standards and reflects current advancements in mountain bike riding."
The current Wylde Mountain Bike Trail may require partial closures but will remain open until the new trail is complete.
- The public showcase will be held on February 22 from 2pm to 6pm, at the entry to the Mountain Bike Trail on Ranges Road (off Elizabeth Drive) in Cecil Park.