Cycling and mountainbiking in Perth

Dear Internations Members,

Are you into cycling, triathlons or mountainbiking? How do you find these sports in Perth? Where do riders normaly go training?

I´m looking for places where I could go for a safe, uninterrupted ride at training speeds ( Protected content ), without having to watch for traffic, parked cars and pedestrians.

I know that there are some bike trails along the Swan River. I also know there´s some good riding around Helena Valley / Mundaring Weir (Bibbulmun Track). What other places do you know? What are your favourites?

Is it possible to have a good / safe / fast training ride not too far away from Kings Park / UWA Campus area or is that rather impossible?

Many Thanks,
Jim