Used to be in Sydney but am in Manila, the Philippines, i bike at a place called BGC. it's nice for city biking just avoid the main roads. trails over here are good for gravel.
1991 Diamondback Axis modded for disc brakes (203 rotors, XT quad hydraulic pistons). Frame able to handle 27.5 x 1.95 Maxxis tyres, not sure if it can handle something wider like 27.5 x 2.1 though. front suspension via redshift shockstop stem, rear suspension via cane creek eesilk seatpost...