More than 400 mountain bike riders lined up to race.

The challenge, otherwise known as The Willo Enduro, the event is held in memory of late Highlander James Williamson.

Williamson died at the age of 26 in March 2010 due to an undiagnosed heart condition.

He was a world solo 24-hour champion and top-level XXCO and XCM rider.

There were four distance options on offer on Sunday - 13km, 25km, 50km or 75km.

Racing got underway at 8.15am, with the young riders in the 13km category.

The adults followed at 9.30am.

After a tough contest Brendan Johnston took out the 75km open male category.

Jenny Fay won the 75km open women's category.

In the open male 50km category, Andrew Arthur brought home the line honours.

Eliza Kwan took out the open female 50km race.

For the first time in 2015, the James Williamson Enduro Challenge was included in the Australian Marathon (XCM) Series.

All people who finished on the podium in the 50km and 75km categories also received medals.

Jenny Fay and Brendan Johnston were awarded the series leader jerseys.

Categories ranged from the under-13s through to grand masters.

The main weight of riders was concentrated in the 50km open and masters categories, with some very strong efforts as usual.

Many juniors who attended the James Williamson development camps in 2014 were present in the under-17s and under-19s categories, as well as a strong contingent of riders from Chevalier College.

Organising the challenge is very much a collaborative effort.

The Southern Highlands Cycling Club teams up with the expertise of CORC (Canberra Off Road Cyclists), and many friends and supporters of Williamson completing the team.

Strong support is also thrown in by local businesses.

All proceeds from this race are put back into junior development with an annual training camp held each year in November.

Details of the next James Williamson Development Camp will be available on the website when it comes to hand.

For more information, go to www.jameswilliamson.com.au