Mr Walsh, the only unicycler to compete in last year's event, finished three-quarters of the way down in the field.

"I still beat some of them," he said.

This year, Mr Walsh will compete with a new unicycle, but as to whether it would give him a competitive edge, he is doubtful.

His new bike has gears and a smaller wheel. He also built his own handlebars, which are shaped like triathlon bike handles for extra comfort.

"It's so much more fun to ride," he said.

"I will have a bit more control because the wheel is a bit smaller.

"I think I'll probably do worse because the average speed is less than the big one."

The ride last year attracted 112 riders. Armed with a map, participants must be prepared to spend up to six hours in the saddle to reach as many checkpoints as possible in this Orienteering Victoria event.

The specially prepared "Adrian" map is bounded by Muskvale, Spargo Creek, Mollongghip and Eganstown.

Top riders do 60km to 70kmh while leisure riders are expected to accomplish from 15kmh upwards.

"It's like being in your own Amazing Race," said Mr Walsh, who has been practising for the event by unicycling around trails in the Wombat State Forest.

The event offers a discount for unicycle riders and Mr Walsh is hoping to encourage a few more one-wheelers to join in the event.

"It's quite a normal thing in other parts of the world for unicycles to be used in mountain biking events," he said.

"On a mountain bike you're more of a passenger.

"On a unicycle you have to be paying attention all of the time and pedalling all of the time."

The event will be held on November 29. Entries close on Tuesday, November 24.

Visit www.mapsport.net.au for more information and entry forms.