I live in the hills and am quite close to some great trails in Sheppards Hill Reserve. It has excellent singletrack an fire trails and is legal. You can get to it by train from the city, just get off at Eden Hills and start exploring! [ Best to look at a map first...]
Sturt Gorge has some good trails also, just off the back of Bellevue Heights.
Also, all State Forests are legal to ride. Try looking at any of the Kuitpo Forest areas near Meadows, or further north, Mt Crawford Forest. [ Need a car ]
Belair National Park, Cleland Conservation Park, and Andersons/Randells Reserve are all quite close to the city with awesome riding, but are now illegal to enjoy on a bike.... bummer.
Bike SA with others have built and mapped a network of trails in the Cudlee Creek / Fox Creek area. Its further north in the hills, on the way to Gumeracha from the city [ need a car ] Awesome trails.
Try sifting through the websites i listed, there are some maps in there...
but mostly they're just maps on how to get to the trails.
Bestthing is to find someone a litle more experienced than yourself,
and get them to show you some trails.
Or go along to a race and maybe enter the beginner class.
Which areas were you lookin at in particular?
Where are you based?
marschall, i'd give Parra Wirra Recreation Park a try.
Mt Crawford forest ajoins it too.
They're both next to the Resovoir, not too far from Gawler.
I've never ridden there but its a good bet i reckon.
You could also try Devils Gully near Kersbrook and Bennetts near Chain of Ponds
This link has a map showing the locations.
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